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Industrial Automation Troubleshooting: PLC, HMI, SCADA, Drives, Networks and Control-System Diagnostics
Paperback
Series: Industrial Troubleshooting
Publisher: Independently Published
Published: Jul 15 2026
Pages: 236
Weight: 0.71
Height: 0.50 Width: 6.00 Depth: 9.00
Language: English
PLC, HMI, SCADA, Drives, Networks and Control-System Diagnostics
When an automated machine stops, the first visible symptom is rarely the true cause.
A PLC output may be active while the device does not move. An HMI may display Ready while the drive remains blocked. Remote I/O may disconnect only during machine movement. A safety system may reset correctly while the standard control system remains locked. These are not simple component failures. They are system-level faults that demand structured diagnosis, reliable evidence, and a clear understanding of how industrial automation devices interact.
Industrial Automation Troubleshooting is a hands-on guide for maintenance technicians, industrial electricians, automation engineers, PLC programmers, commissioning specialists, and field service professionals who need to diagnose complex machine failures quickly, safely, and methodically.
Rather than filling pages with basic theory, this book is built around 42 realistic industrial troubleshooting cases involving PLC systems, HMI panels, SCADA platforms, variable-frequency drives, servo systems, industrial networks, remote I/O, safety circuits, sensors, actuators, control power supplies, and difficult intermittent faults.
Every case follows a clear and repeatable diagnostic structure:
Fault → Symptoms → Safety Checks → Diagnostic Hypotheses → Measurements → Evidence → Root Cause → Repair → Verification → Prevention
You will learn how to:
- trace commands, feedback signals, interlocks, permissives, and machine sequences;
- distinguish PLC problems from field-device, wiring, mechanical, and communication faults;
- diagnose unstable 24 VDC supplies, voltage drops, grounding faults, shielding problems, and electrical interference;
- identify HMI tag errors, frozen SCADA values, failed recipe transfers, misleading alarms, and incorrect status indications;
- troubleshoot drive start failures, incorrect speed references, STO conditions, motor overloads, and servo positioning problems;
- investigate duplicate IP addresses, damaged Ethernet cables, frozen gateway data, Modbus word-order errors, and intermittent network loss;
- capture faults that appear only under heat, vibration, moisture, movement, or production load;
- perform effective root cause analysis instead of replacing parts by guesswork;
- verify repairs under real operating conditions and prevent recurring failures.
Where useful, the cases include short PLC logic examples, Structured Text fragments, HMI tag mappings, drive control words, status words, alarm records, raw communication values, timing traces, measured voltages, and practical diagnostic observations.
This is not another general introduction to PLC programming, HMI development, or industrial networking. It is a field-focused troubleshooting manual for the failures that occur between connected automation systems-the situations where every individual device appears healthy, yet the machine still refuses to run.
Whether you maintain production lines, robotic cells, packaging machines, conveyor systems, process equipment, motor-control installations, or industrial control panels, this book provides a systematic, field-proven method for reducing downtime, avoiding unnecessary parts replacement, finding the true root cause, completing reliable repairs, and returning equipment to service with confidence.
Stop guessing. Measure, prove, repair, verify.
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