Data Processing Time - Omron SYSMAC CS1W-CLK13 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

Note
More than one data exchange can be executed during a PLC cycle, depend-
ing on the data exchange timing. If interrupt processing for data exchange is
executed, the peripheral servicing interval will be lengthened by the time
required for the interrupt processing (see 9-3-2 Data Processing Time on
page 225).
When a CS-series, CVM1, or CV-series PLC is operating in synchronous
mode, data exchange with the Controller Link Unit is executed during periph-
eral processing for the PLC cycle. Data exchange timing is as follows:
PLC cycle time
Execution I/O refreshing
Processing for
data exchange
If processing for data exchange is executed, the PLC cycle time will be length-
ened by the time required for processing (see 9-3-2 Data Processing Time
below).
The time required to process data exchange (data processing time) can be
roughly estimated as shown in the following table.
CPU Unit
CS1-H-series CPU Unit
CS1-series CPU Unit
CVM1-series CPU Unit
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
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.
Peripheral
Execution
service
Basic processing
Equation estimating data processing time
0.1 ms + Number of transfer words × 0.7 µs
1.5 ms + Number of transfer words × 1 µs
1.7 ms + Number of transfer words × 1 µs
Words per data exchange
Approx. 7,800 words
Approx. 3,700 words
Section 9-3
225