Tank Sequences with Library Sequencer

Learn how to implement process sequencing strategies using PlantPAx and the Sequencer object, integrating control and visualization in a standardized, scalable manner that aligns with best practices. - [Implementation time: 90 minutes]

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What is this for?

This document describes the implementation of a process strategy using the Sequencer library for industrial processes using PlantPAx technologies, in conjunction with Studio 5000 Logix Designer and FactoryTalk View.

Its purpose is to serve as a practical reference guide for the development of sequence-based applications, enabling the construction of standardized, reusable, and scalable solutions, aligned with best practices in industrial automation.

Using this approach, it is possible to:

Reduce complexity during development
Improve system maintainability
Ensure consistent operation across different processes or plant units

Is this useful to me?

This solution is geared towards different profiles within the industrial environment:

Automation engineers - It allows the implementation of control strategies in a structured way using standard PlantPAx libraries, facilitating the development of modular logic that is organized and aligned with modern distributed control architectures.
Plant operators - It provides intuitive and consistent graphical interfaces for monitoring and controlling sequences, improving process visibility, reducing operational errors, and facilitating interaction with the system.

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How can I make it work?

Requirements: products, tools, prior knowledge.

To implement this solution, the following environment is required:

Hardware:
- ControlLogix/CompactLogix Controller
- HMI Station

Software:
- Studio 5000 Logix Designer
- FactoryTalk View
- PlantPAx Process Library

Implementation Guide

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Step 1

Definition of devices: valves, pumps and sensors.

Studio5000

It is assumed that the project already has the necessary equipment connected and created in the Studio5000 program, which in this case will be: 5 valves, 1 level sensor, and 2 pumps, and that these are already imported into the sequencer routine that is already within the PlantPAx libraries, named: CS_raP_Opr_Seq

tank-sequences-with-library-sequencer_Imagen2.png

Step 2

Import Sequencer routine from PlantPAx into Studio 5000.

In Studio 5000 Logix Designer:

Import from the PlantPAx libraries the routine: P_Seq (CS_raP_Opr_Seq)
Select the corresponding routine

tank-sequences-with-library-sequencer_Imagen3.png

Assign a representative name according to the process (e.g., A03_RTANK).

tank-sequences-with-library-sequencer_Imagen4.png

Step 3

Configure digital and analog inputs and outputs.

Within the created routine, the main blocks are identified:

Input Block

Signals from sensors or process conditions.

tank-sequences-with-library-sequencer_Imagen5.png

Digital output block

Valve and pump control

tank-sequences-with-library-sequencer_Imagen6.png

Analog output block

Continuous control signals

tank-sequences-with-library-sequencer_Imagen7.png

Step 4

Optimize Ladder logic for multiple devices.

For multi-device applications:

It is recommended to implement additional logic in Ladder Diagram
Group signals to optimize bit usage
Simplify integration with the sequencer

This improves scalability and facilitates maintenance.

tank-sequences-with-library-sequencer_Imagen8.png

Step 5

Develop HMI in FactoryTalk View using Global Objects.

In FactoryTalk View:

Open the HMI project
Verify that the PlantPAx libraries are available

Once the PlantPAx libraries are inside our project in View, we go to the Global Objects section and locate the project with the name: (raP-5_20-SE) Graphic Symbols - raP_Opr_Seq

tank-sequences-with-library-sequencer_Imagen9.png

Insert the sequencer graphic object into the display.

tank-sequences-with-library-sequencer_Imagen10.png

Step 6

Associate parameters between HMI and logic.

Access the option: Global Object Parameter Value.
Link the graphic object to the controller routine.

This enables interaction between HMI and control logic.

tank-sequences-with-library-sequencer_Imagen11.png

Load the project into Client.

Step 7

Check Sequencer blocks.

When we open the file for studio5000 we have the following:

tank-sequences-with-library-sequencer_Imagen12.png

Then, when we open the Normal section in the tree, we find the routine where the sequence is created, which is named A03_RTANK:

tank-sequences-with-library-sequencer_Imagen13.png

Within the program (e.g., A03_RTANK), the main blocks are found:

Tickets
Confirmation (Prompt)
Sequence motor
Digital outputs
Analog outputs

tank-sequences-with-library-sequencer_Imagen14.png

Step 8

Accessing the HMI application.

When you open the corresponding file (for example: “PlantPAx Sequencer.cli”), the main screen (Overview) appears, which displays:

General state of the system
Process indicators
Control button for executing the sequence

This screen serves as the central point of interaction for the operator.

Now, when we open the file “PlantPAx Sequencer.cli” we have the following:

tank-sequences-with-library-sequencer_Imagen15.png

In which we can see the Overview of the experience, as well as the button which we will use to start the sequence.

Step 9

Before operating the system:

Select the security icon (key) located at the top of the interface
Log in with an authorized user

This step is important because many sequencer actions require operating permissions.

tank-sequences-with-library-sequencer_Imagen16.png

Step 10

Sequencer Initialization.

Once logged in:

Press the sequence start button available on the main screen

At this point, the system is ready to execute the logic defined in the controller.

tank-sequences-with-library-sequencer_Imagen17.png

Step 11

Sequence Inspection.

To analyze the sequencer's behavior:

Select the inspection button (magnifying glass icon with document)

This allows access to the detailed view of the sequencer, where you can see:

Current states of the sequence
Configured steps
Active transitions.

tank-sequences-with-library-sequencer_Imagen18.png

Step 12

Review of sequence properties.

Within the detail view:

Access the “Starting” section (or corresponding initial stage)

Here you can review the properties of each step, including:
- Related entries
- Conditions necessary to advance to the next stage
- Digital outputs
- Actuation of valves, pumps or other devices
- Analog outputs
- Continuous control variables, if configured

This analysis allows validating the correct configuration and behavior of the process.

Step 13

Process Execution.

To execute the sequence:

Press the Start button within the sequencer interface

When running for the first time, it is recommended to validate that all initial conditions of the process are in a safe state.

Once started:

The sequencer will begin executing each step sequentially.
The transitions will depend on the conditions configured in the logic

tank-sequences-with-library-sequencer_Imagen19.png

To run the sequence, simply click the start button when opening the sequence for the first time.

Step 14

Monitoring of execution.

During the operation, it is recommended to:

Monitor progress between steps

Check for changes in:
- Inputs (sensors)
- Digital outputs (actuators)
- Analog variables

Confirm that there are no alarms or failure conditions

tank-sequences-with-library-sequencer_Imagen20.png

Tank Sequences with Library Sequencer

Version 1.0 - July 2026

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