Omron CVM1 Series, Operation Manual

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PC Link System I/O Response Time Appendix C
If the PLCs are CVM1/CV-series PLCs, the multiplier (n) is 2.
Minimum I/O response time = 1.5 + 20 + 12.8 + (50
× 2
) + 15 = 149.3 ms
Note (1) The I/O response time may be extended by environmental factors such as noise.
(2) Differences in I/O response times among different PLC models:
The PC Link Unit’s I/O response time is different in C1000H/C2000H PLCs and CVM1/CV-series
PLCs. When a CVM1/CV-series CPU Unit is operating in synchronous mode, it one PLC execution
cycle longer to read data from the PC Link, in comparison with a C1000H/C2000H PLC.
Minimum I/O Response Time (in Asynchronous Mode)
Minimum I/O response time = Input ON delay + Minimum transmission time + Peripheral processing time of
PLC #7 + Output ON delay
• Example Calculation
Minimum I/O response time = 1.5 + 12.8 + 3 + 15 = 32.3 ms
Note The I/O response time may be extended by environmental factors such as noise.
I/O response time
Node 0
(PLC #0)
PC Link transmission
Input
PC Link buffer
Min. transmission time
Instruction
execution
Cycle
time
I/O refreshing
Node 7
(PLC #7)
Output
Peripheral
processing cycle
PC Link buffer
Instruction
execution cycle
Peripheral
processing cycle
Instruction
execution cycle
Instruction
execution
Cycle time
Input ON delay 1.5 ms
Output ON delay 15 ms
Peripheral processing time of PLC #7 3 ms
Min. transmission time 2.8 + 10 = 12.8 ms