Description Of The Response Time - Omron CJ1W-CT021 Operation Manual

The Response Time of the CJ1W-CT021 High-speed Counter Unit is the time between the Unit receiving a count
pulse (on one of the Counter inputs A or B) and the switching (ON or OFF) of a corresponding Digital Output.
The Response Time can vary between 0.1 and 0.5 milliseconds, but is guaranteed to be less than 0.5
milliseconds. The following factors cause the Response Time to fluctuate:
•
the number of Counters simultaneously crossing a Range Limit or Comparison Value
•
the asynchronous (with respect to the Unit) Cyclic I/O Refresh triggered by the CJ-series PLC
The maximum Response Time of 0.5 milliseconds can no longer be guaranteed and will temporarily become
longer than 0.5 milliseconds in case you make use of:
•
IOWR/IORD-instructions
•
IORF-instructions
•
Programmable Output Pulses
•
Rate Measurement for one or more Counters
•
Digital Inputs or Z-inputs
•
Outputs- and or Digital Inputs generating Interrupts to the CJ1-H PLC
Note
•
When using one of the above functions, the approximate response time will be as follows:
Response time = 0.5 ms + function execution time.
•
Refer to Appendix E "IORF and IOWR/IORD-instruction Execution Times" for information on execution times for
IORF and IOWR/IORD-instructions.
•
External Control Inputs and Z-signal Inputs require approximately 300 µs, and external interrupt tasks require
10 µs per interrupt.
Appendix C

Description of the Response Time

Input
circuitry
A
B
Response Time to switch
Digital OutputON
Response Time to Switch
Digital Output OFF
CJ1W-CT021
Output
circuitry
Digital Output
171