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.

Types of PLCs

Programmable logic controllers are divided into small, medium and large 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.


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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. 468-4242
Mfr. Part No.SR3B261BD
HK$2,413.18
Each
units
- - - 16 Analogue, Discrete - - - Relay - - 10 - Yes
RS Stock No. 885-0926
Mfr. Part No.IS.MD21.base
HK$2,311.20
Each
units
- M-Duino - 13 Analogue, Digital - - 12 → 24 V dc Analogue, Digital - - 8 Ethernet, ModBus -
RS Stock No. 818-4165
Mfr. Part No.CJ1WID231CHN
BrandOmron
HK$3,290.05
Each
units
CJ1 Series CJ1 - 32 DC - - 24 V dc - - - - - -
RS Stock No. 705-4940
Mfr. Part No.FX3G-24MT-DSS
BrandMitsubishi
HK$4,678.96
Each
units
- - - 14 Sink/Source - - - Transistor - - 10 - -
RS Stock No. 539-0718
Mfr. Part No.FX3U-64MR/ES
BrandMitsubishi
HK$11,262.68
Each
units
- - - 32 Sink/Source - - - Relay - - 32 - -
RS Stock No. 815-5760
Mfr. Part No.FPG-C32T2H
BrandPanasonic
HK$4,075.40
Each
units
Minas A4 Servo Drives FPG - 16 - - - 24 V dc NPN, Transistor - - 16 Ethernet, ModBus -
RS Stock No. 864-4538
Mfr. Part No.0850-0600
BrandBARTH
HK$1,104.89
Each
units
STG-600 - - 10 Analogue, Digital - - - PWM, Solid State - - 9 - -
RS Stock No. 864-4532
Mfr. Part No.0660-0500
BrandBARTH
HK$859.98
Each
units
STG-560 - - 5 Analogue, Digital - - - Mosfet, Solid State - - 5 - -
RS Stock No. 815-5631
Mfr. Part No.AFPX-C14R
BrandPanasonic
HK$1,542.48
Each
units
FP-X Series AFPX-C Series - 8 DC - - 100 → 240 V ac Relay - - 8 Ethernet -
RS Stock No. 825-1681
Mfr. Part No.6ED1055-1MB00-0BA2
BrandSiemens
HK$1,225.97
Each
units
LOGO! 8, LOGO! 8.2 - - 4 Digital - - - Relay - - 4 - -
RS Stock No. 818-4193
Mfr. Part No.CJ1WOD231CHN
BrandOmron
HK$3,657.37
Each
units
CJ1 Series CJ1 - - - - - 12 → 24 V dc NPN - - 32 - -
RS Stock No. 862-4471
Mfr. Part No.6ES7214-1AG40-0XB0
BrandSiemens
HK$4,215.96
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. 885-0945
Mfr. Part No.IS.MD38.base
HK$4,148.21
Each
units
- M-Duino - 8 Analogue, Digital - - 12 → 24 V dc Analogue, Digital, Relay - - 22 Ethernet, ModBus -
RS Stock No. 681-8715
Mfr. Part No.BMXP342000
HK$5,918.71
Each
units
Modicon M340 Modicon M340 - - Analogue, Digital - - 24 V dc Analogue, Digital - - - Ethernet -
RS Stock No. 917-6361
BrandRS PRO
HK$904.67
Each
units
- - - 8 Digital - - - Digital, Relay - - 4 ModBus Yes
RS Stock No. 746-2884
Mfr. Part No.CJ2M-CPU33
BrandOmron
HK$11,509.90
Each
units
CJ2M Series CJ2M - - - - - 5 V dc Pulse - - - Ethernet Yes
RS Stock No. 650-2984
Mfr. Part No.ZEN-20C1DR-D-V2
BrandOmron
HK$2,547.95
Each
units
- - - 12 Analogue - - - Relay - - 8 - Yes
RS Stock No. 806-6821
Mfr. Part No.TM221CE24T
HK$4,576.63
Each
units
- Modicon M221 - - - - - - Digital - Yes - - Yes
RS Stock No. 123-2105
Mfr. Part No.0850-0580
BrandBARTH
HK$712.06
Each
units
STG-580 - - 5 Analogue, DC Digital - - - Digital, PWM, Solid-State - - 6 - -
RS Stock No. 875-5691
Mfr. Part No.FX5U-80MT-ESS
BrandMitsubishi
HK$10,824.76
Each
units
MELSEC IQ-F Series IQ Platform-Compatible PLC FX5U - 40 Sink, Source - - 100 → 240 V ac Relay, Transistor - - 40 Inverter Communication, MELSEC Communication protocol (3C/4C Frames), MELSOFT Connection, Modbus RTUI, N:N Network, Predefined Protocol Support, SLMP (3E Frame), Socket Communication -