Siemens ET 200S Manual page 154

Commissioning and Diagnostics
Note
The length of the diagnostic message frame varies:
S
Between 6 and 43 bytes in the IM151-1 BASIC
S
Between 35 and 64 bytes in the IM151-1 STANDARD and IM151-1 FO
STANDARD
S
Between 6 and 64 bytes in the case of the IM151-1 HIGH FEATURE in DPV0
operation and between 6 and 128 bytes in DPV1 operation (depending on the
parameter assignment).
You can find out the length of the last diagnostic message frame received in:
S
STEP7 from the RET_VAL parameter of SFC13
S
STEP5 from the ERR parameter of FB 192
6-30
Distributed I/O System ET 200S
EWA 4NEB 780 6024-02 07