Omron SYSMAC CVM1 Series Operation Manual page 97

PC Link System I/O Response Time
I/O Response Time
In these examples, the I/O response time is defined as the time required for an external input to PC Link node
0 (the polling node) to be output at node 7. The entire process includes the time required for the Link Relay bit
in node 0 to turned ON by an external input, the data to be transferred to node 7, and the output to be turned
ON by instruction execution.
In CVM1/CV-series PLCs, the operation mode can be set to synchronous or asynchronous operation. (The
default setting is asynchronous operation.) The I/O response time will vary depending on the CPU's operation
mode.
Node 0
PC Link Unit
CVM1/CV-
series PLC
Input
Data link bit
Input CIO 10XX.XX
• Conditions
Number of Units in PC Link
Number of LR bits
Max. number of Units
Minimum I/O Response Time (in Synchronous Mode)
Input
Processing
Node 0
in PLC
(PLC #0)
PC Link buffer
PC Link transmission
PC Link buffer
Node 7
Processing
(PLC #7)
in PLC
Output
Minimum I/O response time =
The value n is as shown in the following table.
PLC model
CVM1/CV Series
C1000H/C2000H
• Example Calculation
Input ON delay
Output ON delay
Cycle time of PLC #0
Cycle time of PLC #7
Min. transmission time
82
Node 7
PC Link Unit
Data link bit
CIO 10XX.XX
PC Link
8 Units
128 bits/Unit
8 Units
Cycle
time I/O refreshing Peripheral processing
Instruction
Min. transmission time
execution
I/O response time
Input ON delay + Cycle time of PLC #0 + Minimum transmission time + (Cycle
time of PLC #7 × n) + Output ON delay
n (multiplier)
2
1
1.5 ms
15 ms
20 ms
50 ms
2.8 + 10 = 12.8 ms
CVM1/CV-
series PLC
Output
X
Output
Instruction
execution
Cycle
time
Appendix C