Omron CVM1D, Operation Manual

Page: 422 / 468

418
2. The CPU will begin initialization when the CPU reset signal is turned OFF.
3. When CPU initialization is completed, the program will be executed. The
new power interruption time is written to A012 and A013 and the new num-
ber of power interruptions is written to A014.
Momentary power interruptions are not treated as errors.
Note 1. The momentary power interruption time is fixed at 0 ms.
2. The actual time that power is interrupted is the power interruption detection
time (10 ms to 25 ms) + the shutdown processing time (1 ms).
Related Auxiliary Area Words Auxiliary Area words A012 and A013 contain the time at which power was inter-
rupted, as shown in the following table.
Word Bits Contents Possible values
A012 00 to 07 Seconds 00 to 59
08 to 15 Minutes 00 to 59
A013 00 to 07 Hours 00 to 23 (24-hour system)
08 to 15 Day of month 01 to 31 (adjusted by month and for leap year)
A014 00 to 15 Number of power interruptions (0 to 9,999)
6-2 Cycle Time
Understanding the operations that occur during the cycle and the elements that
affect cycle time is essential to effective programming and PC operations. The
major factors in determining program timing are the cycle time and the I/O re-
sponse time. One cycle of CPU operation is called a cycle; the time required for
one cycle is called the cycle time. The time required to produce a control output
signal following reception of an input signal is called the I/O response time.
To aid in PC operation, the present and maximum cycle times are recorded in the
read-only section of the Auxiliary Area. The present cycle time is held in A462
and A463 and the maximum cycle time is held in A464 and A465.
Cycle Time
Section 6-2