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Cycle Time/High-speed Processing Section 6-1
Reducing the Cycle Time
The following methods are effective ways to reduce the cycle time in CS/CJ-
series PLCs:
1,2,3... 1. Put tasks that aren’t being executed in standby.
2. Jump program sections that aren’t being executed with JMP(004) and
JME(005).
For CS1-H or CJ1-H CPU Units in parallel processing mode, the peripheral
servicing cycle time will be stored in A268 (Peripheral Servicing Cycle Time)
each servicing cycle.
6-1-4 High-speed Inputs
When you want to receive pulses that are shorter than the cycle time, use the
CS1W-IDP01 High-speed Input Unit or use the high-speed inputs of the
C200H-ID501/ID215 and C200H-MD501/MD115/MD215 High-density I/O
Units.
The high-speed inputs can receive pulses with a pulse width (ON time) of
1 ms or 4 ms for the C200H High-density Input Units and 0.1 ms for the
CS1W-IDP01 High-speed Input Unit.
6-1-5 Interrupt Functions
Interrupt tasks can be executed for the following conditions. Refer to 4-3 Inter-
rupt Tasks
for more details.
I/O Interrupts (Interrupt tasks 100 to 131)
An I/O interrupt task is executed when the corresponding input (on the rising
edge of the signal or, for CS/CJ-series Interrupt Input Units, on either the ris-
ing or falling edge) is received from an Interrupt Input Unit.
Scheduled Interrupts (Interrupt tasks 2 and 3)
A scheduled interrupt task is executed at regular intervals.
Power OFF Interrupt (Interrupt task 1)
This task is executed when the power is interrupted.
External Interrupts (Interrupt tasks 0 to 255)
An external interrupt task is executed when an interrupt is received from a
Special I/O Unit, CPU Bus Unit, or Inner Board.
Note The built-in interrupt inputs and high-speed counter inputs on a CJ1M CPU
Unit can be used to activate interrupt tasks. Refer to the CJ Series Built-in I/O
Operation Manual for details.
High-speed Input Unit or
High-density Input Unit
CS1W-IDP01: 0.1 ms
CJ1W-IDP01: 0.05 ms
C200H-ID501/ID215/MD501/MD115/MD215: 4 ms
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