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. 617-0329
Mfr. Part No.FX3U-128MT/ESS
BrandMitsubishi
TWD65,524.00
Each
units
- FX3U - 64 Sink/Source - - - Transistor - - 64 - -
RS Stock No. 806-6856
Mfr. Part No.TM221M16RG
TWD12,359.00
Each
units
- Modicon M221 - - - - - - Digital - Yes - - Yes
RS Stock No. 875-5685
Mfr. Part No.FX5U-80MR-ES
BrandMitsubishi
TWD46,068.00
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 -
RS Stock No. 442-0795
Mfr. Part No.AL2-24MR-A
BrandMitsubishi
TWD8,841.00
Each
units
- Alpha 2 - 15 Digital - - - Relay - - 9 - Yes
RS Stock No. 123-2107
Mfr. Part No.0850-0700
BrandBARTH
TWD5,532.00
Each
units
STG-700 Lococube mini-PLC - 4 Analogue, DC Digital - - - Digital, Power Stepper Motor, Solid-State - - 6 - -
RS Stock No. 806-6828
Mfr. Part No.TM221CE24R
TWD12,425.00
Each
units
- Modicon M221 - - - - - - Digital - Yes - - Yes
RS Stock No. 806-6774
Mfr. Part No.TM241C40R
TWD28,857.00
Each
units
- Modicon M241 - 24 - - - 100 → 240 V Relay - - 16 Ethernet, ModBus, Profibus DP, USB Yes
RS Stock No. 806-6803
Mfr. Part No.TM221CE40R
TWD17,144.00
Each
units
- Modicon M221 - 24 Discrete - - - Digital - Yes 16 - -
RS Stock No. 862-4455
Mfr. Part No.6ES7211-1BE40-0XB0
BrandSiemens
TWD7,080.00
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. 133-260
Mfr. Part No.106394 & EC4P-221-MRXX1
BrandEaton
TWD15,890.00
Each
units
EasyControl Easy - 12 Analogue, Digital - - - Relay - - 6 CANOpen, EasyNet Yes
RS Stock No. 746-6527
Mfr. Part No.6ES7314-6EH04-0AB0
BrandSiemens
TWD86,080.00
Each
units
- S7-300 - 4 Analogue), 28 (24 Digital Analogue, Digital - - 24 V dc Analogue, Digital - - 2 Analogue), 18 (16 Digital Ethernet, Profinet -
RS Stock No. 815-5404
Mfr. Part No.AFP0RT32CT
BrandPanasonic
TWD15,057.00
Each
units
FP0R Series AFPOR Series - 16 Sink, Source - - 24 V dc NPN - - 16 Ethernet Yes
RS Stock No. 875-5691
Mfr. Part No.FX5U-80MT-ESS
BrandMitsubishi
TWD45,612.00
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 -
RS Stock No. 617-0199
Mfr. Part No.FX3U-32MT/ESS
BrandMitsubishi
TWD30,645.00
Each
units
- FX3U - 16 Sink/Source - - - Transistor - - 16 - -
RS Stock No. 806-6780
Mfr. Part No.TM241CE24R
TWD25,004.00
Each
units
- Modicon M241 - 14 - - - 100 → 240 V Relay - - 10 Ethernet, ModBus, Profibus DP, USB Yes
RS Stock No. 806-6777
Mfr. Part No.TM241CE40T
TWD30,798.00
Each
units
- Modicon M241 - 24 - - - 24 V Transistor - - 16 Ethernet, ModBus, Profibus DP, USB Yes
RS Stock No. 875-5672
Mfr. Part No.FX5U-32MR-ES
BrandMitsubishi
TWD29,406.00
Each
units
MELSEC IQ-F Series IQ Platform-Compatible PLC FX5U - 16 Sink, Source - - 100 → 240 V ac Relay, Transistor - - 16 Inverter Communication, MELSEC Communication protocol (3C/4C Frames), MELSOFT Connection, Modbus RTUI, N:N Network, Predefined Protocol Support, SLMP (3E Frame), Socket Communication -
RS Stock No. 746-2880
Mfr. Part No.CJ2M-CPU31
BrandOmron
TWD49,757.00
Each
units
CJ2M Series CJ2M - - - - - 5 V dc Pulse - - - Ethernet Yes
RS Stock No. 539-0702
Mfr. Part No.FX3U-48MR/ES
BrandMitsubishi
TWD38,835.00
Each
units
- FX3U - 24 Sink/Source - - - Relay - - 24 - -
RS Stock No. 781-6861
Mfr. Part No.Q01UCPU
BrandMitsubishi
TWD21,176.00
Each
units
MELSEC Q Series Q Series - 1024 - - - - - - - 8192 Ethernet -