Timing Relay vs PLC Timer: When to Use Each
A senior-engineer comparison of hardwired timing relays and PLC software timers, covering accuracy, fail-safe independence, panel cost and when to use each.
9 min read
Technical
PLC guides
Guides and notes on industrial electrical and automation parts: selection, wiring, settings and ordering.
- Articles
- 8
- Latest
Relay vs Optocoupler for PLC Interfacing
A field-grounded comparison of electromechanical relays and optocoupler-based interfaces for PLC outputs, covering isolation mechanism, switching speed, leakage current and drive power.
9 min read
How to Select an Interface Relay for PLC Outputs
A step-by-step guide to matching PLC output type, coil voltage and current, contact rating, and socket style when selecting an interface relay.
9 min read
PLC Interface Relays: Isolating and Amplifying I/O
How PLC interface relays isolate low-power control I/O from field-side faults and amplify a milliamp signal into a load-level contact.
8 min read
Main Components of a PLC System: Complete Guide for Engineers
Master PLC system components: CPU, power supply, I/O modules, communication interfaces, and software with sizing formulas and selection tips. Shop at Stoklink.
14 min read
Main Types of Programmable Logic Controllers: A Complete PLC Guide
Compare the 5 main PLC types, IEC 61131-3 languages, scan-time sizing, and brand options to choose the right controller for your plant. Shop at Stoklink.
13 min read
What Is a Programmable Logic Controller and How Does It Work
Learn how a PLC works, including scan cycle, I/O sizing, IEC 61131-3 programming, and hardware selection for ABB, Schneider, and Siemens. Shop at Stoklink.
12 min read
Programmable Logic Controller Guide: Selection, Application, and Maintenance for Engineers
PLC selection guide for engineers covering IEC 61131 compliance, Siemens, Rockwell, Schneider, ABB comparison, scan time sizing, and wiring. Shop at Stoklink.
24 min read
Parts list
Sourcing a full parts list?
Paste your part numbers and quantities. We reply with price, stock and lead time per line.