30.12.3 Adjusting the Setting Values for the PID Instruction

You can adjust the setting values for the PID instructions while monitoring the values in the [PID Monitor] window.

  1. Run the online monitor.

  2. On the [View (V)] menu, point to [Work Space (W)] and then click [PID Monitor Window (M)]. The [PID monitor] window opens.

  3. In [Target PID Variable], select the PID variable that you want to monitor. The PID instruction setting is displayed in a graph. 

  4. You can change the setting values while looking at the graph.
    When the setting value is changed, the data is written to the following devices.

Items on the Screen

Save in

Remarks

Target PID Variable

None

Displays PID variables selected.

Setpoint (SP)

Operand S1

Can be changed only when the instruction operand is a variable.

Tieback (TB)

Operand S3

Can be changed only when the instruction operand is a variable.

Proportional Constant

Variable Format****.KP

Address Format U_****.KP

Set value (x 1000).

Integral Calculus Time

Variable Format ****.IT

Address Format U_****.IT

Set value (x 1000).

Differential Calculus Time

Variable Format ****.DT

Address Format U_****.DT

Set value (x 1000).

Processing Deadband Range

Variable Format ****.PA

Address Format U_****.PA

 

Bias

Variable Format ****.BA

Address Format U_****.BA

 

Frequency in Sampling

Variable Format ****.ST

Address Format U_****.ST