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. 479-8082
Mfr. Part No.SR2E121BD
MYR719.25
Each
units
- Zelio Logic - 8 Analogue, Discrete - - - Relay - - 4 - -
RS Stock No. 468-4242
Mfr. Part No.SR3B261BD
MYR1,800.89
Each
units
- Zelio Logic - 16 Analogue, Discrete - - - Relay - - 10 - Yes
RS Stock No. 468-4422
MYR784.77
Each
units
- Zelio Logic - 6 Discrete - - - Relay - - 4 - Yes
RS Stock No. 615-2309
Mfr. Part No.SR3B261JD
MYR1,488.35
Each
units
- Zelio Logic - 16 Analogue, Digital - - - Relay - - 10 - Yes
RS Stock No. 479-6193
MYR1,508.64
Each
units
- Zelio Logic - 16 Discrete - - - Relay - - 10 - Yes
RS Stock No. 468-4387
Mfr. Part No.SR3PACKFU
MYR1,182.13
Each
units
Zelio 2 Zelio Logic 2 - 6 (Digital) Digital - - 100 → 240 V ac Relay - Yes 4 (Relay) - Yes
RS Stock No. 528-8643
Mfr. Part No.TWDLCAE40DRF
MYR5,611.79
Each
units
- Twido - 24 Sink/Source - - - Relay, Transistor - - 16 Ethernet Yes
RS Stock No. 468-4292
Mfr. Part No.SR3XT141BD
MYR652.62
Each
units
Zelio Logic Modules Zelio Logic - 8 Discrete - - - Relay - - 6 - -
RS Stock No. 468-4466
Mfr. Part No.SR2A201BD
MYR1,197.40
Each
units
- Zelio Logic - 12 Analogue, Discrete - - - Relay - - 8 - Yes
RS Stock No. 806-6831
Mfr. Part No.TM221CE16T
MYR1,735.16
Each
units
- Modicon M221 - 9 Discrete - - - Digital - Yes 7 - Yes
RS Stock No. 468-4450
Mfr. Part No.SR2B121FU
MYR1,024.36
Each
units
- Zelio Logic - 8 Discrete - - - Relay - - 4 - Yes
RS Stock No. 468-4488
Mfr. Part No.SR2A201FU
MYR1,230.83
Each
units
- Zelio Logic - 12 Discrete - - - Relay - - 8 - Yes
RS Stock No. 468-4523
Mfr. Part No.SR2PACK2BD
MYR1,630.77
Each
units
Zelio 2 Zelio Logic 2 - Up → 6 Analogue), 12 (Up → 12 Digital Analogue, Digital - - 24 V dc Relay - Yes 8 (Relay) - Yes
RS Stock No. 806-6815
Mfr. Part No.TM221C40R
MYR2,221.11
Each
units
- Modicon M221 - - - - - - Digital - Yes - - Yes
RS Stock No. 468-4438
Mfr. Part No.SR2B121BD
MYR1,016.11
Each
units
- Zelio Logic - 8 Analogue, Discrete - - - Relay - - 4 - Yes
RS Stock No. 806-6803
Mfr. Part No.TM221CE40R
MYR2,538.25
Each
units
- Modicon M221 - 24 Discrete - - - Digital - Yes 16 - -
RS Stock No. 468-4393
Mfr. Part No.SR3PACK2FU
MYR2,081.76
Each
units
Zelio 2 Zelio Logic 2 - 16 (Digital) Analogue, Digital - - 100 → 240 V ac Relay - Yes 10 (Relay) - Yes
RS Stock No. 468-4270
Mfr. Part No.SR3XT101BD
MYR398.79
Each
units
Zelio Logic Modules Zelio Logic - 6 Discrete - - - Relay - - 4 - -
RS Stock No. 615-2337
Mfr. Part No.SR3XT43BD
MYR847.65
Each
units
Zelio Logic Modules Zelio Logic - 3 Analogue, PT100 - - - Analogue - - 2 - -
RS Stock No. 468-4444
MYR958.27
Each
units
- Zelio Logic - 6 Discrete - - - Relay - - 4 - Yes