Omron SYSMAC CV Series - 8-1 Alarm Indicators; 8-2 Programmed Alarms and Error Messages; 8-3 Reading and Clearing Errors and Messages; 8-4 Error Messages

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The PC responds most quickly when it receives an input signal just prior to SYS-
MAC BUS/2 refreshing.
Input signal
Output signal
Cycle
Cycle time
I/O refresh
I/O response time
Output ON delay
Input ON delay
Buffer in Master
AB
A: Program execution
B: Peripheral servicing
AB AB
Minimum I/O response time = input ON delay
+ communications cycle time × 5+ cycle time x 2
+ output ON delay
Minimum I/O response time = 1.5 + (5×5) + (20×2) +15 = 81.5 ms
The PC takes longest to respond when it receives the input signal just after SYS-
MAC BUS/2 refreshing. In this case the CPU does not recognize the input signal
until the next cycle. This situation is illustrated below.
Input signal
Output signal
Cycle
Cycle time
I/O refresh
I/O response time
Output ON delay
Input ON delay
Buffer in Master
AB
A: Program execution
B: Peripheral servicing
AB AB A
Maximum I/O response time = input ON delay
+ communications cycle time × 7 + cycle time × 3
+ 10 ms + output ON delay
Maximum I/O response time = 1.5 + (5×7) + (20×3) +10 +15 = 121.5 ms
Minimum I/O Response
Time
Maximum I/O Response
Time
I/O Response Time Section 6-5