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 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 Output Type Interface Kit Included Number of Outputs Network Type Display Included
RS Stock No. 615-2321
Mfr. Part No.SR3XT101JD
TWD3,715.00
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units
Zelio Logic Modules Zelio Logic - 6 Discrete - - - Relay - - 4 - -
RS Stock No. 478-9858
Mfr. Part No.267164 & MFD-CP8-ME
BrandEaton
TWD11,440.00
Each
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Easy800 Easy - - - - - - - - - - - -
RS Stock No. 468-7487
Mfr. Part No.3RK1400-0CE10-0AA2
BrandSiemens
TWD16,104.00
Each
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LOGO Series LOGO! - 4 Digital - - - Digital - - 4 - -
RS Stock No. 468-4264
Mfr. Part No.SR3XT61BD
TWD3,455.00
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Zelio Logic Modules Zelio Logic - 4 Discrete - - - Relay - - 2 - -
New
RS Stock No. 209-7105
Mfr. Part No.6ED1052-2CC08-0BA1
BrandSiemens
TWD3,885.00
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LOGO! 8.3 LOGO! 8 12 Analogue, Digital 4 - - Transistor - - 4 Ethernet -
RS Stock No. 704-8327
Mfr. Part No.88974041
BrandCrouzet
TWD6,125.00
Each
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CD12 Series CD12 - 8 Analogue, Digital - - - Relay - - 4 - Yes
RS Stock No. 479-8082
Mfr. Part No.SR2E121BD
TWD7,167.00
Each
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- Zelio Logic - 8 Analogue, Discrete - - - Relay - - 4 - -
RS Stock No. 815-5388
Mfr. Part No.AFPX-C14PD
BrandPanasonic
TWD10,194.00
Each
units
FP-X Series AFPX-C Series - 8 DC - - 24 V dc NPN - - 6 Ethernet -
RS Stock No. 354-297
Mfr. Part No.AL2-10MR-A
BrandMitsubishi
TWD4,680.00
Each
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- Alpha 2 - 6 Digital - - - Relay - - 4 - Yes
RS Stock No. 2550074341
Mfr. Part No.88974045
BrandCrouzet
TWD8,597.00
Each
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- - - - - - - - - - - - - -
RS Stock No. 2550074344
Mfr. Part No.88974055
BrandCrouzet
TWD11,837.00
Each
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- - - - - - - - - - - - - -
RS Stock No. 2550074351
Mfr. Part No.88974165
BrandCrouzet
TWD13,480.00
Each
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