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The PC responds most quickly when the Master receives the input signal just
prior to I/O refreshing. 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
Program execution
Buffer in Master
Transmission time
Programming Device servicing
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.
Input signal
Output signal
Cycle
Cycle time
I/O refresh
I/O response time
Output ON delay
Input ON delay
Buffer in Master
Transmission time
T
RM
A
B
A
B
A
B
A
B
A: Program execution
B: Programming Device
servicing
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
6-5-3 I/O Response Times in a SYSMAC BUS/2 System
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.
Minimum I/O Response
Time
Maximum I/O Response
Time
I/O Response Time
Section 6-5
Summary of Contents for CVM1D
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