Omron CS1W-CLK21-V1, CVM1-CLK21, CS1W-RPT01, CJ1W-CLK21-V1, C200HW-CLK21, CQM1H-CLK21 258

Data Link I/O Response Time Section 8-3

Input

	Input device
	Input ON delay
X	(1)	1 cycle
	Program

X (2)

Communications cycle time

I/O refresh

Data exchange

PLC at node #1

Controller Link Unit transmission processing

Data link transmission

Controller Link Unit transmission processing

PLC at node #7

X(3)

Program

1 cycle

Output device

Output ON delay

Data link I/O response time Output

There are three points shown in the diagram above where processing is delayed, increasing the data link I/O response time.

1,2,3... 1. The input arrives in the PLC just after I/O refreshing, causing a delay of up to one cycle before the input is read into the PLC.

2.Data exchange occurs just after the PLC at node #1 passes the token that makes it the polling node, causing a delay of up to one communications cy- cle time before the data is transferred in data link processing.

3.The data transferred in data link processing arrives at the PLC at node #7 after data exchange, so the data will not be read into the PLC until the next data exchange, causing a delay of up to 1 to 2 cycle.

The maximum number of words that can be exchanged in a single data ex- change is approx. 7,800 words for CS/CJ-series PLCs, approx. 3,700 words for CVM1 and CV-series PLCs, approx. 4,000 for C200HX/HG/HE PLCs, and approx. 1,200 words for CQM1H-series PLCs.

The equation for maximum data link I/O response time is as follows:

Input ON delay	1.5 ms
Cycle time of PLC at node #1 ⋅ 2	15 ms ⋅	2
Communications cycle time ⋅ 3	9.9 ms ⋅	3
PLC cycle time at node #7 ⋅ 2 (See note.)	8 ms ⋅ 2 (See note.)
Output ON delay	15 ms
Total (data link I/O response time)	92.2 ms

Note If the total number of data link words is greater than the maximum number of words that can be exchanged per data exchange, the maximum data link I/O response time will be cycle time of PLC at node #7 ⋅ 3.

In case of the CQM1H, however, the cycle time will be incremented by the value obtained from dividing the total number of data link words by the maxi-

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