IDEC FC5A-F2M2 User Manual page 113

C PID M
ONFIGURING ODULE USING
(3) Control Register+182: Wait Value
During the program control running, when a step is finished, the PID module checks whether the deviation
between the process variable (PV) and set point (SP)] is less than or equal to the wait value. The program
control is not proceeded to the next step until the deviation becomes less than or equal to the wait value.
The wait function does not work and the program control is proceeded to the next step if the process variable
(PV) satisfies the following condition:
Set Point (SP) – Wait Value ≤ Process Variable (PV) ≤ Set Point (SP) + Wait Value
Example 1: Wait function when the temperature is rising
Set point (SP)
Set point (SP)=500
Step (Wait value is set)
Example 2: Wait function when the temperature is falling
Set point (SP)
Step (Wait value is set)
Set point (SP)=500
Moves to the next step when process variable (PV) reaches 510 C.
How to Cancel Wait Function
The wait function can be cancelled for the program control to proceed to the next step by turning on the
advance next step bit, which is the bit 6 of the operation parameter.
6-48
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W LDR
IND
Wait value: 10 C
T T
490
Moves to the next step when process variable (PV) reaches 490 C.
T
510
Wait value: 10 C
: Program pattern
: Process variable (PV)
: Program pattern delayed by T due to the wait function
FC5A MicroSmart PID Module User's Manual FC9Y-B1283
Time
T
Time