Wyatt (Customer) asked a question.
I am new to modbus addressing and communication. I am using a CLICK C0-10ARE and have been asked for the modbus register map. Does this just get set up using the SEND and RECIEVE commands in the PLC software?
The way I somewhat understand it is that you pick your CLICK addresses and tell them which MODBUS addresses you want them to coincide with. Any and all information is welcome including a good place to look for knowledge on this type of communication.
Hi Wyatt,
If you look at the address picker and turn on the show Modbus addresses.
Regards,
Garry
https://accautomation.ca/series/click-plc/
Thank you Garry. Both of these were a big help.
No problem Wyatt.
The one thing that is sometimes confusing is the terminology with Modbus.
Modbus is a master/slave type of protocol. The slave will not do anything until the master instructs the slave.
Modbus TCP is an Ethernet Connection - The master is also called a Client and the slave is called a Server. Multiple masters are possible on this network.
Modbus RTU or Modbus ASCII is a serial connection. (RS232, RS485, etc.) You can have only one master on this network.
Here is a good video explaining the actual information being passed on this protocol.
https://www.youtube.com/watch?v=OvRD2UvrHjE
Let me know if you have any questions.
Garry
Here is an example that will show you Modbus TCP communication using AdvancedHMI.
https://accautomation.ca/click-plc-advancedhmi-communication/
Regards,
Garry