Interrupts, error messages, diagnostics and system alarms
5.3 Alarms
Interface module IM 155-6 DP HF (6ES7155-6BA01-0CN0)
Manual, 10/2018, A5E03916550-AD
39
Alarms
Actions after a diagnostics alarm in DPV1 mode
The error is entered in the channel diagnostics in the diagnostics frame:
● In DPV1 mode, diagnostics can be reported as diagnostic interrupts.
● After a diagnostics alarm, this is
– entered in the diagnostics frame as diagnostic interrupt block (always for one interrupt
only).
– Stored in the diagnostics buffer of the CPU.
● The ERROR LED of the interface module flashes.
● OB 82 is called. If OB 82 does not exist, the CPU changes to STOP mode.
● Acknowledgment of diagnostic interrupt (a new interrupt is then possible)
Length of the diagnostics frame
● The maximum frame length for the ET 200SP distributed I/O system with IM155-6 DP HF
interface module (DPV1 mode) is 244 bytes.
● The minimum frame length is 6 bytes.
Reading out the diagnostics data
Table 5- 6 Reading out the diagnostics data with STEP 7
Automation system
with DP master
SIMATIC S7/M7 Slave diagnostics data as plain text in
the "DP slave diagnostics" tab in the
"Diagnosing hardware" in the STEP 7
online help
Instruction "DP NRM_DG" (SFC 13)
Reading out slave diagnostics (store
in the data area of the user program)
SFC, see STEP 7 online help
Instruction "RD_REC" (SFC 59)
Reading out data records of the S7
diagnostics data (store in the data
area of the user program)
See System and Standard Functions
reference manual
Instruction "RDREC" (SFB 52)
Reading data records from the DP
SFB, see STEP 7 online help (system
functions/function blocks)
Instruction "RALRM" (SFB 54)
Receiving interrupts from the interrupt
SFB, see STEP 7 online help (system
functions/function blocks)