Message Delay Times; Cs/Cj-Series, Cvm1, And Cv-Series Plcs - Omron SYSMAC CS1W-RPT01 Operation Manual

Message Delay Times

8-4 Message Delay Times
8-4-1

CS/CJ-series, CVM1, and CV-series PLCs

SEND
SEND(192)/SEND(90)
executed
264
Assume that the sum of the instruction execution time and I/O refresh time for
the PLCs at nodes #1 and #7 is 1 ms. The equation for minimum data link I/O
response time is as follows:
Input ON delay
Instruction execution time + I/O refresh
time for PLC at node #1
Data processing time
Data link transmission time
Data processing time
Instruction execution time + I/O refresh
time for PLC at node #7
Output ON delay
Total (data link I/O response time)
Noise may increase I/O delays.
The two charts which follow indicate the sequence of processing which will
enable users to calculate the maximum delay time to be expected between
the time SEND(192) or RECV(193) is executed and the time the data is stored
in the destination or source node's memory area, ready for use by other
instructions in the program.
The following diagram indicates the data flow which will yield the maximum
delay time from the time SEND(192)/SEND(90) is executed by the user pro-
gram to the time the Controller Link Unit stores the data in the destination
Unit's memory.
Note Be sure to take into account the time required for data links and program exe-
cution, which are not included in the following example.
Link Service processing (source node)
Transmission processing
Transmission delay
Max. transmission delay
---
1 ms
5.2 ms
1.5 ms
5.2 ms
1 ms
---
13.9 ms
Link Unit servicing (source node)
Communications cycle
Reception processing
Link Service
processing
(source node)
Data stored
Section 8-4
Link Service processing
(destination node)