I/O Response Times In A Sysmac Bus System; I/O Response Times In A Sysmac Bus/2 System - Omron SYSMAC CVM1 Series Operation Manual

I/O Response Time
Minimum I/O Response
Time
Cycle
Buffer in Master
Transmission time
Input signal
Output signal
Maximum I/O Response
Time
Cycle time
A
Cycle
I/O refresh
Buffer in Master
Transmission time
Input signal
Input ON delay
Output signal

6-5-3 I/O Response Times in a SYSMAC BUS/2 System

The PC responds most quickly when the Master receives the input signal just
prior to I/O refreshing. This situation is illustrated below.
Programming Device servicing
Input ON delay
I/O response time
Minimum I/O response time = input ON delay + cycle time
+ Slave transmission time x 2 + output ON delay
Minimum I/O response time = 1.5 + 20 + 2.2×2 +15 = 40.9 ms
The PC takes longest to respond when the Master receives the input signal just
after I/O refreshing. This situation is illustrated below.
B A B
T
RM
I/O response time
Maximum I/O response time = input ON delay + cycle time x 2
+ Master transmission time x 2 + Slave transmission time x 2
+ output ON delay
Maximum I/O response time = 1.5 + (20×2) +(8.2×2) +(2.2×2) +15 = 77.3 ms
Here, we'll compute the minimum and maximum I/O response times for PC con-
trolling a SYSMAC BUS/2 System. Both the input and output are on Units con-
nected to Slave Racks. The PC receives data from the Master once each cycle.
The Master waits to transfer to the PC after refreshing.
Cycle time
Program execution
I/O refresh
A B A B
Section 6-5
Output ON delay
A: Program execution
B: Programming Device
servicing
Output ON delay
439