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System Setup, Auxiliary Area Allocations, and Built-in I/O Allocations Appendix C
Note The watch cycle time setting cannot be changed while the Module is in RUN or MONITOR mode.
Note The default value for the watch cycle time is 50 ms.
Fixed Peripheral Servicing Time
This setting determines whether the peripheral servicing for the following processes is performed with
the default settings (6.25% of the cycle time) or all together in a fixed servicing time.
Exchange data with Modules when necessary
Exchange data with peripheral port
Exchange data with serial communications ports
The following table shows a breakdown of the peripheral servicing time.
Note A default value of 100
µs is allocated in Motion Control Modules for event servicing with the Coordinator
Module
ON
Watch
Time
Watch Cycle
Time
Watch Cycle
Time
Watch Cycle
Time
Actual Cycle
Time
Actual Cycle
Time
Actual Cycle
Time
Cycle Time
Too Long Flag
A401.08
↓
Module operation
is stopped.
OVER
↓
Peripheral servicing time Default value Setting range
Event service time for
Motion Control Modules
6.25% of the previous
cycle’s cycle time
Uniform servicing time in ms:
0.0 to 25.5 ms (unit: 0.1 ms)
Event service time for
peripheral port
Same as above.
Event service time for
RS-232C port
Same as above.
Event service time for
RS-422A port
Same as above.
Initialization
Power ON
Common processes
Program execution
(Tasks executed)
I/O refreshing
Peripheral servicing
Cycle
time
Cyclic refreshing