PLCs - Programmable Logic Controllers

A PLC (programmable logic controller) is an industrial digital computer designed for the control of manufacturing processes or robotic devices where reliability control, simple programming and fault diagnosis is necessary. They were originally built to replace electromechanical relay systems in industrial automation.

A CPU (central processing unit) forms part of the PLC system. PLC CPUs are microprocessor-based and act as the electronic circuitry within an industrial computer. They carry out instructions from the computer program, performing basic mathematical, logical, control, input and output operations.

What are PLCs used for?

PLC controllers are important for the correct functioning of machinery in manufacturing and industry. They are used in the automation of electromechanical processes, including control of machinery on assembly lines, amusement rides, or lighting fixtures. PLCs are ideal for applications that require constant monitoring of input devices whilst allowing decisions to be made via a custom program. This ultimately enables it to control an output.

Types of PLCs

Programmable logic controllers are divided into small, medium and large modular categories. Small control systems are robust, compact and mountable on top of or beside the equipment to be controlled. Medium controllers mainly use rack mounting or backplane systems, allowing for simple upgrading via additional function cards. Large systems are necessary for applications where complex control functions are executed, usually in large plants, in machinery requiring constant monitoring, or control of other PLC hardware.

What setups are suitable for programmable logic controllers?

PLCs feature a modular design, making them suitable for use in a wide range of applications. Due to the modular aspect, PLCs can be plugged into numerous setups making them highly versatile.


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Description Prix For Use With Manufacturer Series Number of Inputs Number of Digital Inputs Output Type Input Type Number of Analogue Inputs Voltage Category Number of Digital Outputs Number of Analogue Outputs Interface Kit Included Number of Outputs Network Type
N° de stock RS 468-4242
Référence fabricantSR3B261BD
221,60 €
Each
Unité
- Zelio Logic 16 - Relay Analogue, Discrete - - - - - - 10 -
N° de stock RS 806-6812
Référence fabricantTM221CE40T
340,44 €
Each
Unité
- Modicon M221 - - Digital - - - - - - Yes - Ethernet, ModBus, Profibus DP, USB
N° de stock RS 479-8082
Référence fabricantSR2E121BD
95,20 €
Each
Unité
- Zelio Logic 8 - Relay Analogue, Discrete - - - - - - 4 -
N° de stock RS 528-8643
Référence fabricantTWDLCAE40DRF
930,71 €
Each
Unité
- Twido 24 - Relay, Transistor Sink, Source - - - - - - 16 Ethernet
N° de stock RS 468-4292
Référence fabricantSR3XT141BD
81,30 €
Each
Unité
Zelio Logic Modules Zelio Logic 8 - Relay Discrete - - - - - - 6 -
N° de stock RS 479-6070
127,80 €
Each
Unité
- Zelio Logic 8 - Relay Discrete - - - - - - 4 -
N° de stock RS 806-6828
Référence fabricantTM221CE24R
246,10 €
Each
Unité
- Modicon M221 - - Digital - - - - - - Yes - -
N° de stock RS 444-4460
Référence fabricantTWDLMDA40DTK
493,30 €
Each
Unité
- Twido - - Analogue, Transistor - - - - - - - 16 DeviceNet
N° de stock RS 468-4438
Référence fabricantSR2B121BD
113,30 €
Each
Unité
- Zelio Logic 8 - Relay Analogue, Discrete - - - - - - 4 -
N° de stock RS 468-4494
Référence fabricantSR2B201FU
186,40 €
Each
Unité
- Zelio Logic 12 - Relay Discrete - - - - - - 8 -
N° de stock RS 806-6755
Référence fabricantTM251MESE
331,60 €
Each
Unité
Modicon M251 Modicon M251 - - - - - 24 V dc - - - - - -
N° de stock RS 609-8508
Référence fabricantTSX3705028DR1
881,89 €
Each
Unité
- Modicon TSX Micro 16 - Relay Discrete - - - - - - 12 -
N° de stock RS 806-6758
Référence fabricantTM251MESC
331,60 €
Each
Unité
Modicon M251 Modicon M251 - - - - - 24 V dc - - - - - Ethernet, ModBus, Profibus DP, USB
N° de stock RS 468-4270
Référence fabricantSR3XT101BD
58,15 €
Each
Unité
Zelio Logic Modules Zelio Logic 6 - Relay Discrete - - - - - - 4 -
N° de stock RS 528-8637
Référence fabricantTWDLCAA40DRF
845,68 €
Each
Unité
- Twido 24 - Relay, Transistor Sink, Source - - - - - - 16 -
N° de stock RS 468-4258
Référence fabricantSR3B261FU
225,60 €
Each
Unité
- Zelio Logic 16 - Relay Discrete - - - - - - 10 -
N° de stock RS 468-4422
114,64 €
Each
Unité
- Zelio Logic 6 - Relay Discrete - - - - - - 4 -
N° de stock RS 479-6042
Référence fabricantSR2E121B
101,10 €
Each
Unité
- Zelio Logic 8 - Relay Discrete - - - - - - 4 -
N° de stock RS 479-6165
115,40 €
Each
Unité
- Zelio Logic 6 - Transistor Analogue, Discrete - - - - - - 4 -
N° de stock RS 468-4220
Référence fabricantSR3B101BD
117,04 €
Each
Unité
- Zelio Logic 6 - Relay Analogue, Discrete - - - - - - 4 -