Programmable Logic Controllers and Applications for Marine Engineers and ETOs

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Published Date

January 2020

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Programmable Logic Controllers and Applications for Marine Engineers and ETOs

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This handbook provides extensive practical information relating to PLC-based appliances that are part of, or associated with, modern marine automation. Using this book as a step-by-step guide will enable you to develop familiarity with the systems and to practise and refine your troubleshooting knowledge and fault finding skills.

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Programmable Logic Controllers (PLCs) are used in a variety of applications in the marine industry, including propulsion systems, safety systems, data acquisition and motor starters. They are reliable and require relatively little maintenance.


Marine engineers and ETOs must have a good understanding of automated systems, including PLC-based systems, in order to maintain them in a safe and operational condition. Since any onboard system can fail, fault finding also forms part of an engineer’s regular duties.


This will help you to better understand onboard applications and to develop a systematic approach in the many troubleshooting cases you are likely to encounter.


This training package is appropriate for:

  • Management level marine engineers operational level marine engineers ETOs and electricians

  • engineering cadets

  • electrical engineering cadets

  • anyone who is starting to work with PLC-based applications.


IMarEST members, please enter 'IMAREST' as Promotional Code during checkout for your members discount.


1. PLC Basics

1.1 Introduction

1.2 Power Supply Modules

1.3 The Input and Output (I/O) Interface

1.4 PLC-Based Application Terminology


2. Inputs

2.1 Sinking- and Sourcing-Input

2.2 Discrete Inputs (DI)

2.3 Input Designations

2.4 Discrete Inputs Interface Devices

2.5 Wiring Discrete Inputs

2.6 Analogue Inputs

2.7 Inputs Expansion Modules


3. Process Monitoring Analogue Sensors

3.1 Pressure Transducers

4–20 mA Pressure Transducer Characteristics

3.2 Resistance Temperature Detectors

2- wire Circuit

3- wire Circuit

4- wire Circuit

Pt100 Sensor Characteristics

Double Pt100 Sensors

Temperature Compensation for Thermocouples

3.3 NTC Thermistors

3.4 Thermocouples (TC)

3.5 Proximity Sensors

Speed Monitoring Transducers (Speed Pickups)

Electromagnetic Speed Sensors

Ferromagnetic Speed Sensors with Line Amplifier

Capacitive Proximity Sensors

Inductive Proximity Sensors

Fuel Rack Position Proximity Sensor

3.6 Feedback Potentiometers

3.7 AC Current Measuring Transducer

3.8 Analogue-to-Discrete Converters

3.9 Safety Stop Relays

3.10 Analogue-to-Analogue Signal Converters

Signal Conversion

Signal Amplification

Signal Filtering

Signal Separation


4. Outputs

4.1 Definition

Sourcing and Sinking Outputs

Output Designations

Discrete Output Interface Devices

Wiring Discrete Outputs

4.2 Protecting PLC Output Transistors

4.3 PLC Discrete I/O Status Display

4.4 Analogue Outputs


5. Flowcharts

5.1 Definition


6. Numbering Systems and Conversions

6.1 The Decimal System

6.2 The Binary System

6.3 The Octal System

6.4 The Hexadecimal (Hex) Numbering System

6.5 The Binary Coded Decimal


7. Ladder Logic

7.1 Definition

7.2 Relay Function

7.3 Impulse Relay Function

7.4 Latching Relay Function


8. Function Blocks

8.1 Definition

8.2 Logic Gates


9. PLC-based Direct-on-Line Motor Starter

9.1 Counter and Timer Instructions

Timer Instructions

Analogue Comparator Instruction

Direct-on-Line Reversing e-motor Starter LAD and FBD Program


10. PLC-based Star-Delta Motor Starter

10.1 Star-delta Motor Starter Ladder Logic and Function Blocks

10.2 Star-delta Reversing Motor Starter LAD and FBD Program


11. PLC Communication and Networking

RJ45 LED Status

Network Switch

Remote Connections 1


12. Troubleshooting PLC-based Applications

12.1 Troubleshooting PLC-Based Applications

Power Supply Check

CPU Diagnostic

Verifying the Status of PLC Discrete Inputs

Verifying the Status of PLC Discrete Output

Analogue I/O Signals Checkup and Calibration

Verifying the State of PLC Analogue Input Signal

Troubleshooting Pt100 Probe’s Related Signals

Troubleshooting Thermocouples Related Analogue Signals

Troubleshooting 4–20 mA Transducers and Related Analogue Signals

Troubleshooting Potentiometer and Related Analogue Signals

Troubleshooting Speed Monitoring Sensors and Related Analogue Signals

Troubleshooting Analogue-to-Analogue Converters

Analogue Output Checkup

12.2 PLC Application Troubleshooting

12.3 PLC-Based Application Troubleshooting Tips

Revealed Causes of Malfunctions





Title: Programmable Logic Controllers and Applications for Marine Engineers and ETOs
Number of Pages: 167
Product Code: WS1652K
ISBN: ISBN 13: 978-1-85609-812-0 (9781856098120), ISBN 10: 1-85609-812-5 (1856098125)
Published Date: January 2020
Weight: 0.90 kg
Author: Alexandr Yakimchuk

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