Industrial Controls.
Straight answers.
Guides for maintenance electricians, controls engineers and system integrators who need to wire it, program it or fix it — not sit through a sales pitch.
Browse by topic
Every article is grounded in IEC, ISO and NFPA standards. No affiliate links, no paywalled specs.
Featured guides
All PLC articles →Ladder Logic Basics
Power rails, contacts, coils, rungs — how a PLC evaluates ladder logic and your first start/stop circuit.
Read guide →Structured Text vs Ladder Logic
When to choose ST over LD — syntax, use cases, migration tips and what Rockwell and Siemens recommend.
Read guide →RTD vs Thermocouple
Accuracy, range, cost and wiring — how to pick the right temperature sensor for your application.
Read guide →VFD Overvoltage Fault
Root causes of F0.04 / Ov faults — DC bus overvoltage, decel ramp, braking resistor sizing and fixes.
Read guide →Modbus RTU vs Modbus TCP
Physical layer, frame structure, addressing, latency and when to choose RS-485 over Ethernet.
Read guide →Safety Light Curtain Wiring
OSSD outputs, EDM, muting, manual reset and achieving PLd/SIL 2 — complete wiring walkthrough.
Read guide →How TerminalRow works
Research from primary sources
Every article starts with the actual standard — IEC 61131-3, ISO 13849, NFPA 79, NEC — not a vendor datasheet. We cite version numbers and clause references.
Answer-first structure
The direct answer is always in the first paragraph. Tables, diagrams and worked examples follow. You get the answer before scrolling, not after.
Corrections welcomed
If a spec changes or we got something wrong, we update and log it. Use the corrections form — factual accuracy beats article count.
Engineering tools, no sign-up required
Interactive calculators that show their working — not black-box results. Every formula is documented.
Why TerminalRow
Vendor-neutral
Every guide covers Rockwell, Siemens, AutomationDirect, Schneider, Omron and Codesys-based systems — not just one platform's marketing material.
Real worked examples
Calculations, wiring diagrams, troubleshooting tables with root causes and fixes — not just theory you already read in the manual.
Sourced & dated
Every spec is cited to a primary standard with a clause number and access date. No invented numbers, no recycled blog posts from 2014.
Standards-referenced
IEC 61131-3, ISO 13849, IEC 62061, NFPA 79, NEC, ISA-18.2 — we cite the actual clause, not a paraphrase of a paraphrase.