IDEC MICROSmart FC6A Series Ladder Programming Manual page 396

19: PID C I
ONTROL NSTRUCTION
■Input tab
This tab configures the input parameters for the PIDA instruction.
1.
2.
3.
4.
5.
6.
10.
8.
9.
1. Process Variable (S1+0)
Configure the input for the PID control. The process variable is linearly converted and given to the PID control for the input
value. The value can be selected as Analog Input or Data Register.
When Analog Input is specified
Specify the module with the analog input you want to specify as the process variable and its analog input number to set as
PID control input.
Analog Module Configure: Select the analog input module.
Analog Input No.:
The analog input value is also stored in a control register (S1+0) as a read-only value.
For control registers, see "1. S1 (source 1): Control Register" on page 19-4.
Notes:
• To use an analog input, the analog input must be configured in advance. For details on analog input settings, see Chapter 9 "Analog I/O
Modules" in the "FC6A Series MICROSmart User's Manual".
• When using an analog input, the analog volume value cannot be used as the process variable. However, the analog volume value can be used
as the process variable by specifying Data Register as the process variable and specifying a special data register that stores the analog
volume value.
• When Analog Input is specified, the minimum value and the maximum value of the analog input settings are used as the minimum value
and the maximum value for the input.
When Data Register is specified
The value stored in S1+0 of the control registers is used as the PID control input.
The range of stored values is minimum value (5) ≤ process variable ≤ maximum value (4). For control registers, see "1. S1
(source 1): Control Register" on page 19-4.
Configure parameters 2. Device Address through 5. Minimum Value when Data Register is selected as the process variable.
2. Device Address
Shows the first data register (S1+0) of the control registers configured on the Devices tab.
3. Data Type
Select the process variable (1) data type as W (word) or I (integer).
4. Maximum Value, 5. Minimum Value
Set the process variable (1) range as a maximum value and a minimum value. Set the input settings in PID control (process
variable, Alarm 1 (process high alarm) value, and Alarm 2 (process low alarm) value) and the set point within the maximum and
minimum value range. The maximum value and minimum value can be configured within the range of the data type (3).
• When the data type is I (integer): -32,768 to +32,767.
• When the data type is W (word): 0 to 65,535
Note: If the process variable (1) is larger than the maximum value (4), or if the process variable (1) is smaller than the minimum value (5),
status code 109 is stored in the operating status (S1+2) and PID control stops.
For status code details, see "Operation status (S1+2)" on page 19-19.
19-6
11. 12.
Select the module as the CPU/HMI module or expansion module 1 to 15.
Select the input number on the analog input module.
Select as AI0 to AI7. The device range that can be used depends on the model.
FC6A S MICROS L
ERIES MART
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ADDER ROGRAMMING ANUAL
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