Task Error

What does A295.12 mean?

A task error has occurred, meaning there is no executable cyclic task or no task corresponds to an interrupt that was input. This is particularly critical if the 'Stop CPU on Instruction Error' parameter in the PLC Setup is set to 'Stop', leading to a fatal program error (0x80F0).

• No executable cyclic task is defined.
• No task corresponds to a received interrupt, and the 'Stop CPU on Instruction Error' parameter in PLC Setup is set to 'Stop'.
• Incorrect startup cyclic task attributes are configured.
• Task numbers specified in TKON(820), TKOF(821), or MSKS(690) instructions do not have corresponding created tasks.
• The power OFF interrupt task is enabled in PLC Setup but has not been created.

Click steps to track your progress.

1. 1

   Check the startup cyclic task attributes.

2. 2

   Verify the execution status of each task as controlled by TKON(820) and TKOF(821).

3. 3

   Confirm that all task numbers specified in TKON(820), TKOF(821), and MSKS(690) instructions have corresponding created tasks.

4. 4

   Use MSKS(690) to mask any I/O or scheduled interrupt tasks that are not being used and do not have programs set for them.

5. 5

   If the power OFF interrupt task is enabled in PLC Setup, verify that the power OFF interrupt task has been created.