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. 862-4496
Mfr. Part No.6ES7215-1HG40-0XB0
BrandSiemens
SGD1,154.60
Each
units
SIMATIC S7-1200 Series S7-1200 - 2 switch as Analogue Input), 14 (Digital Input Analogue, Digital - - 24 V dc Digital, Relay - - Relay Output), 10 (Digital Output Ethernet -
RS Stock No. 539-0689
Mfr. Part No.FX3U-32MR/ES
BrandMitsubishi
SGD1,387.35
Each
units
- FX3U - 16 Sink/Source - - - Relay - - 16 - -
RS Stock No. 825-1685
Mfr. Part No.6ED1055-1NB10-0BA2
BrandSiemens
SGD238.74
Each
units
LOGO! 8, LOGO! 8.2 LOGO! - 8 Digital - - - Relay - - 8 - -
RS Stock No. 862-4487
Mfr. Part No.6ES7215-1AG40-0XB0
BrandSiemens
SGD1,047.66
Each
units
SIMATIC S7-1200 Series S7-1200 - 2 switch as Analogue Input), 14 (Digital Input Analogue, Digital - - 24 V dc Digital, Transistor - - Transistor Output), 10 (Digital Output Ethernet -
RS Stock No. 705-5808
Mfr. Part No.CP1E-E40DR-A
BrandOmron
SGD727.09
Each
units
CP1E Series CP1E - 24 Pulse - - 85 → 264 V ac Relay - - 16 (Relay) - -
RS Stock No. 123-2107
Mfr. Part No.0850-0700
BrandBARTH
SGD253.84
Each
units
STG-700 Lococube mini-PLC - 4 Analogue, DC Digital - - - Digital, Power Stepper Motor, Solid-State - - 6 - -
RS Stock No. 885-0929
Mfr. Part No.IS.MD42.base
SGD598.14
Each
units
- M-Duino - 26 Analogue, Digital - - 12 → 24 V dc Analogue, Digital - - 16 Ethernet, ModBus -
RS Stock No. 820-8502
Mfr. Part No.BMECRA31210
SGD2,152.21
Each
units
Modicon M580 Ethernet I/O Architecture Modicon M580 - - - - - - - - - - - -
RS Stock No. 401-589
Mfr. Part No.CP1L-L14DT1-D
BrandOmron
SGD545.63
Each
units
SYSMAC CP1L Series CP1L - 8 (DC) DC - - 20.4 → 26.4 V dc Transistor - - 6 (Transistor) USB -
RS Stock No. 825-1675
Mfr. Part No.6ED1055-1FB00-0BA2
BrandSiemens
SGD153.37
Each
units
LOGO! 8, LOGO! 8.2 LOGO! - 4 Digital - - - Relay - - 4 - -
RS Stock No. 468-4438
Mfr. Part No.SR2B121BD
SGD375.71
Each
units
- Zelio Logic - 8 Analogue, Discrete - - - Relay - - 4 - Yes
RS Stock No. 479-6064
Mfr. Part No.SR2B122BD
SGD343.52
Each
units
- Zelio Logic - 8 Analogue, Discrete - - - Transistor - - 4 - Yes
RS Stock No. 468-4472
Mfr. Part No.SR2B201BD
SGD467.24
Each
units
- Zelio Logic - 12 Analogue, Discrete - - - Relay - - 8 - Yes
RS Stock No. 818-4187
Mfr. Part No.CJ1WCIF11
BrandOmron
SGD203.86
Each
units
CJ1 Series CJ1 - - - - - 5 V - - - - - -
RS Stock No. 705-5795
Mfr. Part No.CP1E-E20DR-A
BrandOmron
SGD559.82
Each
units
CP1E Series CP1E - 12 Pulse - - 85 → 264 V ac Relay - - 8 (Relay) USB -
RS Stock No. 872-6321
Mfr. Part No.6AV2132-3GB00-0AA1
BrandSiemens
SGD1,685.52
Each
units
LOGO! 8, LOGO! 8.2 LOGO! - - Digital - - - Relay - - 4 Ethernet Yes
RS Stock No. 479-6159
Mfr. Part No.SR2B201JD
SGD370.39
Each
units
- Zelio Logic - 12 Analogue, Discrete - - - Relay - - 8 - Yes
RS Stock No. 617-0313
Mfr. Part No.FX3U-128MR/ES
BrandMitsubishi
SGD2,960.76
Each
units
- FX3U - 64 Sink/Source - - - Relay - - 64 - -
RS Stock No. 705-5811
Mfr. Part No.CP1E-N20DR-D
BrandOmron
SGD569.06
Each
units
CP1E Series CP1E - 12 Pulse - - 20.4 → 26.4 V dc Relay - - 8 (Relay) USB -
RS Stock No. 806-6755
Mfr. Part No.TM251MESE
SGD1,179.28
Each
units
Modicon M251 Modicon M251 - - - - - 24 V dc - - - - - Yes