Omron CS1W-CLK12-V1, Operation Manual

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Data Link I/O Response Time Section 9-3
CS-series PLCs, CVM1
and CV-series PLCs in
Synchronous Mode When a CS-series, CVM1, or CV-series PLC is operating in synchronous
mode, data exchange with the Controller Link Unit is executed as interrupt
processing during peripheral processing for the PLC cycle. Data exchange
timing is as follows:
If interrupt processing for data exchange is executed, the PLC cycle time will
be lengthened by the time required for the interrupt processing (see 9-3-2
Data Processing Time below).
9-3-2 Data Processing Time
The time required for interrupt processing for data exchange (data processing
time) can be roughly estimated as shown in the following table.
The number of words processed in a single data exchange is shown in the fol-
lowing table for each series of PLC. If the number of data link words exceeds
the value shown in the table, data exchange will be executed as several sepa-
rate processes.
Note 1. Use the above equations only if only one Controller Link Unit is mounted
on the PLC. If other CPU Bus Units are mounted on the PLC, obtain the
refresh times for each CPU Bus Unit and add to the above equations.
2. The execution of some items takes precedence over data link area refresh-
ing. For example, data link area refreshing will not take place during exe-
cution of the SEND(192), RECV(193), or FAL(006) instruction.
PLC cycle time
Execution
PLC processing
Basic processing
Interrupt processing
for data exchange
Execution
I/O refreshing Basic processing
CPU Bus
Unit service
Programming
Device/Host Link
service
Data link scale Equation for estimating data processing time
Data link is established for both areas 1 and 2 0.001
×
Total number of data link words
+
1.7 (ms)
Data link is established for only area 1 or area 2 0.001
×
Total number of data link words
+
1.4 (ms)
PLCs Words per data exchange
CS-series PLCs Approx. 7,800 words
CVM1 and CV-series PLCs Approx. 3,700 words