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Computing the Cycle Time Section 2-7
Watch Cycle Time
If the cycle time exceeds the watch (maximum) cycle time setting, the Cycle
Time Too Long Flag (A401.08) will be turned ON and PLC operation will be
stopped.
PLC Setup
Related Flags
Cycle Time
Monitoring
The maximum cycle time is stored in A262 and A263 and the present cycle
time is stored in A264 and A265 every cycle.
Related Words
The average cycle time for the past eight cycles can be read from the CX-Pro-
grammer.
Note The following methods are effective in reducing the cycle time.
• Place tasks that do not need to be executed on standby.
• Use JMP-JME instructions to skip instructions that do not need to be exe-
cuted.
Name Settings Default
Enable Watch Cycle
Time Setting
0: Default (1 s)
1: User setting
0000 hex: Watch cycle time of
1 s
Watch Cycle Time 001 to FA0: 10 to 40,000 ms
(10-ms increments)
Name Address Description
Cycle Time Too Long
Flag
A401.08 Turns ON if the present cycle time exceeds the
Watch Cycle Time set in the PLC Setup.
Name Addresses Description
Maximum Cycle
Time
A262 and
A263
These words contain the maximum cycle time in
increments of 0.1 ms. The time is updated every
cycle and is recorded in 32-bit binary (0 to FFFF
FFFF hex, or 0 to 429,496,729.5 ms). (A263 is
the leftmost word.)
Present Cycle Time A264 and
A265
These words contain the present cycle time in
increments of 0.1 ms. The time is updated every
cycle and is recorded in 32-bit binary (0 to FFFF
FFFF, or 0 to 429,496,729.5 ms). (A265 is the
leftmost word.)
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