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. You can find out more in our complete PLCs guide.

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 Price 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
RS Stock No. 442-0795
Mfr. Part No.AL2-24MR-A
BrandMitsubishi
£188.00
Each
Units
- Alpha 2 15 - Relay Digital - - - - - - 9 -
RS Stock No. 862-4480
Mfr. Part No.6ES7214-1HG40-0XB0
BrandSiemens
£369.00
Each
Units
SIMATIC S7-1200 Series S7-1200 14 (Digital Input, 2 switch as Analogue Input) - Digital, Relay Analogue, Digital - 24 V dc - - - - 10 (Digital Output, Relay Output) Ethernet
RS Stock No. 468-4472
Mfr. Part No.SR2B201BD
£181.00
Each
Units
- Zelio Logic 12 - Relay Analogue, Discrete - - - - - - 8 -
RS Stock No. 479-6064
Mfr. Part No.SR2B122BD
£118.00
Each
Units
- Zelio Logic 8 - Transistor Analogue, Discrete - - - - - - 4 -
RS Stock No. 786-7201
Mfr. Part No.2080-LC50-48QBB
£725.00
Each
Units
Micro800 Series Micro850 28 - - AC, DC 28 24 V dc - 20 Ethernet - 20 Ethernet, USB
RS Stock No. 795-7975
Mfr. Part No.FX3S-14MR-ES
BrandMitsubishi
£189.00
Each
Units
FX3 Series FX3S 8 - Relay, Transistor DC - 100 → 240 V ac - - - - 6 Ethernet, ModBus
RS Stock No. 468-4438
Mfr. Part No.SR2B121BD
£123.00
Each
Units
- Zelio Logic 8 - Relay Analogue, Discrete - - - - - - 4 -
RS Stock No. 825-1685
Mfr. Part No.6ED1055-1NB10-0BA2
BrandSiemens
£98.00
Each
Units
LOGO! 8, LOGO! 8.2 LOGO! 8 - Relay Digital - - - - - - 8 -
RS Stock No. 750-8602
Mfr. Part No.2080-LC10-12QWB
£85.20
Each
Units
- Micro810 8 - Relay Analogue, Digital - 24 V dc - - - Yes 4 USB
RS Stock No. 705-4938
Mfr. Part No.FX3G-60MR-DS
BrandMitsubishi
£728.50
Each
Units
- FX3G 36 - Relay Sink, Source - - - - - - 24 -
RS Stock No. 750-8624
Mfr. Part No.2080-LC30-24QWB
£330.00
Each
Units
Micro800 Series Micro830 14 - Relay Digital - 24 V ac/dc - - - Yes 10 ModBus
RS Stock No. 468-4220
Mfr. Part No.SR3B101BD
£124.45
Each
Units
- Zelio Logic 6 - Relay Analogue, Discrete - - - - - - 4 -
RS Stock No. 528-8643
Mfr. Part No.TWDLCAE40DRF
£788.03
Each
Units
- Twido 24 - Relay, Transistor Sink, Source - - - - - - 16 Ethernet
RS Stock No. 872-6321
Mfr. Part No.6AV2132-3GB00-0AA1
BrandSiemens
£771.00
Each
Units
LOGO! 8, LOGO! 8.2 LOGO! - - Relay Digital - - - - - - 4 Ethernet
RS Stock No. 825-1681
Mfr. Part No.6ED1055-1MB00-0BA2
BrandSiemens
£60.00
Each
Units
LOGO! 8, LOGO! 8.2 LOGO! 4 - Relay Digital - - - - - - 4 -
RS Stock No. 442-0789
Mfr. Part No.AL2-14MR-D
BrandMitsubishi
£134.50
Each
Units
- Alpha 2 8 - Relay Analogue - - - - - - 6 -
RS Stock No. 698-7739
Mfr. Part No.1747-L552
£5,580.00
Each
Units
SLC 500 Series SLC 500 - - Digital Digital - 5 → 24 V - - Ethernet - - Ethernet
RS Stock No. 786-7213
Mfr. Part No.2080-LC50-48QWB
£725.00
Each
Units
Micro800 Series Micro850 28 - Relay AC, DC - 24 V dc - - Ethernet - 20 Ethernet, USB
RS Stock No. 468-4450
Mfr. Part No.SR2B121FU
£124.00
Each
Units
- Zelio Logic 8 - Relay Discrete - - - - - - 4 -
RS Stock No. 872-6328
Mfr. Part No.6AV2132-0KA00-0AA1
BrandSiemens
£440.00
Each
Units
LOGO! 8, LOGO! 8.2 LOGO! - - Relay Digital - - - - - - 4 Ethernet