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Description of Operation
Section
3-2
100
The execution order is as follows:
Field terminal: AI 8-point Terminal (551)
Operation blocks: Square Root (131)
→
Non-linear Gain (133)
Control block: Basic PID (011)
Field terminal: AO 8-point Terminal (552)
Note 2
Though "non-linear" is after "basic PID" in the software wiring, it becomes
after "square root" in the operation order. For this reason, the MV value from
"basic PID" one operation cycle before is calculated in a non-linear manner.
3-2-10 About Load Rate
The minimum operation cycle of each of the function blocks on the Loop
Control Unit can be set to 0.1 seconds. However, when many function blocks
are used, the processing capability of the Loop Control Unit prevents
processing at the specified operation cycle. For this reason, the Loop Control
Unit is provided with the "load rate" concept as an indicator of its processing
capability. This load rate is one condition for determining the operation cycle
of the function blocks. (See 3-2-8 Conditions for Determining the Operation
Cycle on page 96.)
The "load rate" is obtained by dividing the "time up to the idling period of
entered after actual execution of all function blocks of a group having a
certain operation cycle has ended" by the set operation cycle.
The actual operation execution cycle is a total of the following two times:
(1) Overhead time (FINS command communications and internal
processing)
(2) Total operation execution time of each function block in the same
operation cycle group
Block A
Block F
Actual operation time
Set operation cycle
Block A
Block F
Actual operation time
Set operation cycle
Time
Idling
Idling
Load rate: 55%
Load rate: 60%