I used this exact AOI several months back to read PV and SV temperature and status info from a Honeywell controller. Only issue I had was I was doing this from 1 PLC and reading 4 different Honeywell controllers. It worked great for the first couple controllers but as I added more controllers the transaction status had issues and would lock up. I had to cycle through each transaction using a timer to "step" through the transactions in sequence. Turning the enable bit for each transaction on until it was successful or failed then back off then moved to the next transaction.
Great timing on this video. I just got into a chiller running AB hardware a couple of days ago to put in data logging, and turning it into a Modbus server made my life so much easier. Thanks.
This video is extremely helpful. I have a ModMAG Badger Flow Meter which uses ModBus that I need a CompactLogix to communicate with. Wasn't sure how I was going to do it until finding this video. Thank you!
Fantastic Video!! I used this AOI to bring in data from a GE PQMII Power Meter with GE Multinet RS-485 to Modbus TCP converter. I could easily use GE's Enervista software to monitor the power meter data, but I wanted to see if I could bring at least a few data points into the Compactlogix PLC to be able to send back out either Ethernet IP to another PLC or monitor locally via HMI. The challenging part is that I had to set my begin address in the right spot in order to get the data that I wanted, which I figured out from the memory register map provided by GE. The serial converter could only bring in 120 registers. I ended up setting two different transactions, bringing in a set of 120 registers to the 3xxx input registers, and a second transaction for bringing in 120 more registers and mapping them to the 4xxx holding registers. I'm sure there's a better way, but with the time I had I was able to get it to work! I sure appreciate you putting this together!
Hi Tim, In the manual it states: If you change any of these Parameters during operation be sure to reset and then set the AOI Inp_Enable parameter tag. How do you reset? I am having a problem with connecting to the other PLC. Thanks, Jim
@@TimWilborne The Micro820 is even cheaper then some of the standalone protocol convertors. Though you will spend more time the first time setting up the code.
Hi Tim, I have a compactlogix L33ER communicating to Modbus TCP Gateway . Modbus TCP Gateway is connected to Modbus Serial Devices with different Salve ID. Can I read specific Slave from this AOI? Does it mean I have to Specify Station ID = slave ID on those devices?
We have controller 10.10.1.50 Also analyzer 10.10.1.70 Kindly clear me , We should use Client AIO in plc logic ? And deatiny ip i.e analyzer 10.10.1.70 ?
Hi Tim Hope your Doing Good What would be the Poll interval if i dont use a 10ms task what if i use 400ms perodic Task then how to calculate the poll interval?
Hi Tim, I used the Modbus AOI, But we have some Overlap and overload Issue. I tried all potential troubleshoot methods, Can you suggest any troubleshooting method
Is there a way to automatically “map” controller tags to modbus output/input addresses in Studio 5000? For example I have 30 user defined tags, and i just want to automatically map them from modbus address coils xxx[0] to [29] via the AOI instead of going through them one by one
Thanks much, Tim!! We really appreciate and enjoy your videos a lot. We are thinking of maybe sponsoring your channel, please let us know how do we proceed. Thanks!
We don't accept sponsors on our main channel, the only way to get mentioned on it is to convince us to use your products, but our 2nd channel does highlight products that we find helpful. twcontrols.com/product-sponsorships
Hi, very good tutorial! Can I do this Modbus TCP Client communication using the same physical port that already communicates with a 1734-AENT Ethernet/IP remote? Both the EtherNet/IP remote and the Modbus TCP equipment are in the same IP range.
Hi I was looking your movie several times because im having a challange with my simulated 1756-L81E PLC. Do you know if its possible to use Modbus TCP Server on a 1756-L81E? Thanks
@@TimWilborne greatfull for your very quick answer but i do exacly the same but keep do the failur status error code -8 by the way enjoying your videos :)
@@TimWilborne error code -8 "Create Socket Message failed". If i look under the MSG_Create it says Error code 16#0005 and Error Text: Class or instance not supported. I guess it means that rockwells echo 1756-L81E do not support this library? Thank you for taking time to answer my questions
That sounds more like a path problem. I'm using this instruction on an L81E in our training center. Double check those initial settings in the user guide
The documentation on this AOI is well written and usually spot on, here is an excerpt from the manual. You likely need to increase your polling rate. If selected PollInterval settings are marginally too fast you will likely see occasional Sts_Overlap errors and your system should work reasonably well. If selected PollInterval settings are extremely out of line, you will see both Sts_Overlap and Sts_Overload errors and your system will not work reliably. If you are getting Sts_Overload errors, you must adjust your PollInterval settings.
Is this AOI available for ControlLogix PLC's? I usually use a RedLion DSPLE for any type of protocol converting, but if I have just a few TCP devices and can get away with just using an AOI then I would be happy to save the customer 1 to 2k.
@TimWilborne Gotcha. Reason why I wasn't sure about the control logix is because they don't have an embedded ethernet like the compacts, well at least anything below an L81 doesn't, but because they use ethernet cards and there's different variations and models of ethernet cards for control logix processors, I thought it might of not been supported or at least had a different AOI for each different model and revision of ethernet cards, but if that's not the case then awesome! I'm assuming though in the control logix AOI you'd have to point it at the ethernet card itself so it can identify what slot and what it's on. I guess if there was a different ethernet card the AOI might have logic and does a GSV to identify which type of card it is then executes accordingly based on that. I did know that regarding the Micro 800's. I've used them for small jobs before to monitor some modbus values last one was on an on a HVAC system, controlling the humidity and temperature of a room where they have thermoforming for composite papermilling where they make like paper plates, bowls, to go boxes, and etc. The smallest change in temperature and humidity can mess up their product. Actually I did their whole DCS and SCADA system 4 years ago and now they're expanding investing 340 million and I'm involved again we're just finishing up Phase 1 now which added several hundred of new I/O points by itself we called it project WildCat because of how crazy and fast pace it was moving now we're about to start Phase 2 and 3 which we're calling this Phase project Hiawassee and the original DCS (1756-L84E) is nearly full capacity wise it's getting close to 90%, so in the panels that are being built in our panel shop right now for Hiawassee we will have four 1756-L84E's. They will be redundant pairs. Then building bunch of RIO panels. Which when we did the original start up 4 years ago and they bought this old plant to convert it over to a papermill they made us reuse all the original RIO cabinets and they were all Siemens profibus, so we had to use a Prosoft card to communicate to thousands of IO points, but being that this will be all new equipment and they're not being stingy on cost we're building it right we'll have everything on a redundant DLR all with stratix switches and AB VFD's and E300's and we took PlantPAX made changes to where it's better. Especially with the motors and valves we made it to where a VSD control module (AOI) will work with any type of motor by just turning a bit on or off telling it that if it has speed feedback then the VSD will work to control VFD's and if that bit is off then it'll work as a hard wired motor either with a E300 or just plain IO. Then samething with the valves if they're control variable valves or just on a simple solenoid. Even with P_AI we have it to where it'll work with any kind of PV, ethernet, analog. We added so many nice features to the plantpax faceplate themselves that if they were to swap a motor to a VFD all the operator has to do is flip a bit and select VFD type PowerFlex 525, 400, 7xx, Siemens, Lenza, etc and it will do everything they need it too. There's too many features we added and made PlantPax much better to name off here, but after we did that for this project since things were constantly changing and operators can't program and as integrators we can't always be onsite or remote in, that they can do a lot of it without our help, that it changed the standard for us. Some of the features my colleague developed into it, Rockwell is supposedly going to implement some of them theirselves. Latest thing I added was a little area to keep track of loopchecks while we did this startup for WildCat if you punch in a date of when it was loopchecked then this little red symbol that says "LC" like this (without the cigarette) and the letters 'LC' 🚭 saying that it hasn't been loop checked, disappears when the date of completion is punched in on the faceplate. Then we added maintenance notes if it's being worked on then something similar will pop up saying it's locked out or being worked on. There's bunch of other features I'd love to ramble on about that I'm proud of, but this has probably been my most favorite project that I've done in several years. Since I've started with this company and do more Plant stuff then I do with machinery and robotics. I do miss working with robots.
You specify the IP address and the slot, so the processor and Ethernet port do not have to be the same. It is a well written AOI. That L84E is a beast, that is a big system if you need 4 of them. Good luck on project Wildcat!
Im using a control logix, I already followed all the steps for the modbus tcp client, now will my pv800 be the client? Do I still have to add the IP address,1,0.?
@@TimWilborne yes I can switch it so it can be a server . Just can't figure out if I have to set the pv800 differently other than modbus. I have pv800 ver 8,and ccw ver 22..
I know it says ControlLogix in the title of the video. I just want to 100% confirm. Can a ControlLogix PLC utilize this ModbusTCP AOI? My application is not using a Compactlogix.
TIm, great video ! I need to bring in a float value from a device via MB. The device is the server according to your great explanation and is outputting a float value to 400100. Do you know if this AOI will convert MB data to float in Compact Logix ?
@@TimWilborne For example, if my MB values are: 0000 F641 (depending on Byte order), I will bring that in to my Compact Logix as 0 and 63041 (converting F641 to decimal). I need the actual floating point decimal value, which in this case is 30.75. Will the AOI do that conversion or will need additional programming to do this? I think a Red Lion Converter will do this for me but if the AOI can do it I can eliminate one piece of hardware.
@@lindadeutsch5810 If it looks strange when it comes it, that is where you swap bytes and words. Chances are that will be the culprit. I should do a video on that.
@@TimWilborne I looked into the AOI documentation and I don’t see a way to bring a MB value in that is formatted as float. I think it will bring in the data but it must be converted to decimal format using some other method. Yes, byte order is critical. Thanks for taking the time to reply and thanks for the great videos!
We have had success taking the float value, multiplying by 100, for 2 decimal places to create a REAL and on then on receiving end, Taking that REAL value and then dividing by 100. What you multiply by depends on how many decimal places you need. 10=1dp, 100=2dp, 1000=3dp, etc...…
My Plc Compact logic. And two rap system device IP address 192.168.1.250 and 251. Every device 14 Level transmitter connect. I setup to modbus client aio. And setup ip and address. But Program data overlap. Any suggestion.
Great Videos Tim! I am impressed. I have the same question, how do I map an Analog Input through the Modbus. I am currently reading multiple analogs into my CLX. Now I need to map one of them to a local device (a Jumo Logoscreen FD chart recorder to be specific) through modbus. In the video I only saw you working with INT's, I will need a Real or a Float.
@@TimWilborne Hi Tim , thanks for your reply. This was my requirement as if i was writing the registers continuously my device was not functioning. So according to supplier , it has to be written on “state change” only. I did this by enabling the transaction enable bit for 1 sec whenever there is change in state of my boolean variable
This is two years late, but usually floats will just take up adjacent registers. You can also just convert it to an INT. Just multiply it by 10 or 100 to keep 1 or 2 decimal places.
Use the COP instruction and copy the real to the INT that you're sending over modbus with a length of two. That'll copy 32 bits. Then do the opposite on the other side. You may need this video to rearrange your data when it comes through. th-cam.com/video/o3OWV8Q_U7s/w-d-xo.html
I used this exact AOI several months back to read PV and SV temperature and status info from a Honeywell controller. Only issue I had was I was doing this from 1 PLC and reading 4 different Honeywell controllers. It worked great for the first couple controllers but as I added more controllers the transaction status had issues and would lock up. I had to cycle through each transaction using a timer to "step" through the transactions in sequence. Turning the enable bit for each transaction on until it was successful or failed then back off then moved to the next transaction.
Great timing on this video. I just got into a chiller running AB hardware a couple of days ago to put in data logging, and turning it into a Modbus server made my life so much easier. Thanks.
Good to hear. It is very easy to use!
This video is extremely helpful. I have a ModMAG Badger Flow Meter which uses ModBus that I need a CompactLogix to communicate with. Wasn't sure how I was going to do it until finding this video. Thank you!
You are welcome!
This was very helpful in understanding the set up parameters. It helped me write form a CompactLogix to a SCADPack. Thank you!
Glad it helped Douglas!
Fantastic Video!! I used this AOI to bring in data from a GE PQMII Power Meter with GE Multinet RS-485 to Modbus TCP converter. I could easily use GE's Enervista software to monitor the power meter data, but I wanted to see if I could bring at least a few data points into the Compactlogix PLC to be able to send back out either Ethernet IP to another PLC or monitor locally via HMI. The challenging part is that I had to set my begin address in the right spot in order to get the data that I wanted, which I figured out from the memory register map provided by GE. The serial converter could only bring in 120 registers. I ended up setting two different transactions, bringing in a set of 120 registers to the 3xxx input registers, and a second transaction for bringing in 120 more registers and mapping them to the 4xxx holding registers. I'm sure there's a better way, but with the time I had I was able to get it to work! I sure appreciate you putting this together!
I agree. There is some good software out there but sometimes I just need to grab a few points and send them on.
Hi Tim,
In the manual it states: If you change any of these Parameters during operation be sure to reset and then set the AOI Inp_Enable parameter tag.
How do you reset? I am having a problem with connecting to the other PLC.
Thanks,
Jim
Set it to 0 then back to 1.
Thanks Tim!@@TimWilborne
You are welcome.
Thanks sir for this Modbus TCP client tutorial..
You are most welcome
Thanks again, Tim! Great tutorial on Modbus TCP. You have a great channel.
Thanks a lot. I appreciate that!
The 5380 has Modbus RTU as well if you get the 5069 serial module. Supports DF1 too. That 5380 series has been quite a problem solver.
Sometimes I'll use a Micro820 just as a Modbus RTU to Ethernet bridge. Haven't used the 5069 serial module.
@@TimWilborne The Micro820 is even cheaper then some of the standalone protocol convertors. Though you will spend more time the first time setting up the code.
Thank you, very helpfull, worth the watch
Glad you found it useful.
Thanks Tim! This was a helpful demo
Glad it was helpful!
We will try to use this for connection to Ingersoll Rand compressor controllers.
Great. I have used it several times now with good results
Hi Tim. Your videos have been very helpful to my learning.
Can I know if I use HMI with PLC using modbus TCP, do I use PLC as a client or server?
For most HMIs, they operate as a client, reading data stored elsewhere so you PLC would be a server.
Hi Tim, I have a compactlogix L33ER communicating to Modbus TCP Gateway .
Modbus TCP Gateway is connected to Modbus Serial Devices with different Salve ID. Can I read specific Slave from this AOI? Does it mean I have to Specify Station ID = slave ID on those devices?
I'm not sure, I've never tried bridging it to a RTU network
We have controller 10.10.1.50
Also analyzer 10.10.1.70
Kindly clear me , We should use Client AIO in plc logic ? And deatiny ip i.e analyzer 10.10.1.70 ?
Hi Tim Hope your Doing Good
What would be the Poll interval if i dont use a 10ms task what if i use 400ms perodic Task then how to calculate the poll interval?
It would still be based on the individual transaction polls but additionally, only when divisible by 400.
you´re the best!!
Thanks 😊
Hi Tim, I used the Modbus AOI, But we have some Overlap and overload Issue. I tried all potential troubleshoot methods, Can you suggest any troubleshooting method
Check the data types when you are specifying the lengths.
Thanks for the video Tim, i think i'm on the right track but the TransStat reads (-1 = exception) do you know what this means?
just shared this with a teammate that is looking for this info.
Glad I could help out.
Is there a way to automatically “map” controller tags to modbus output/input addresses in Studio 5000? For example I have 30 user defined tags, and i just want to automatically map them from modbus address coils xxx[0] to [29] via the AOI instead of going through them one by one
If the data you want in the Modbus registers is in a consecutive order then you could use the CPS instruction.
Very nice and helpful...thanks
You are welcome 😁
Thanks much, Tim!! We really appreciate and enjoy your videos a lot. We are thinking of maybe sponsoring your channel, please let us know how do we proceed. Thanks!
We don't accept sponsors on our main channel, the only way to get mentioned on it is to convince us to use your products, but our 2nd channel does highlight products that we find helpful.
twcontrols.com/product-sponsorships
Hi, very good tutorial! Can I do this Modbus TCP Client communication using the same physical port that already communicates with a 1734-AENT Ethernet/IP remote? Both the EtherNet/IP remote and the Modbus TCP equipment are in the same IP range.
Yes!
Nice stuff, Tim!
Thanks!
Any recommendations for an L61 running v16? I also have some 1400s running v17.
You got me, how did you get a 1400 to run in Studio 5000?
Hi I was looking your movie several times because im having a challange with my simulated 1756-L81E PLC. Do you know if its possible to use Modbus TCP Server on a 1756-L81E? Thanks
Yes, see if this video helps
th-cam.com/video/qcF4m7rPjkw/w-d-xo.html
@@TimWilborne greatfull for your very quick answer but i do exacly the same but keep do the failur status error code -8
by the way enjoying your videos :)
What is error code 8 when you look in the documentation?
@@TimWilborne error code -8 "Create Socket Message failed". If i look under the MSG_Create it says Error code 16#0005 and Error Text: Class or instance not supported. I guess it means that rockwells echo 1756-L81E do not support this library? Thank you for taking time to answer my questions
That sounds more like a path problem. I'm using this instruction on an L81E in our training center. Double check those initial settings in the user guide
Have anyone recently download the add on? I can´t find it in the Rockwell Page
Try the following link
controls.tw/yt-modbus-aoi
can you put that procedure doc youre reading off of in the description please?
It is in the package you download from Rockwell's sample programs for the AOI
@@TimWilborne Ahhh yes thank you
You are welcome
My Sts_Overload bit is enabled and im not sure on how to fix it. Do you know what this means and any ideas for me to try?
The documentation on this AOI is well written and usually spot on, here is an excerpt from the manual. You likely need to increase your polling rate.
If selected PollInterval settings are marginally too fast you will likely see occasional Sts_Overlap errors
and your system should work reasonably well.
If selected PollInterval settings are extremely out of line, you will see both Sts_Overlap and
Sts_Overload errors and your system will not work reliably. If you are getting Sts_Overload errors, you
must adjust your PollInterval settings.
Is this AOI available for ControlLogix PLC's? I usually use a RedLion DSPLE for any type of protocol converting, but if I have just a few TCP devices and can get away with just using an AOI then I would be happy to save the customer 1 to 2k.
It works with all Studio 5000 PLCs including the Compactlogix. Also, the Micro800s do Modbus TCP and RTU natively and can act as a bridge.
@TimWilborne Gotcha. Reason why I wasn't sure about the control logix is because they don't have an embedded ethernet like the compacts, well at least anything below an L81 doesn't, but because they use ethernet cards and there's different variations and models of ethernet cards for control logix processors, I thought it might of not been supported or at least had a different AOI for each different model and revision of ethernet cards, but if that's not the case then awesome! I'm assuming though in the control logix AOI you'd have to point it at the ethernet card itself so it can identify what slot and what it's on. I guess if there was a different ethernet card the AOI might have logic and does a GSV to identify which type of card it is then executes accordingly based on that. I did know that regarding the Micro 800's. I've used them for small jobs before to monitor some modbus values last one was on an on a HVAC system, controlling the humidity and temperature of a room where they have thermoforming for composite papermilling where they make like paper plates, bowls, to go boxes, and etc. The smallest change in temperature and humidity can mess up their product. Actually I did their whole DCS and SCADA system 4 years ago and now they're expanding investing 340 million and I'm involved again we're just finishing up Phase 1 now which added several hundred of new I/O points by itself we called it project WildCat because of how crazy and fast pace it was moving now we're about to start Phase 2 and 3 which we're calling this Phase project Hiawassee and the original DCS (1756-L84E) is nearly full capacity wise it's getting close to 90%, so in the panels that are being built in our panel shop right now for Hiawassee we will have four 1756-L84E's. They will be redundant pairs. Then building bunch of RIO panels. Which when we did the original start up 4 years ago and they bought this old plant to convert it over to a papermill they made us reuse all the original RIO cabinets and they were all Siemens profibus, so we had to use a Prosoft card to communicate to thousands of IO points, but being that this will be all new equipment and they're not being stingy on cost we're building it right we'll have everything on a redundant DLR all with stratix switches and AB VFD's and E300's and we took PlantPAX made changes to where it's better. Especially with the motors and valves we made it to where a VSD control module (AOI) will work with any type of motor by just turning a bit on or off telling it that if it has speed feedback then the VSD will work to control VFD's and if that bit is off then it'll work as a hard wired motor either with a E300 or just plain IO. Then samething with the valves if they're control variable valves or just on a simple solenoid. Even with P_AI we have it to where it'll work with any kind of PV, ethernet, analog. We added so many nice features to the plantpax faceplate themselves that if they were to swap a motor to a VFD all the operator has to do is flip a bit and select VFD type PowerFlex 525, 400, 7xx, Siemens, Lenza, etc and it will do everything they need it too. There's too many features we added and made PlantPax much better to name off here, but after we did that for this project since things were constantly changing and operators can't program and as integrators we can't always be onsite or remote in, that they can do a lot of it without our help, that it changed the standard for us. Some of the features my colleague developed into it, Rockwell is supposedly going to implement some of them theirselves. Latest thing I added was a little area to keep track of loopchecks while we did this startup for WildCat if you punch in a date of when it was loopchecked then this little red symbol that says "LC" like this (without the cigarette) and the letters 'LC' 🚭 saying that it hasn't been loop checked, disappears when the date of completion is punched in on the faceplate. Then we added maintenance notes if it's being worked on then something similar will pop up saying it's locked out or being worked on. There's bunch of other features I'd love to ramble on about that I'm proud of, but this has probably been my most favorite project that I've done in several years. Since I've started with this company and do more Plant stuff then I do with machinery and robotics. I do miss working with robots.
You specify the IP address and the slot, so the processor and Ethernet port do not have to be the same. It is a well written AOI.
That L84E is a beast, that is a big system if you need 4 of them. Good luck on project Wildcat!
Is it possible to use it in redundant equipment (Contrologix hotstandby)?
No, not Modbus
Im using a control logix, I already followed all the steps for the modbus tcp client, now will my pv800 be the client? Do I still have to add the IP address,1,0.?
It would be the opposite but can the Panelview 800 be a Modbus server? I should play with modbus on the Panelview 800 sometime.
@@TimWilborne yes I can switch it so it can be a server . Just can't figure out if I have to set the pv800 differently other than modbus. I have pv800 ver 8,and ccw ver 22..
Good to know, I didn't realize you could make the Panelview 800 a Modbus server. I'll have to look at it some time.
I know it says ControlLogix in the title of the video. I just want to 100% confirm.
Can a ControlLogix PLC utilize this ModbusTCP AOI? My application is not using a Compactlogix.
Yes, just set up a Controllogix using it at the training center today.
Show error overlap how to resolve
How to increase no of transaction
Where's the link to the AOI download?
Google Rockwell Sample Downloads
TIm, great video ! I need to bring in a float value from a device via MB. The device is the server according to your great explanation and is outputting a float value to 400100. Do you know if this AOI will convert MB data to float in Compact Logix ?
Hi Linda, you'll have to break it into two consecutive blocks.
@@TimWilborne For example, if my MB values are: 0000 F641 (depending on Byte order), I will bring that in to my Compact Logix as 0 and 63041 (converting F641 to decimal). I need the actual floating point decimal value, which in this case is 30.75. Will the AOI do that conversion or will need additional programming to do this? I think a Red Lion Converter will do this for me but if the AOI can do it I can eliminate one piece of hardware.
@@lindadeutsch5810 If it looks strange when it comes it, that is where you swap bytes and words. Chances are that will be the culprit. I should do a video on that.
@@TimWilborne I looked into the AOI documentation and I don’t see a way to bring a MB value in that is formatted as float. I think it will bring in the data but it must be converted to decimal format using some other method. Yes, byte order is critical. Thanks for taking the time to reply and thanks for the great videos!
We have had success taking the float value, multiplying by 100, for 2 decimal places to create a REAL and on then on receiving end, Taking that REAL value and then dividing by 100.
What you multiply by depends on how many decimal places you need. 10=1dp, 100=2dp, 1000=3dp, etc...…
My Plc Compact logic. And two rap system device IP address 192.168.1.250 and 251. Every device 14 Level transmitter connect. I setup to modbus client aio. And setup ip and address. But Program data overlap. Any suggestion.
How to map the signal comes into compact logix to perticuler tag
Great Videos Tim! I am impressed. I have the same question, how do I map an Analog Input through the Modbus. I am currently reading multiple analogs into my CLX. Now I need to map one of them to a local device (a Jumo Logoscreen FD chart recorder to be specific) through modbus. In the video I only saw you working with INT's, I will need a Real or a Float.
can we generate polling only on " when there is a change in state" ?
Maybe on blocks you are writing to but it would be crude, not like you can with produced and consumed tags
@@TimWilborne Hi Tim , thanks for your reply. This was my requirement as if i was writing the registers continuously my device was not functioning. So according to supplier , it has to be written on “state change” only. I did this by enabling the transaction enable bit for 1 sec whenever there is change in state of my boolean variable
Great!
thanks very much
You're welcome!
How send float value to clinet modbus TCP ip device, because in this AOI there is only INT option and chiller recirve only float value how to set?
This is two years late, but usually floats will just take up adjacent registers. You can also just convert it to an INT. Just multiply it by 10 or 100 to keep 1 or 2 decimal places.
How can i read and write 32 bit real value?
Use the COP instruction and copy the real to the INT that you're sending over modbus with a length of two. That'll copy 32 bits. Then do the opposite on the other side. You may need this video to rearrange your data when it comes through.
th-cam.com/video/o3OWV8Q_U7s/w-d-xo.html
don't need to use device id? how can i modify?
I'm trying to communicate modbus tcp gateway with the ATV320 SCHNEIDER and using AIO, but it can't exchange data. How can I do it?
@@teixeira3021 you may need to set the node address of the serial device to 0.
Thanks for revealing this "hidden" gem. It's a shame when politics infiltrates automation.