Digital Modules
3-105
Programmable Logic Controllers S7-300 Module Data
A5E00105505-03
Error causes and remedies
Table 3-27 Diagnostic messages of the SM 322; DO 8 x Rel. 230 VAC/5A, error causes and remedies
Diagnostics
Message
Error Detection Possible Error Cause Remedy
Time-out Always Temporary high
electromagnetic
interference
Remove interference and turn
the CPU power supply off and
on
Module defective Replace module
EPROM error Always Temporary high
electromagnetic
interference
Remove interference and turn
the CPU power supply off and
on
Module defective Replace module
RAM error Always Temporary high
electromagnetic
interference
Remove interference and turn
the CPU power supply off and
on
Module defective Replace module
3.29.3 Interrupts of the SM 322; DO 8 x Rel. 230 VAC/5A
Introduction
The SM 322; DO8 x Rel.230VAC/0.5 A can trigger diagnostic interrupts.
The OBs and SFCs mentioned below can be found in the online Help for STEP 7,
where they are described in greater detail.
Enabling interrupts
The interrupts are not available – in other words, they are inhibited without
appropriate parameter assignment. Use STEP 7 to assign parameters for enabling
interrupts.
Diagnostic Interrupt
If you have enabled diagnostic interrupts, then incoming active error events (initial
occurrence of the error) and departing error events (message after
troubleshooting) are reported by means of interrupts.
The CPU interrupts execution of the user program and processes the diagnostic
interrupt block (OB 82).
In the user program, you can call SFC 51 or SFC 59 in OB 82 to obtain more
detailed diagnostic information from the module.
The diagnostic information is consistent until such time as OB 82 is exited. When
OB 82 is exited, the diagnostic interrupt is acknowledged on the module.
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