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

C.3

User-Defined Modbus Commands

Command 65 —
Read C Memory
C-26 Modbus Commands
There are three user-defined commands implemented in the TIWAY 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.
Request: aa 41 llll nnnn XXXX
Figure C-31 Command 65 — Request
The response for this command is as follows.
Response: aa 41 bb dd dd . . . XXXX
Figure C-32 Command 65 — Response
Checksum (XXXX)
Number of points to collect (nnnn)
Starting point to collect from (llll)
Command 65 (41 hex)
Address (aa)
Checksum (XXXX)
C data: 0 – off, 1 – on
Number of data bytes to follow (bb)
Command 65 (41 hex)
PLC TIWAY network address (aa)
TIWAY I Gateway User Manual
I000000
I000000