Siemens SIMATIC TI500 - Command 66 - Read K Memory; Command 67 - Read WY Memory; C-33 Command 66 - Request; C-34 Command 66 - Response

Modbus Commands
C-27
TIWAY I Gateway User Manual
This command permits the collection of constant (K) memory . The formats of
the command and response are as follows.
I000000
Request: aa 42 llll nnnn XXXX
Checksum (XXXX)
Number of locations to collect (nnnn)
Starting location to collect from (llll)
Command 66 (42 hex)
Address (aa)
Figur e C-33 Command 66 — Request
I000000
Response: aa 42 bb dddd . . . XXXX
Checksum (XXXX)
K-memory data
Number of data bytes to follow (bb)
Command 66 (42 hex)
PLC TIWAY network address (aa)
Figur e C-34 Command 66 — Response
This command permits the collection of W ord Output memory . The formats
of the command and response are as follows.
I000000
Request: aa 43 llll nnnn XXXX
Checksum (XXXX)
Number of locations to collect (nnnn)
Starting location to collect from (llll)
Command 67 (43 hex)
Address (aa)
Figur e C-35 Command 67 — Request
I000000
Response: aa 43 bb dddd . . . XXXX
Checksum (XXXX)
WY memory data
Number of data bytes to follow (bb)
Command 67 (43 hex)
PLC TIWAY network address (aa)
Figur e C-36 Command 67 — Response
Command 66 —
Read K Memory
Command 67 —
Read WY Memory