Siemens S7-1200 PROFIBUS Operating Instructions Manual page 34

Diagnostics and upkeep
5.1 Diagnostics
Bit no. Name
4 Service_Not_Supported
3 Ext_Diag
2 Slave_Config_Check_Fault
1 Station_Not_Ready
0 Station_Non_Existent
Byte 1: Station status 2
Table 5- 4 Structure of station status byte 2
Bit no. Name
7 Deactivated
6 Reserved
5 Sync_Mode
4 Freeze_Mode
3 Watchdog_On
2 Status_From_Slave
1 Static_Diag
0 Parameter_Request
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Explanation
This bit is set by the DP master when the master has requested a function that is
not supported by the DP slave.
Solution: Change the parameter setting to disable the function on the master.
This bit is set by the slave.
• Bit =1: There is diagnostics data in the slave-specific diagnostics area. The
diagnostics data can be evaluated in the user program of the master.
• Bit =0: There may be status information in the slave-specific diagnostics area.
The status information can be evaluated in the user program of the master.
The configuration data sent by the DP master is rejected by the DP slave.
Cause: Configuration error. Solution: Change configuration.
The DP slave is not ready for productive data exchange.
This is a temporary status that cannot be influenced by the DP master.
The DP slave is not reacting on the bus.
This bit is set by the DP master 1 (the slave sets this bit permanently to 0). If the
bit is set, the diagnostic bits have the state of the last diagnostics alarm or the
initial value.
Explanation
The DP slave was identified as being not active in the local parameter record and
it is not polled cyclically.
- reserved -
The DP slave is in SYNC mode. The bit is set by the slave.
The bit is always = 0 on the CM 1242-2 (function not supported).
The DP slave is in FREEZE mode. The bit is set by the slave.
The bit is always = 0 on the CM 1242-2 (function not supported).
Watchdog monitoring is active on the DP slave. The bit is set by the slave.
Bit =1: The diagnostics information comes from the DP slave. The bit is set
permanently to 1 by the slave.
Static diagnostics
If the DP slave sets this bit, the DP master must fetch diagnostics data from the
DP slave until the DP slave resets the bit.
The DP slave sets this bit, for example when it is not capable of data transfer.
The DP slave sets this bit when it needs to have new parameters assigned and be
reconfigured.
If bit 0 and bit 1 are both set, bit 0 has the higher priority.
Operating Instructions, 01/2023, C79000-G8976-C245-06
SIMATIC CM 1242-5