Omron CS1W-RPT01, CVM1-CLK21 Data Processing Time, Under Asynchronous, CS/CJ-series PLCs, CVM1

Data Link I/O Response Time		Section 8-3
CVM1 and CV-series PLCs	When a CVM1 or CV-series CPU Unit is operating in asynchronous mode,
Under Asynchronous	data exchange with the Controller Link Unit is executed as interrupt process-
Operation	ing during peripheral processing, regardless of the cycle time of PLC instruc-
	tion execution. Data exchange timing is as follows:

	PLC cycle time
Instruction execution	Execution	Execution	Execution
	I/O refreshing	I/O refreshing	I/O refreshing
PLC processing	Peripheral servicing interval

Peripheral processing	CPU Bus	Programming	CPU Bus	Programming	CPU Bus	Programming
		Device/Host Link
			Unit service	Device/Host Link	Unit service	serviceDevice/Host Link
	Unit service service			service
Basic processing	Interrupt processing		Interrupt processing		Interrupt processing
	for data exchange		for data exchange		for data exchange
		Basic processing		Basic processing

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 8-3-2 Data Processing Time on page 254).

CS/CJ-series PLCs, CVM1	When a CS/CJ-series, CQM1H-series, CVM1, or CV-series PLC is operating
and CV-series PLCs in	in synchronous mode, a CQM1H-series, or a C200HX/HG/HE PLC is operat-
Synchronous Mode,	ing, data exchange with the Controller Link Unit is executed as processing
CQM1H-series PLCs, and	during peripheral processing for the PLC cycle. Data exchange timing is as
C200HX/HG/HE PLCs	follows:
	PLC cycle time

PLC processing	Execution	I/O refreshing	Peripheral
			service

Execution

Basic processing	Processing for	Basic processing
	data exchange

If processing for data exchange is executed, the PLC cycle time will be length- ened by the time required for the interrupt processing (see 8-3-2 Data Pro- cessing Time below).

8-3-2 Data Processing Time

The time required to process data exchange (data processing time) can be roughly estimated as shown in the following table.

CPU Unit	Equation estimating data processing time
CS1-H, CJ1-H, CJ1M CPU Unit	0.1 ms + Number of transfer words ⋅		0.7 ∝s
CS1, CJ1 CPU Unit	1.5 ms + Number of transfer words	⋅	1 ∝s
CVM1-series CPU Unit	1.7 ms + Number of transfer words	⋅	1 ∝s

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.

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