Siemens SIMATIC ET 200AL System Manual page 284

Interrupts, error messages, diagnostics and system alarms
5.3 Alarms
5.3 Alarms
5.3.1 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
– 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
Automation
system with DP
SIMATIC S7/M7
34
interrupt).
Reading the diagnostics with STEP 7
master
Slave diagnostics in plain text in "DP Slave
Diagnostics" tab on STEP 7 interface
"DP NRM_DG" instruction (SFC 13)
Reading out slave diagnostics (store in the
data area of the user program)
"RD_REC" instruction (SFC 59)
Reading out data records of the S7 diag-
nostics data (store in the data area of the
user program)
"RDREC" instruction (SFC 52)
Reading data records from the DP slave
"RALRM" instruction (SFC 54)
Receiving interrupts from the interrupt
OBs
Application See...
"Hardware diagnostics" in STEP 7
online help
SFC: see STEP 7 online help
See System and Standard Functions
reference manual
SFB: refer to STEP 7 online help (sys-
tem functions/function blocks)
SFB: refer to STEP 7 online help (sys-
tem functions/function blocks)
IM 157-1 DP (6ES7157-1AA00-0AB0)
Equipment Manual, 08/2021, A5E32100641-AE