Chapter 6 Applied Instructions
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set to ON.
(b) If the external 24 V voltage of the first local extension backplane is abnormal, bit 1 in SR731
will be set to ON.
4. The external interrupts (I40~I251)
If a peripheral device, e.g. a special I/O module, sends an interrupt request, the PLC will
execute the specific interrupt task.
5. The timed interrupts (I252~I255)
Timed interrupt 0 (I252): The default value is 100 milliseconds (1~1000 milliseconds).
Timed interrupt 1 (I253): The default value is 40 milliseconds (1~1000 milliseconds).
Timed interrupt 2 (I254): The default value is 20 milliseconds (1~1000 milliseconds).
Timed interrupt 3 (I255): The default value is 10 milliseconds (1~1000 milliseconds).
The timed interrupt task is executed every specific period of time. For example, the timed
interrupt task is executed every 10 milliseconds.
The priority order is a follows.
I32
(COM1)
33
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