Allen Bradley Micro850 Modbus RTU Master RS-485
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- เผยแพร่เมื่อ 26 ก.ค. 2024
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MSG_MODBUS / READ/WRITE Instruction
Baud: 19200
Parity: None
Stop Bits: 1
Master: Micro850 2080-LC50-24QWB
Slave: Micro820 2080-LC20-20AWB
Slave ID: 123
@0:30 - @0:59 Master PLC round port pinout.
@1:04 - @1:18 Cable and Cable pinout for interconnection between Master and Slave PLC.
@4:04 - @5:25 AND @9:11 - @9:35 Explanation of MSG_MODBUS instruction in the Help menu.
@5:27 - @6:01 Configurations for Master PLC Micro850.
@6:03 - @7:46 Configurations for MSG_MODBUS instruction to READ data from the SLAVE PLC.
@9:38 - @11:00 Configurations for MSG_MODBUS instruction to WRITE data to the SLAVE PLC.
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Make a video showing how to use in real scenario, for example if a push button it pressed on the master, it will make a light on the slave turn on
@6047jacob: what you are looking to do is to map PLC internal registers/tags to actual IO. You can learn how to do it from other channels. My channel is for a bit more advanced audience. My videos are always about working with the logic and PLC internal registers/tags. Thank you for your comments.
@5:15 The tags inside PLC is automatically link to modbus address? Or we need to link the tags to modbus address?
@user-hf1wj8bl9x: Thank you for your comments. It is a bit unclear because I am trying to deliver a lot of information in the video. HDR 40001 to HDR 40003 on the left are Modbus Holding Registers sent from the slave to the master PLC. READ_LA[1] to READ_LA[20] are the master PLC's tags to store data received from the slave PLC. A short answer for your question is NO. You have to configure it in the MSG_MODBUS instruction block later in the video. Please be more patient and watch closely from @6:02to @7:40. It walk you through all the steps you need to take for the required configuration. I think it will add some time marks in the video description to make it a bit clearer. Please let me know if you still have any questions.
I mean, i didn't see how you link the modbus address to the tags, the procedure in short. But as I understand you use modbus message and read/write the array.
@user-hf1wj8b19x: @5:22 and @9:31 the video shows how to map the 2 tag arrays to Modbus Holding Registers with Modbus Message Instruction. Thank you.