Siemens PLC

7001 – CPU error

CPU watchdog timeout

Details

CPU watchdog timer has expired indicating program execution problem.

Error typeerror
MeaningWatchdog timeout
Typical causesProgram execution stuck infinite loop program too slow
SolutionsCheck program logic for infinite loops optimize program execution time check interrupt handling
Severitycritical

Catalog references

Vendor Information

Siemens7001

Utilities

Troubleshooting Steps

Troubleshooting steps

Check program logic for infinite loops optimize program execution time check interrupt handling

Other codes

Other Siemens PLC Codes

80A0 – Memory error

Memory allocation error

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80A1 – Memory error

Memory error in retentive data area

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80A2 – Memory error

Memory error in work memory

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80A3 – Memory error

Memory error in load memory

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80A4 – Memory error

Memory card error

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FAQ

Common questions

What causes watchdog timeout?

Programs that take too long to execute or get stuck in loops trigger the watchdog timer.