Calculating Cycle Time - Omron C200H Operation Manual

Calculating Cycle Time

Calculations
(16 points x 2) + (8 points x 4)
8 points
6-2-2 PC with Link Units
Calculations
The equation for the cycle time from above is as follows:
Cycle time = overseeing time + Link Unit servicing time
+ peripheral device servicing time
+ program execution time
+ I/O refreshing time
The overseeing time is fixed at 2.6 ms. Since there are no Link Units
mounted, the Link Unit servicing time is 0.
The Programming Console is mounted to the PC and the total cycle time of
operations 1, 2, 4, and 5 is less than 13 ms, so the peripheral device servic-
ing time is 0.8 ms.
The program execution time is 4.7 ms (0.94 µs/instruction times 5,000
instructions).
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 points x 2) + (8 points x 5)
x 70 µs +
The cycle time would thus be 2.6 ms + 0.8 ms + 4.7 ms + 0.9 ms = 9.0 ms
Here, the cycle time is computed for a PC with a CPU01-E, or 03-E CPU
Unit, 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 con-
taining four 16-point Input Units and four 12-point Output Units. The PC con-
figuration for this could be as shown below. It is assumed that the program
contains 5,000 instructions requiring an average of 0.94 µs each to execute.
Host Link Unit
8-point
Remote I/O Input Units
Master Unit
16-point
Input Units
The equation for the cycle time is as follows:
Cycle time = overseeing time + Link Unit servicing time
+ peripheral device servicing time
+ program execution time
+ I/O refreshing time
8 points
8-point
Output Units
Computer
12-point
Output Units
Section 6-2
x 40 µs = 0.92 ms
CPU Rack
Slave Rack
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