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 Inputs Number of Digital Inputs Output Type Input Type Number of Analogue Inputs Voltage Category Number of Digital Outputs Supply Voltage Interface Kit Included Number of Outputs Network Type
RS Stock No. 468-4242
Mfr. Part No.SR3B261BD
HK$4,194.04
Each
units
- Zelio Logic 16 - Relay Analogue, Discrete - - - 24 V dc - - 10 -
RS Stock No. 885-0926
Mfr. Part No.IS.MD21.base
HK$2,445.46
Each
units
- M-Duino 13 - Analogue, Digital Analogue, Digital - 12 → 24 V dc - - - - 8 Ethernet, ModBus
RS Stock No. 818-4165
Mfr. Part No.CJ1WID231CHN
BrandOmron
HK$4,000.59
Each
units
CJ1 Series CJ1 32 - - DC - 24 V dc - - - - - -
RS Stock No. 705-4940
Mfr. Part No.FX3G-24MT-DSS
BrandMitsubishi
HK$5,262.24
Each
units
- FX3G 14 - Transistor Sink/Source - - - 12 → 24 V dc - - 10 -
RS Stock No. 539-0718
Mfr. Part No.FX3U-64MR/ES
BrandMitsubishi
HK$12,541.28
Each
units
- FX3U 32 - Relay Sink/Source - - - 100 → 240 V ac - - 32 -
RS Stock No. 815-5760
Mfr. Part No.FPG-C32T2H
BrandPanasonic
HK$5,526.92
Each
units
Minas A4 Servo Drives FPG 16 - NPN, Transistor - - 24 V dc - - - - 16 Ethernet, ModBus
RS Stock No. 864-4538
Mfr. Part No.0850-0600
BrandBARTH
HK$1,372.93
Each
units
STG-600 Lococube mini-PLC 10 - PWM, Solid State Analogue, Digital - - - 7 → 32 V dc - - 9 -
RS Stock No. 864-4532
Mfr. Part No.0660-0500
BrandBARTH
HK$1,037.89
Each
units
STG-560 Lococube mini-PLC 5 - Mosfet, Solid State Analogue, Digital - - - 7 → 32 V dc - - 5 -
RS Stock No. 815-5631
Mfr. Part No.AFPX-C14R
BrandPanasonic
HK$2,071.30
Each
units
FP-X Series AFPX-C Series 8 - Relay DC - 100 → 240 V ac - - - - 8 Ethernet
RS Stock No. 818-4193
Mfr. Part No.CJ1WOD231CHN
BrandOmron
HK$4,447.33
Each
units
CJ1 Series CJ1 - - NPN - - 12 → 24 V dc - - - - 32 -
RS Stock No. 825-1681
Mfr. Part No.6ED1055-1MB00-0BA2
BrandSiemens
HK$1,365.15
Each
units
LOGO! 8, LOGO! 8.2 LOGO! 4 - Relay Digital - - - 12 → 24 V dc - - 4 -
RS Stock No. 862-4471
Mfr. Part No.6ES7214-1AG40-0XB0
BrandSiemens
HK$4,701.19
Each
units
SIMATIC S7-1200 Series S7-1200 2 switch as Analogue Input), 14 (Digital Input - Digital, Transistor Analogue, Digital - 24 V dc - - - - Transistor Output), 10 (Digital Output Ethernet
RS Stock No. 681-8715
Mfr. Part No.BMXP342000
HK$6,475.24
Each
units
Modicon M340 Modicon M340 - - Analogue, Digital Analogue, Digital - 24 V dc - - - - - Ethernet
RS Stock No. 746-2884
Mfr. Part No.CJ2M-CPU33
BrandOmron
HK$12,925.16
Each
units
CJ2M Series CJ2M - - Pulse - - 5 V dc - - - - - Ethernet
RS Stock No. 885-0945
Mfr. Part No.IS.MD38.base
HK$4,481.22
Each
units
- M-Duino 8 - Analogue, Digital, Relay Analogue, Digital - 12 → 24 V dc - - - - 22 Ethernet, ModBus
RS Stock No. 917-6361
BrandRS PRO
HK$1,028.48
Each
units
- - 8 - Digital, Relay Digital - - - 110 → 240 V ac - - 4 ModBus
RS Stock No. 468-4494
Mfr. Part No.SR2B201FU
HK$2,567.62
Each
units
- Zelio Logic 12 - Relay Discrete - - - 120 V ac, 240 V ac - - 8 -
RS Stock No. 650-2984
Mfr. Part No.ZEN-20C1DR-D-V2
BrandOmron
HK$3,061.49
Each
units
- ZEN 12 - Relay Analogue - - - 12 → 24 V dc - - 8 -
RS Stock No. 806-6821
Mfr. Part No.TM221CE24T
HK$5,044.06
Each
units
- Modicon M221 - - Digital - - - - - - Yes - -
RS Stock No. 885-0954
Mfr. Part No.IS.MD57.base
HK$5,397.85
Each
units
- M-Duino 18 - Analogue, Digital, Relay Analogue, Digital - 12 → 24 V dc - - - - 31 Ethernet, ModBus