Omron C200HX Operation Manual page 388

Calculating Cycle Time
Calculations
(8 pts × 3) + (8 pts × 3)
370
It is assumed that the program contains 5,000 instructions requiring an average
of 0.156 μs each to execute, and that nothing is connected to the RS-232C port
and no SYSMAC NET/SYSMAC LINK Unit is mounted.
Host Link Unit
Remote I/O
Master Unit
The equation for the cycle time is as follows:
Cycle time = Overseeing time + Program execution time
+ I/O refreshing time + Host Link Unit servicing time
+ Peripheral device servicing time
Process
Overseeing
Program execution
I/O refresh
Host Link servicing
Peripheral device
servicing
Cycle time
The I/O refreshing time would be as follows for three 8-point Input Units and
three 8-point Output Units mounted in the CPU Rack, and eight Units mounted in
a Slave Rack.
× 20 μs
8 pts
8-point 8-point
Input Units Output Units
16-point 12-point
Input Units Output Units
Calculation With Peripheral
Fixed
0.156 μs/instruction
× 5,000 instructions
See below.
Fixed
0.7 + 0.78 + 2.58 +
6 = 10.06
10.06 × 0.05 = 0.50
Total of above
+ 1.1 ms + 8 Units × 0.17 ms = 2.58 ms
Section 6-2
CPU Rack
Computer
Slave Rack
Without
Device Peripheral Device
0.7 ms 0.7 ms
0.78 ms 0.78 ms
2.58 ms 2.58 ms
6.0 ms 6.0 ms
0.50 ms 0.0 ms
10.56 ms 10.06 ms