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. 705-4861
Mfr. Part No.FX3G-24MR-ES
BrandMitsubishi
TWD18,253.00
Each
units
- FX3G - 14 Sink/Source - - - Relay - - 10 - -
RS Stock No. 821-1775
Mfr. Part No.CP1L-EM40DR-D
BrandOmron
TWD31,456.00
Each
units
CP Series CP1L-EM - 24 DC - - 20.4 → 26.4 V dc Relay - - 16 Ethernet Yes
RS Stock No. 673-2810
Mfr. Part No.EASY-BOX-822-DC-USB
BrandEaton
TWD22,513.00
Each
units
Easy800 - - 12 Digital - - - Digital - - 8 - Yes
RS Stock No. 650-2934
Mfr. Part No.ZEN-10C1AR-A-V2
BrandOmron
TWD6,649.00
Each
units
- - - 6 Analogue - - - Relay - - 4 - Yes
RS Stock No. 124-4308
Mfr. Part No.0850-0660
BrandBARTH
TWD4,503.00
Each
units
STG-660 Lococube mini-PLC - 10 Analogue, Digital - - - Digital, PWM, Solid State - - 9 CANOpen -
RS Stock No. 122-1525
Mfr. Part No.0850-0570
BrandBARTH
TWD3,774.00
Each
units
STG-570 Lococube mini-PLC - 5 Analogue, Digital - - - Digital - - 5 CAN -
RS Stock No. 917-6377
BrandRS PRO
TWD2,930.00
Each
units
- - - 8 Analogue, Digital - - - Digital, Relay - - 4 ModBus -
RS Stock No. 795-7978
Mfr. Part No.FX3S-20MR-ES
BrandMitsubishi
TWD11,288.00
Each
units
FX3 Series FX3S - 12 DC - - 100 → 240 V ac Relay, Transistor - - 8 Ethernet, ModBus -
RS Stock No. 705-5802
Mfr. Part No.CP1E-N20DR-A
BrandOmron
TWD19,017.00
Each
units
CP1E Series CP1E - 12 Pulse - - 85 → 264 V ac Relay - - 8 (Relay) USB -
RS Stock No. 705-5808
Mfr. Part No.CP1E-E40DR-A
BrandOmron
TWD26,758.00
Each
units
CP1E Series CP1E - 24 Pulse - - 85 → 264 V ac Relay - - 16 (Relay) - -
RS Stock No. 825-1697
Mfr. Part No.6ED1055-1MD00-0BA2
BrandSiemens
TWD4,111.00
Each
units
LOGO! 8, LOGO! 8.2 LOGO! - 2 Analogue Pt100/1000 - - - - - - - - -
RS Stock No. 806-6819
Mfr. Part No.TM221C40T
TWD19,914.00
Each
units
- Modicon M221 - - - - - - Digital - Yes - Ethernet, ModBus, Profibus DP, USB Yes
RS Stock No. 806-6796
Mfr. Part No.TM241C24R
TWD24,223.00
Each
units
- Modicon M241 - 14 - - - 100 → 240 V Relay - - 10 - Yes
RS Stock No. 123-2105
Mfr. Part No.0850-0580
BrandBARTH
TWD3,774.00
Each
units
STG-580 Lococube mini-PLC - 5 Analogue, DC Digital - - - Digital, PWM, Solid-State - - 6 - -
RS Stock No. 806-6843
Mfr. Part No.TM221C16T
TWD13,978.00
Each
units
- Modicon M221 - - - - - - Digital - Yes - ModBus Yes
RS Stock No. 806-6825
Mfr. Part No.TM221C24R
TWD16,192.00
Each
units
- Modicon M221 - - - - - - Digital - Yes - - Yes
RS Stock No. 760-9266
Mfr. Part No.ZEN-CIF01
BrandOmron
TWD3,329.00
Each
units
ZEN Series ZEN - - - - - - - - - - - -
RS Stock No. 885-0904
Mfr. Part No.0850-0100
BrandBARTH
TWD7,933.00
Each
units
STG-100 Lococube mini-PLC - 8 Analogue, Digital - - - Analogue - - 12 - Yes
RS Stock No. 818-4187
Mfr. Part No.CJ1WCIF11
BrandOmron
TWD4,359.00
Each
units
CJ1 Series CJ1 - - - - - 5 V - - - - - -
RS Stock No. 872-6319
Mfr. Part No.6AV2132-0HA00-0AA1
BrandSiemens
TWD14,635.00
Each
units
LOGO! 8, LOGO! 8.2 LOGO! - - Digital - - - Relay - - 4 Ethernet Yes