Siemens SIMATIC ET 200AL - 2 xCount Parameters and Address Space; General Parameters (2 xCount)

Interrupts, error messages, diagnostics and system alarms
5.3 Alarms
IM 157-1 DP (6ES7157-1AA00-0AB0)
Equipment Manual, 08/2021, A5E32100641-AE
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5.3.2 Slave diagnostics
The figure below shows the structure of the slave diagnostics.
Figure 5-11 Structure of the slave diagnostics
Note
The length of the diagnostics frame varies with the IM
157-1 DP (depending on parameter
assignment) between 6 and 244
bytes in DPV1 mode.
You can identify the length of the last received dia
gnostics frame in STEP
7 from the RET_VAL
parameter in SFC 13.