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 Digital Inputs Number of Inputs Input Type Number of Analogue Inputs Number of Digital Outputs Voltage Category Number of Analogue Outputs Output Type Interface Kit Included Number of Outputs Network Type
RS Stock No. 536-9001
Mfr. Part No.88970161
BrandCrouzet
£220.14
Each
Units
- Millenium 3 - 16 Analogue, Digital - - - - Relay - - 10 -
RS Stock No. 123-7006
Mfr. Part No.88981136
BrandCrouzet
£427.15
Each
Units
- em4 - 12 (Digital/Analogue), 4 (Digital) Analogue, Digital - - 24 V dc - PWM, Relay - - 2 (PWM), 8 (Relay) -
RS Stock No. 536-8890
Mfr. Part No.88970041
BrandCrouzet
£121.38
Each
Units
- Millenium 3 - 8 Analogue, Digital - - - - Relay - - 4 -
RS Stock No. 614-9993
Mfr. Part No.88970021
BrandCrouzet
£101.65
Each
Units
- Millenium 3 - 8 Analogue, Digital - - - - Relay - - 4 -
RS Stock No. 536-9102
Mfr. Part No.88970231
BrandCrouzet
£82.32
Each
Units
Millenium 3 Series Millenium 3 - 8 Digital - - - - Relay - - 6 -
RS Stock No. 536-9023
Mfr. Part No.88970162
BrandCrouzet
£220.91
Each
Units
- Millenium 3 - 16 Analogue, Digital - - - - Transistor - - 10 -
RS Stock No. 742-4194
Mfr. Part No.88974080
BrandCrouzet
£186.35
Each
Units
- Millenium 3 - 8 Analogue, Digital - - - - Relay - - 4 -
RS Stock No. 704-8333
Mfr. Part No.88974161
BrandCrouzet
£262.76
Each
Units
XD26 Series XD26 - 16 Analogue, Digital - - - - Relay - - 10 -
RS Stock No. 536-8929
Mfr. Part No.88970051
BrandCrouzet
£181.96
Each
Units
- Millenium 3 - 12 Analogue, Digital - - - - Relay - - 8 -
RS Stock No. 742-4172
Mfr. Part No.88974042
BrandCrouzet
£154.28
Each
Units
- Millenium 3 - 8 Digital - - - - Transistor - - 4 -
RS Stock No. 536-9146
Mfr. Part No.88970241
BrandCrouzet
£136.72
Each
Units
Millenium 3 Series Millenium 3 - 2 Analogue, PT100 - - - - Analogue - - 2 -
RS Stock No. 818-7057
Mfr. Part No.88981103
BrandCrouzet
£308.63
Each
Units
em4 Series em4 Local - 16 Analogue, Digital - - 24 V dc - Relay, Static - - 10 Modbus with accessory
RS Stock No. 704-8321
Mfr. Part No.88974051
BrandCrouzet
£222.05
Each
Units
- Millenium 3 - 12 Analogue, Digital - - - - Relay - - 8 -
RS Stock No. 704-8327
Mfr. Part No.88974041
BrandCrouzet
£152.38
Each
Units
CD12 Series CD12 - 8 Analogue, Digital - - - - Relay - - 4 -
RS Stock No. 742-4175
Mfr. Part No.88974043
BrandCrouzet
£136.04
Each
Units
- Millenium 3 - 8 Digital - - - - Relay - - 4 -
RS Stock No. 123-7005
Mfr. Part No.88981133
BrandCrouzet
£390.72
Each
Units
- em4 - 12 (Digital/Analogue), 4 (Digital) Analogue, Digital - - 24 V dc - PWM, Relay - - 2 (PWM), 8 (Relay) -
RS Stock No. 742-4204
Mfr. Part No.88974084
BrandCrouzet
£266.41
Each
Units
XD26 Series Millenium 3 - 16 Analogue, Digital - - - - Relay - - - -
RS Stock No. 536-9124
Mfr. Part No.88970211
BrandCrouzet
£63.15
Each
Units
Millenium 3 Series Millenium 3 - 4 Digital - - - - Relay - - 2 -
RS Stock No. 536-9067
Mfr. Part No.88970321
BrandCrouzet
£94.29
Each
Units
Millenium 3 Series Millenium 3 - 6 Digital - - - - Relay - - 4 -
RS Stock No. 536-8913
Mfr. Part No.88970042
BrandCrouzet
£124.90
Each
Units
- Millenium 3 - 8 Analogue, Digital - - - - Transistor - - 4 -