12-13
12 CPU Unit Cycle Time
CJ2 CPU Unit Software User’s Manual
12-2 Computing the Cycle Time
12
12-2-5 Online Editing Cycle Time Extension
Online editing can be executed from the CX-Programmer while the CPU Unit is in MONITOR mode.
The cycle time will be extended by approximately 1 ms due to the write processing for the CPU Unit
program. If you do not want the cycle time to be extended by a particular amount, use the online editing
prohibit (standby) function. For details, refer to 10-7-4 Online Editing.
The I/O response time is the time it takes from when an Input Unit's input turns ON, the data is recog-
nized by the CJ-series CPU Unit, and the user program is executed, up to the time for the result to be
output to an Output Unit's output terminals.
The length of the I/O response time depends on the following conditions.
• Timing of Input Bit turning ON.
• Cycle time.
• Type of Rack to which the Input and Output Units are mounted (CPU Rack or Expansion Rack).
z Minimum I/O Response Time
The I/O response time is shortest when data is retrieved immediately before I/O refresh of the CPU
Unit.
Note The Input and Output ON delay differs according to the Unit used.
12-2-5 Online Editing Cycle Time Extension
12-2-6 I/O Response Time
CJ-series Basic I/O Unit Response Times
The minimum I/O response time is the total of the Input ON delay, the cycle time, and the Output ON delay.
I/O refresh
Input
Output
Cycle timeCycle time
Minimum I/O response time
(Refreshed in CPU Unit)
Output ON delay
Input ON delay
Instruction
execution
Instruction
execution
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