Delta AS Series Operation Manual page 372

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Save Error History Info

This specifies where to store the error log.
 PLC: Store error logs in the PLC. The PLC can store up to twenty error logs. If there are more than twenty
error logs, the oldest error log is overwritten by the latest error log.
 PLC & SD Card: When there are more than twenty error logs, the oldest error log is backed up to the memory
COM Communication Error Record

This parameter sets whether to enable the error record when there is an error at the COM port.
 Disable: Disables this function.
 Enable: Enables this function and starts recording COM errors in the error log.
Select Action When 24Vdc Input Unstable

What to do when the 24Vdc power is unstable: When the power is unstable, this incident will be recorded in error
log and SM7 will be ON.
 Continue Running when power stable: When the power is unstable for 20 to 100 ms, the AS Series PLC
CPU pauses, and after the power stabilizes for at least 2 seconds, the PLC continues running.
 Into Error Status: When the power is unstable, the error LED blinks and the AS Series stops running. The
voltage is unstable and the communication will also be affected. You need to cut the power off and then
solve the power problem. After that you can power-on again and AS Series PLC CPU will start running. If the
communication is not affected, it indicates the power is back to normal. But you still need to find out what
went wrong.
Communication Module Refreshed Priority

 Scan time first: Only refresh the data that is different from the original ones to save scan time.
 Synchronous Data first: Scan and refresh all the data to ensure all data are synchronized.
AS remote module updated method

 PLC Scan cycle first: update according to PLC program scan cycle. Whenever the instruction END is
scanned, one remote module is updated.
 Update one remote module by one scan time: update one remote module at one scan time. Whenever the
instruction END is scanned, one remote module is updated and its output points are outputting at the same
time.
 Update all remote modules at one scan time: update all remote modules at one scan time. Whenever the
instruction END is scanned, all remote modules are updated and all output points are outputting at the same
time.
card before the oldest error log is overwritten in the PLC.
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