Siemens S7-1200 PROFIBUS - Standard Diagnostics

Diagnostics and upkeep
5.1 Diagnostics
SIMATIC CM 1242-5
Operating Instructions, 01/2023, C79000-G8976-C245-06
33
Overview of device-specific diagnostics
The device-specific diagnostics data depends on the protocol variant operating on the DP
slave:
• DP-V1 slave
Table 5- 1 Overview of device-specific diagnostics of the CM with DP-V1 slaves
Device-specific diagnostics
Byte
Meaning
0
Header
1
Variant
Interrupt type
Variant
Status type
2
Slot number
3 Variant
Interrupt specifier
Variant
Status specifier
4...62
Module-specific diagnostics data
• DP-V0 slave
Table 5- 2 Overview of device-specific diagnostics of the CM with DP-V0 slaves
Device-specific diagnostics
Byte
Meaning
0
Header
1...62
Module-specific diagnostics data
5.1.3 Standard diagnostics
The coding of the standard diagnostics bytes is explained below.
Byte 0: Station status 1
Table 5- 3 Structure of station status byte 1
Bit no.
Name
Explanation
7
Master_Lock
The DP slave was assigned parameters by a different DP master. The DP slave can
only be read by the configured productive DP master.
This bit is set by the DP master when its bus address differs from the configured
address.
6
Parameter_Fault
The last received parameter assignment frame was bad or not permitted. The DP
slave sets this bit.
Solution: Check the parameter settings for illegal parameters.
5
Invalid_Slave_Response
This bit is set by the DP master when no plausible response has been received
from the DP slave.