Pc With Link Units; Calculating Cycle Time - Omron SYSMAC C200HS Operation Manual

Calculating Cycle Time

Calculations
(16 pts x 2) + (8 pts x 4)
8 pts

6-2-2 PC with Link Units

The equation for the cycle time from above is as follows:
Cycle time = Overseeing time + Program execution time + I/O refresh time +
Peripheral device servicing time
Process Calculation
Overseeing Fixed
0.47 µs/instruction
Program execution
× 5,000
instructions
I/O refresh See below.
Peripheral device Minimum time
servicing
Cycle time Total of above
The I/O refresh time would be as follows for two16-point Input Units, four 8-point
Input Units, two 12-point Output Units (12-point Units are treated as 16-point
Units), and five 8-point Output Units controlled by the PC:
(16 pts x 2) + (8 pts x 5)
x 20 µs +
Here, the cycle time is computed for a PC with a CPU21-E or CPU23-E CPU that
has a Memory Unit with a clock function installed. The PC configuration for this
could be as shown below.
The CPU controls three 8-point Input Units, three 8-point Output Units, a Host
Link Unit, and a Remote I/O Master Unit connected to a Remote I/O Slave Rack
containing four 16-point Input Units and four 12-point Output Units.
It is assumed that the program contains 5,000 instructions requiring an average
of 0.47 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
8-point
Remote I/O
Input Units
Master Unit
16-point
Input Units
With Peripheral
Device
0.7 ms
2.35 ms
0.34 ms
0.26 ms
3.65 ms
x 20 µs = 0.34 ms
8 pts
8-point
Output Units
Computer
12-point
Output Units
Section 6-2
Without
Peripheral Device
0.7 ms
2.35 ms
0.34 ms
0.0 ms
3.39 ms
CPU Rack
Slave Rack
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