Siemens SIMATIC TI500 - User-Defined Modbus Commands; Command 65 - Read C Memory; C-31 Command 65 - Request; C-32 Command 65 - Response

Modbus Commands
C-26
TIWAY I Gateway User Manual
C.3 User-Defined Modbus Commands
There are three user -defined commands implemented in the TIW AY I
Gateway
. These commands, described below , allow the Gateway to work
with the IDT operator interface family of products.
This command permits the collection of Control Relay (C) data. The format
of the command is as follows.
I000000
Request: aa 41 llll nnnn XXXX
Checksum (XXXX)
Number of points to collect (nnnn)
Starting point to collect from (llll)
Command 65 (41 hex)
Address (aa)
Figur e C-31 Command 65 — Request
The response for this command is as follows.
I000000
Response: aa 41 bb dd dd . . . XXXX
Checksum (XXXX)
C data: 0 – of f, 1 – on
Number of data bytes to follow (bb)
Command 65 (41 hex)
PLC TIWAY network address (aa)
Figur e C-32 Command 65 — Response
Command 65 —
Read C Memory