Omron CVM1 Series, Operation Manual

Page: 100 / 110

85
PC Link System I/O Response Time Appendix C
Maximum I/O Response Time (in Asynchronous Mode)
Maximum I/O response time = Input ON delay + Cycle time of PLC #0 + Peripheral processing time of PLC
#0 + (PC Link cycle time
×
2) + Polling sequence processing time + (Periph-
eral processing time PLC #7
×
2) + Cycle time of PLC #7 + Output ON delay
• Example Calculation
Maximum I/O response time = 1.5 + 20 + 3 + (32.4
×
2) + 120 + (3
×
2) + 50 + 15 = 280.3 ms
Note The I/O response time may be extended by environmental factors such as noise.
Node 0
(PLC #0)
PC Link transmission
Input
PC Link buffer
Node 7
(PLC #7)
Output
Peripheral
processing cycle
PC Link buffer
Instruction
execution cycle
Peripheral
processing cycle
Instruction
execution cycle
Cycle
time
Instruction execution
I/O refreshing
Max. transmission time
PC Link
cycle time
Cycle
time
Instruction
execution
Solicitation
sequence
processing
Input ON delay 1.5 ms
Output ON delay 15 ms
Cycle time of PLC #0 20 ms
Peripheral processing time of PLC #0 3 ms
Cycle time of PLC #7 50 ms
Peripheral processing time of PLC #7 3 ms
PC Link Cycle Time 2.8
×
8 Units + 10 = 32.4 ms
Polling sequence processing time 15 ms
×
(16 Units
−
8 Units) = 120 ms