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. 825-1679
Mfr. Part No.6ED1055-1FB10-0BA2
BrandSiemens
SGD150.20
Each
units
LOGO! 8, LOGO! 8.2 LOGO! - 8 Digital - - - Relay - - 8 - -
RS Stock No. 479-6238
Mfr. Part No.SR3XT141B
SGD167.98
Each
units
Zelio Logic Modules Zelio Logic - 8 Discrete - - - Relay - - 6 - -
RS Stock No. 862-4455
Mfr. Part No.6ES7211-1BE40-0XB0
BrandSiemens
SGD292.37
Each
units
SIMATIC S7-1200 Series S7-1200 - 2 switch as Analogue Input), 6 (Digital Input Analogue, Digital - - 85 → 264 V ac Digital, Relay - - Relay Output), 4 (Digital Output Ethernet -
RS Stock No. 818-4165
Mfr. Part No.CJ1WID231CHN
BrandOmron
SGD648.28
Each
units
CJ1 Series CJ1 - 32 DC - - 24 V dc - - - - - -
RS Stock No. 885-0945
Mfr. Part No.IS.MD38.base
SGD739.82
Each
units
- M-Duino - 8 Analogue, Digital - - 12 → 24 V dc Analogue, Digital, Relay - - 22 Ethernet, ModBus -
RS Stock No. 806-6828
Mfr. Part No.TM221CE24R
SGD562.11
Each
units
- Modicon M221 - - - - - - Digital - Yes - - Yes
RS Stock No. 705-4865
Mfr. Part No.FX3G-40MR-ES
BrandMitsubishi
SGD1,129.40
Each
units
- FX3G - 24 Sink/Source - - - Relay - - 16 - -
RS Stock No. 818-4159
Mfr. Part No.CJ1WID232CHN
BrandOmron
SGD648.28
Each
units
CJ1 Series CJ1 - 32 DC - - 24 V dc - - - - - -
RS Stock No. 468-4321
Mfr. Part No.SR3XT141FU
SGD163.83
Each
units
Zelio Logic Modules Zelio Logic - 8 Discrete - - - Relay - - 6 - -
RS Stock No. 885-0897
Mfr. Part No.0850-0650
BrandBARTH
SGD213.99
Each
units
STG-650 Lococube mini-PLC - 10 Analogue, Digital - - - Digital - - 9 CAN -
RS Stock No. 917-6399
BrandRS PRO
SGD23.23
Each
units
RS PRO Logic Modules - - - - - - - - - - - - -
RS Stock No. 705-5833
Mfr. Part No.CP1E-N40DR-D
BrandOmron
SGD852.35
Each
units
CP1E Series CP1E - 24 Pulse - - 20.4 → 26.4 V dc Relay - - 16 (Relay) USB -
RS Stock No. 746-2884
Mfr. Part No.CJ2M-CPU33
BrandOmron
SGD2,506.30
Each
units
CJ2M Series CJ2M - - - - - 5 V dc Pulse - - - Ethernet Yes
RS Stock No. 862-4477
Mfr. Part No.6ES7214-1BG40-0XB0
BrandSiemens
SGD678.80
Each
units
SIMATIC S7-1200 Series S7-1200 - 2 switch as Analogue Input), 14 (Digital Input Analogue, Digital - - 85 → 264 V ac Digital, Relay - - Relay Output), 10 (Digital Output Ethernet -
RS Stock No. 746-2880
Mfr. Part No.CJ2M-CPU31
BrandOmron
SGD1,645.59
Each
units
CJ2M Series CJ2M - - - - - 5 V dc Pulse - - - Ethernet Yes
RS Stock No. 885-0910
Mfr. Part No.0850-0115
BrandBARTH
SGD389.61
Each
units
STG-115 Lococube mini-PLC - 8 Analogue, Digital - - - Analogue - - 9 - Yes
RS Stock No. 442-0802
Mfr. Part No.AL2-24MR-D
BrandMitsubishi
SGD367.56
Each
units
- Alpha 2 - 15 Digital - - - Relay - - 9 - Yes
RS Stock No. 864-4535
Mfr. Part No.0850-0500
BrandBARTH
SGD157.42
Each
units
STG-115 Lococube mini-PLC - 5 Analogue, Digital - - - PWM, Solid State - - 5 - -
RS Stock No. 885-0894
Mfr. Part No.0660-0650
BrandBARTH
SGD266.84
Each
units
STG-650 Lococube mini-PLC - 10 Analogue, Digital - - - Digital - - 9 CAN -
RS Stock No. 705-5824
Mfr. Part No.CP1E-N40DR-A
BrandOmron
SGD1,125.87
Each
units
CP1E Series CP1E - 24 Pulse - - 85 → 264 V ac Relay - - 16 (Relay) USB -