Standard Diagnostics - Siemens SIMATIC NET CP 1542-5 Equipment Manual

5.1.3

Standard diagnostics

The coding of the standard diagnostics bytes is explained below.
Byte 0: Station status 1
Table 5- 2 Structure of station status byte 1
Bit no. Name
7 Master_Lock
6 Parameter_Fault
5 Invalid_Slave_Response
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- 3 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
SIMATIC CP 1542-5
Equipment Manual, 01/2023, C79000-G8976-C326-05
Explanation
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.
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.
This bit is set by the DP master when no plausible response has been received
from the DP slave.
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 DP slave is in FREEZE mode. The bit is set by the slave.
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.
Diagnostics and maintenance
5.1 Diagnostics
33