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Monday, March 18, 2019
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Modbus I/Os Read/Write from Micro850
How to relate a Tag in CCW to a Modbus register


I'm using Allen Bradley Micro850 - 2080-LC50-24QWB PLC. I downloaded a program to that PLC by CCW.

My customer wants to build an application (like a GUI) on a PC which ables to read and write the I/Os. Therefore he needs me to send him the registers of the I/Os that i have used in the program.

So I would like to know the register for every tag or I/O. Where can i get that information from?

For example, I would like to read: _IO_EM_DI_00. How could i know what this tag's Modbus register is?

thanks in advance.

The tags don't have a Modbus register because they aren't Modbus. They have to be mapped.

Under the Micro850 Tab > Controller > Modbus Mapping

Variable Name Data Type Address Addresses Used
_IO_EM_DI_00 BOOL 000001 000001