Omron SYSMAC CVM1 Series Operation Manual page 98

PC Link System I/O Response Time
If the PLCs are CVM1/CV-series PLCs, the multiplier (n) is 2.
Minimum I/O response time =
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)
Input
Instruction
Node 0
execution cycle
(PLC #0)
Peripheral
processing cycle
PC Link buffer
PC Link transmission
PC Link buffer
Peripheral
processing cycle
Node 7
(PLC #7)
Instruction
execution cycle
Output
Minimum I/O response time =
• Example Calculation
Input ON delay
Output ON delay
Peripheral processing time of PLC #7
Min. transmission time
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.
1.5 + 20 + 12.8 + (50 × 2 ) + 15 = 149.3 ms
Instruction
Cycle
I/O refreshing
execution
time
Min. transmission time
Cycle time
Instruction
execution
I/O response time
Input ON delay + Minimum transmission time + Peripheral processing time of
PLC #7 + Output ON delay
1.5 ms
15 ms
3 ms
2.8 + 10 = 12.8 ms
Appendix C
83