Interrupts, error messages, diagnostics and system alarms
5.3 Alarms
Interface module IM 157-1 DP (6ES7157-1AA00-0AB0)
Manual, 12/2016, A5E32100641-AD
35
Diagnostics 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 diagnostics interrupts.
● After a diagnostics alarm, this is
– entered in the diagnostics frame as a diagnostics interrupt block (always only one
interrupt).
– Stored in the diagnostics buffer of the CPU.
● The ERROR LED of the interface module flashes.
● OB 82 is called. If OB 82 is not available, the CPU goes into STOP mode.
● Acknowledgment of the diagnostics interrupt (a new interrupt is possible thereafter).
Length of the diagnostics frame
● The maximum frame length for the ET 200AL distributed I/O system with IM157-1 DP
interface module (DPV1 mode) is 244 bytes.
● The minimum frame length is 6 bytes.
Reading out the diagnostics data
Table 5- 4 Reading the diagnostics with STEP 7
Automation system
with DP master
SIMATIC S7/M7 Slave diagnostics in plain text in "DP
Slave Diagnostics" tab on STEP 7
"Hardware diagnostics" in STEP 7
online help
"DP NRM_DG" instruction (SFC 13)
Reading out slave diagnostics (store
in the data area of the user program)
SFC: see STEP 7 online help
"RD_REC" instruction (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
"RDREC" instruction (SFC 52)
Reading data records from the DP
SFB: refer to STEP 7 online help (sys-
tem functions/function blocks)
"RALRM" instruction (SFC 54)
Receiving interrupts from the interrupt
SFB: refer to STEP 7 online help (sys-
tem functions/function blocks)
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