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Visualization Documentation – PID_MR Block

Usage of PID_MR Block through SCADA Template

The PID-MR (Modular PID with Manual Reset) block is used for closed-loop process control, similar to the standard PID block.
It introduces an enhanced Manual Reset (MR) feature to improve safety and control reliability during critical operations.

This block is ideal for applications where the operator must acknowledge or reset the loop before resuming automatic control.

Integrating the PID_MR Block into Visualization steps are given below:

1: Open the Visualization Page

  • Launch your CODESYS project.
  • Open the visualization page where PID-MR should be placed (e.g., Main_HMI, PIDMR_Control).

2. Insert the PID_MR Block Icon from Scada_test Visu Page

  • Open the Visualization Toolbox Go to Current Project.
  • Drag or drop the PID_MR Block icon to your Visualization page.
  • Or Just Copy the PID_MR Block Icon from the Scada_test visu page and Paste into your Visualization page.

✅ This ensures consistency and ease of reuse.

  • Select the PID_MR block icon.
  • click on the block icon Properties tab open automatically → Properties.
  • Go to the References and Expand the references.
  • you will see bl_PID_MR Expand that also.
  • set the path in front of the tagPID by Double clicking on empty space and select the required tag.
  • Build and run the project.
  • During runtime, verify that live values like PV,SV and MV functioning.

PID_MR Block - Visualization Behavior

Block Icon

  • Clicking the Tagname on the icon opens a faceplate popup.
    This includes tabs for:

  • Basic Tab – Operator view

  • Advanced Tab – Engineer view
  • Manual Reset Tab (MR) – Reset/Acknowledge functionality

Faceplate - Basic Tab

Block Icon

Shows real-time process control values and limited control buttons.

PID_MR Parameters Details – Basic Tab

Section Parameter Description
Process Values PV Measured process variable.
SP Setpoint.
MV Output signal.
Output Limits MVLO Lower output limit.
MVHI Upper output limit.
Setpoint Settings L_SP Lower bound for setpoint.
C_SP Default SP for mode switching.
SPLO Runtime lower override for SP.
SPHI Runtime upper override for SP.
PV Bar PV On the left side there is PV bar which show the PV value in visual form.
SV Bar SV On the left side there is PV bar which show the SV value in visual form.
MV Bar MV On the left side there is PV bar which show the MV value in visual form.
Mode Selector Mode Select the mode of the PID By clicking on the dropdown arrow.

Operator access to SP change may be restricted by access levels.

Faceplate - Advanced Tab

Block Icon

Used for controller tuning, input type selection, alarm limits, and behavior configuration.

PID_MR Parameters Details – Advanced Tab

Section Parameter Description
Process Value PV Real-time process variable input.
Process Value Limit PV_LO Low alarm limit for process variable.
PV_HI High alarm limit for process variable.
Alarming Limits PVLL Critical low alarm (very low limit).
PVLO Warning-level low limit.
PV HI Warning-level high limit.
PVHH Critical high alarm (very high limit).
Tuning Parameters P Proportional gain.
I Integral time.
D Derivative time.
External MV EXT_MV External Value
Control Type IN_Type Input type for PID: Linear (LIN) or Square Root (SQRT).
Control Direction OP_AT Output action: DIR or REV.
CT_AT Controller logic action: DIR or REV.
SP Tracking SP_TR Enable or disable SP tracking during manual to auto.
External MV EXT_MV Enables (EN) or disables (DIS) using value External OR original process value.

⚠️ Engineer login required to change these values. Misuse can destabilize process control.

Integration Notes

  • Ensure fb_PID_MR instance is declared in logic before binding.
  • Use user roles to hide Advanced tabs from basic operators.

Demo / Training Video

🎥 Watch Demo – TPW HMI PID-MR Block Walkthrough

This video shows how to insert, configure, and use the DACA block within a SCADA template project.

Summary

The PID_MR block provides:

  • ✅ Manual Reset before auto-mode entry
  • ✅ Engineer-level tuning and configuration
  • ✅ Process control visibility for operators

Recommended for use in critical loops where safety or operator acknowledgment is essential.