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. 401-545
Mfr. Part No.CP1L-M30DT1-D
BrandOmron
SGD976.99
Each
units
SYSMAC CP1L Series CP1L - 18 (DC) DC - - 20.4 → 26.4 V dc Transistor - - 12 (Transistor) USB -
RS Stock No. 882-0329
Mfr. Part No.750-882
BrandWago
SGD914.87
Each
units
750 Series - - - - - - - - - - - - -
RS Stock No. 528-8643
Mfr. Part No.TWDLCAE40DRF
SGD1,634.25
Each
units
- Twido - 24 Sink/Source - - - Relay, Transistor - - 16 Ethernet Yes
RS Stock No. 468-4539
Mfr. Part No.SR2PACK2FU
SGD483.20
Each
units
Zelio 2 Zelio Logic 2 - 12 (Digital) Digital - - 100 → 240 V ac Relay - Yes 8 (Relay) - Yes
RS Stock No. 124-4307
Mfr. Part No.0850-0560
BrandBARTH
SGD157.42
Each
units
STG-560 Lococube mini-PLC - 5 Analogue, Digital - - - Digital, PWM, Solid State - - 5 CANOpen -
RS Stock No. 617-0199
Mfr. Part No.FX3U-32MT/ESS
BrandMitsubishi
SGD1,433.02
Each
units
- FX3U - 16 Sink/Source - - - Transistor - - 16 - -
RS Stock No. 917-6392
BrandRS PRO
SGD67.63
Each
units
RS PRO Logic Modules - - 1 TTL Level - - - RS485 Protocol (D+), RS485 Protocol (D-), RS485 Protocol (Two Wires) - - 1 ModBus -
RS Stock No. 272-319
Mfr. Part No.AL2-10MR-D
SGD217.90
Each
units
- Alpha 2 - 6 Digital - - - Relay - - 4 - Yes
RS Stock No. 917-6389
BrandRS PRO
SGD85.96
Each
units
RS PRO Logic Modules - - 8 Digital - - - Digital, Relay - - 4 ModBus -
RS Stock No. 825-1694
Mfr. Part No.6ED1055-1MA00-0BA2
BrandSiemens
SGD175.10
Each
units
LOGO! 8, LOGO! 8.2 LOGO! - 2 Analogue - - - - - - - - -
RS Stock No. 872-6328
Mfr. Part No.6AV2132-0KA00-0AA1
BrandSiemens
SGD912.49
Each
units
LOGO! 8, LOGO! 8.2 LOGO! - - Digital - - - Relay - - 4 Ethernet Yes
RS Stock No. 705-5805
Mfr. Part No.CP1E-E30DR-A
BrandOmron
SGD597.27
Each
units
CP1E Series CP1E - 18 Pulse - - 85 → 264 V ac Relay - - 12 (Relay) - -
RS Stock No. 617-0212
Mfr. Part No.FX3U-32MT/DSS
BrandMitsubishi
SGD1,433.02
Each
units
- FX3U - 16 Sink/Source - - - Transistor - - 16 - -
RS Stock No. 123-2106
Mfr. Part No.0850-0680
BrandBARTH
SGD234.16
Each
units
STG-680 Lococube mini-PLC - 10 Analogue, DC Digital - - - Digital, PWM, Solid-State - - 10 - -
RS Stock No. 825-1691
Mfr. Part No.6ED1055-1MM00-0BA2
BrandSiemens
SGD243.56
Each
units
LOGO! 8, LOGO! 8.2 LOGO! - - - - - - Analogue - - 2 - -
RS Stock No. 917-6361
BrandRS PRO
SGD171.29
Each
units
- - - 8 Digital - - - Digital, Relay - - 4 ModBus Yes
RS Stock No. 821-1766
Mfr. Part No.CP1L-EM30DT1-D
BrandOmron
SGD1,029.04
Each
units
CP Series CP1L-EM - 18 DC - - 20.4 → 26.4 V dc PNP - - 12 Ethernet Yes
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. 815-5397
Mfr. Part No.AFP0RC14RS
BrandPanasonic
SGD285.66
Each
units
FP0R Series AFPOR Series - 8 Sink, Source - - 24 V dc Relay - - 6 Ethernet Yes
RS Stock No. 479-6238
Mfr. Part No.SR3XT141B
SGD167.98
Each
units
Zelio Logic Modules Zelio Logic - 8 Discrete - - - Relay - - 6 - -