Omron SYSMAC CS Series Operation Manual page 165

Description of Operation
Example
Process-control CPU Unit
(CS1D-CPU@@P)
Example
Minimum External I/O Response Time
CS1W-LCB01 and CS1W-
LCB05 Loop Control
Boards and Loop-control
CPU Units (CJ1G-
CPU@@P)
Example
Process-control CPU Unit
(CS1D-CPU@@P)
Example
Note
1,2,3...
Cycle time of 20 ms, operation cycle of 0.1 seconds (100 ms), A/D conversion
time = 8 ms, D/A conversion time = 8 ms
In this example, the maximum I/O response time would be as follows:
2 x 8 ms + (2 x 20 ms) + (2 x 100 ms) + 2 x 8 ms = 272 ms
The maximum external I/O response time is calculated as follows:
2 x A/D conversion time + (2 x CY) + (3 x T) + 2 x D/A conversion time
where,
CY: Cycle time of the CPU Unit (∗1)
T: Max. operation cycle time (∗2)
∗1: If the actual cycle time is less than 20 ms, use 20 ms for CY (cycle time).
∗2: Longest operation cycle in the function block group comprising the loop
Cycle time of 20 ms, max. operation cycle of 0.1 seconds (100 ms), A/D con-
version time = 8 ms, D/A conversion time = 8 ms
In this example, the maximum I/O response time would be as follows:
2 x 8 ms + (2 x 20 ms) + (3 x 100 ms) + 2 x 8 ms = 372 ms
The minimum external I/O response time is calculated as follows:
A/D conversion time + (1.0 x T) + D/A conversion time
where,
T: Operation cycle
Operation cycle of 0.01 seconds (10 ms), A/D conversion time = 1 ms, D/A
conversion time = 1 ms
In this example, the maximum I/O response time would be as follows:
1 ms + (1.0 x 10 ms) +1 ms = 12 ms
The minimum external I/O response time is calculated as follows:
A/D conversion time + (1.0 x T) + D/A conversion time
where,
T: Operation cycle
Operation cycle of 0.1 seconds (100 ms), A/D conversion time = 1 ms, D/A
conversion time = 1 ms
In this example, the maximum I/O response time would be as follows:
1 ms + (1.0 x 100 ms) +1 ms = 102 ms
Precautions when Using the Analog Input/Output Unit
The unit number set on the front panel of the Unit must always match the unit
number setting of the Field Terminals.
When running of the Loop Controller is started using the Field Terminals, the
Loop Controller executes the following writing on the allocated CIO area of the
unit number specified by the Field Terminals.
1. Analog values are written on the allocated CIO area of the analog output
data on the Analog Output Unit and Analog Input/Output Unit.
2. Writing is performed internally on the leading words (n) of the allocated
CIO area on the Analog Output Unit and Analog Input/Output Unit.
Section 3-2
133