Internet PLC Forum
General => Technical support => Topic started by: vijay on April 19, 2004, 07:34:44 PM
-
I am trying to interface to a Aromat GT-01 touchpanel. This supports MODBUS RTU so the interface should be simple. However the MODBUS mapping makes no sense:
INPUT 100000 to 165520
COILS 000000 to 065520
REGS 400000 to 499999
How does this map to the TD PLC ?
Any help appreciated - Vijay ?
-
There is an updated T100MD+ modbus mapping document that you can download from the following link:
http://www.tri-plc.com/appnotes/modbus-map.pdf
This document provide the mapping of the bit I/Os to the MODBUS bit addresses. However, we treat the MODBUS bit address as from 0 to 2048 range only and we treat all I/O bits the same regardless of whether it is an input, an output, relay, timer or counter bit. Inputs are mapped to bit address 1 to 256. Outputs are mapped to bit addresses 257 to 512, etc.
It seems like the GT-01 panel uses the first digit to represent the I/O type, yet it uses zero offset to represent the bit which is not quite MODBUS like. Anyway, please try the following:
Input 1: 100000
Input 2: 100001
.....
Input 96: 100095
Output 1: 000256
Output 2: 000257
....
Output 96: 000352
Etc.