Data Processing Time - Omron CS1W-CLK12-V1 Operation Manual

Data Link I/O Response Time
CS-series PLCs, CVM1
and CV-series PLCs in
Synchronous Mode
PLC processing
Basic processing
9-3-2

Data Processing Time

Data link scale
Data link is established for both areas 1 and 2
Data link is established for only area 1 or area 2
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:
Execution
I/O refreshing
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).
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.
PLCs
CS-series PLCs
CVM1 and CV-series PLCs
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
Programming
CPU Bus
Device/Host Link
Unit service
service
Interrupt processing
for data exchange
Equation for estimating data processing time
0.001 × Total number of data link words + 1.7 (ms)
0.001 × Total number of data link words + 1.4 (ms)
Words per data exchange
Approx. 7,800 words
Approx. 3,700 words
Section 9-3
Execution
Basic processing
191