Siemens S7-1200 System Manual page 438

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Table of Contents

Technology instructions

9.2 PID control

Sample configuration settings for the PID_3Step instruction

Controller type

Invert the control logic

Activate mode after

Scales both the range and the limits for the process value. If the process value goes below the low limit or

above the high limit, the PID loop goes to inactive mode and sets the output value to 0.

To use Input_PER, you must scale the analog process value (input value).

Motor transition

Minimum ON time

Selects the engineering units.

Allows selection of a reverse-acting PID loop.

If not selected, the PID loop is in direct-acting mode, and the output of PID loop

increases if the input value < setpoint).

If selected, the output of the PID loop increases if the input value > setpoint.

Restarts the PID loop after it is reset or if an input limit has been exceeded and

returned to the valid range.

Set Mode to: Defines the mode that the user wants the PID to go to after restart.

Selects either the Input parameter or the Input_PER parameter (for analog) for the

process value. Input_PER can come directly from an analog input module.

Selects either to use the digital outputs (Output_UP and Output_DN) or to use the

analog output (Output_PER) for the output value.

Selects the type of device status returned to the PID loop:

No feedback (default)

Feedback_PER

Sets the time from open to close for the valve. (Locate this value on the data sheet or

the faceplate of the valve.)

Sets the minimum movement time for the valve. (Locate this value on the data sheet or

the faceplate of the valve.)

Sets the minimum pause time for the valve. (Locate this value on the data sheet or the

faceplate of the valve.)

S7-1200 Programmable controller

System Manual, 03/2014, A5E02486680-AG