Dp Slave Diagnostics - Siemens SIMATIC ET 200SP Manual

Diagnostics, error and system alarms

5.2 DP slave diagnostics

5.2 DP slave diagnostics
DP V1 slave: Diagnostic interrupt
Transmission of diagnostic data is made as a diagnostic interrupt. Diagnostic interrupts must
be acknowledged by the DP master.
Supported diagnostic functions
The CM DP supports the following blocks of the DP diagnostics:
● Standard diagnostics (6 bytes)
● Identifier-related diagnostics (2...17 bytes depending on the number of configured transfer
areas)
● Module status (5...35 bytes depending on the number of configured transfer areas)
● Diagnostic interrupt (8 bytes, if any)
User program (DP master)
The "DPNRM_DG" instruction is used to read the diagnostic data of a DP slave (DP single
diagnostics) in the DP master.
The diagnostic interrupts for DP V1 slaves are periodically evaluated in the user program of
the master via the "RALRM" instruction.
You can find the required parameter assignment for the instruction in the STEP 7 online
help.
The following is a structural overview of the diagnostic data.
Overview of standard diagnostics
18
Byte
0
1
2
3
4...5
Standard diagnostics
Meaning
Station status 1
Station status 2
Station status 3
Master address
Manufacturer ID of the slave
Communication module CM DP (6ES7545-5DA00-0AB0)
Manual, 12/2014, A5E33619758-AB