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. 123-2106
Mfr. Part No.0850-0680
BrandBARTH
TWD5,103.00
Each
units
STG-680 - - 10 Analogue, DC Digital - - - Digital, PWM, Solid-State - - 10 - -
RS Stock No. 885-0910
Mfr. Part No.0850-0115
BrandBARTH
TWD8,491.00
Each
units
STG-115 - - 8 Analogue, Digital - - - Analogue - - 9 - Yes
RS Stock No. 885-0897
Mfr. Part No.0850-0650
BrandBARTH
TWD4,558.00
Each
units
STG-650 - - 10 Analogue, Digital - - - Digital - - 9 CAN -
RS Stock No. 885-0894
Mfr. Part No.0660-0650
BrandBARTH
TWD5,815.00
Each
units
STG-650 - - 10 Analogue, Digital - - - Digital - - 9 CAN -
RS Stock No. 864-4538
Mfr. Part No.0850-0600
BrandBARTH
TWD5,103.00
Each
units
STG-600 - - 10 Analogue, Digital - - - PWM, Solid State - - 9 - -
RS Stock No. 443-0247
Mfr. Part No.EASY-M-256K
BrandEaton
TWD1,280.00
Each
units
Easy 800 Series - - - - - - - - - - - - -
RS Stock No. 885-0907
Mfr. Part No.0850-0095
BrandBARTH
TWD7,162.00
Each
units
STG-95 - - 8 Analogue, Digital - - - Analogue - - 8 - Yes
RS Stock No. 862-4487
Mfr. Part No.6ES7215-1AG40-0XB0
BrandSiemens
TWD19,920.00
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. 705-4874
Mfr. Part No.FX3G-60MR-ES
BrandMitsubishi
TWD29,077.00
Each
units
- - - 36 Sink/Source - - - Relay - - 24 - -
RS Stock No. 806-6812
Mfr. Part No.TM221CE40T
TWD18,634.00
Each
units
- Modicon M221 - - - - - - Digital - Yes - Ethernet, ModBus, Profibus DP, USB Yes
RS Stock No. 806-6847
Mfr. Part No.TM221M16R
TWD14,086.00
Each
units
- Modicon M221 - - - - - - Digital - Yes - - Yes
RS Stock No. 781-6859
Mfr. Part No.Q00UJCPU
BrandMitsubishi
TWD16,744.00
Each
units
MELSEC Q Series Q Series - - - - - - - - - - Ethernet -
RS Stock No. 862-4471
Mfr. Part No.6ES7214-1AG40-0XB0
BrandSiemens
TWD12,335.00
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. 705-4865
Mfr. Part No.FX3G-40MR-ES
BrandMitsubishi
TWD23,569.00
Each
units
- - - 24 Sink/Source - - - Relay - - 16 - -
RS Stock No. 468-4242
Mfr. Part No.SR3B261BD
TWD9,516.00
Each
units
- - - 16 Analogue, Discrete - - - Relay - - 10 - Yes
RS Stock No. 864-4535
Mfr. Part No.0850-0500
BrandBARTH
TWD3,431.00
Each
units
STG-115 - - 5 Analogue, Digital - - - PWM, Solid State - - 5 - -
RS Stock No. 885-0888
Mfr. Part No.0850-0550
BrandBARTH
TWD3,645.00
Each
units
STG-550 - - 5 Analogue, Digital - - - Digital - - 5 CAN -
RS Stock No. 806-6755
Mfr. Part No.TM251MESE
TWD27,861.00
Each
units
Modicon M251 Modicon M251 - - - - - 24 V dc - - - - - Yes
RS Stock No. 864-4541
Mfr. Part No.0660-0600
BrandBARTH
TWD5,146.00
Each
units
STG-600 - - 10 Analogue, Digital - - - Mosfet, Solid State - - 8 - -
RS Stock No. 815-5760
Mfr. Part No.FPG-C32T2H
BrandPanasonic
TWD17,969.00
Each
units
Minas A4 Servo Drives FPG - 16 - - - 24 V dc NPN, Transistor - - 16 Ethernet, ModBus -