Using PID_Temp
6.3 Commissioning PID_Temp
PID control
Function Manual, 03/2017, A5E35300227-AC
189
The following section describes how you can use "Manual mode" in the commissioning
window of the "PID_Temp" technology object.
Manual mode is also possible when an error is pending.
● The "PID_Temp" instruction is called in a cyclic interrupt OB.
● An online connection to the CPU has been established.
● The CPU is in "RUN" mode.
If you want to test the controlled system by specifying a manual value, use "Manual mode" in
the commissioning window.
To define a manual value, follow these steps:
1. Double-click the "PID_Temp > Commissioning" entry in the project tree.
2. Activate the "Monitor all"
button or start the trend view.
An online connection will be established.
3. Select the "Manual mode" check box in the "Online status of controller" area.
PID_Temp operates in manual mode. The most recent current output value remains in
effect.
4. Enter the manual value in the editable field as a % value.
If cooling is activated in the basic settings, enter the manual value as follows:
– Enter a positive manual value to output the value at the outputs for heating.
– Enter a negative manual value to output the value at the outputs for cooling.
5. Click the
icon.
The manual value is written to the CPU and immediately goes into effect.
Clear the "Manual mode" check box if the output value is to be specified again by the PID
controller.
The switchover to automatic mode is bumpless.
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