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. 124-4308
Mfr. Part No.0850-0660
BrandBARTH
TWD4,503.00
Each
units
STG-660 - - 10 Analogue, Digital - - - Digital, PWM, Solid State - - 9 CANOpen -
RS Stock No. 806-6831
Mfr. Part No.TM221CE16T
TWD9,482.00
Each
units
- Modicon M221 - 9 Discrete - - - Digital - Yes 7 - Yes
RS Stock No. 806-6853
Mfr. Part No.TM221ME16RG
TWD16,733.00
Each
units
- Modicon M221 - - - - - - Digital - Yes - - Yes
RS Stock No. 806-6786
Mfr. Part No.TM241C40U
TWD18,252.00
Each
units
- Modicon M241 - 24 - - - 24 V Transistor - - 16 Ethernet, ModBus, Profibus DP, USB Yes
RS Stock No. 806-6774
Mfr. Part No.TM241C40R
TWD27,482.00
Each
units
- Modicon M241 - 24 - - - 100 → 240 V Relay - - 16 Ethernet, ModBus, Profibus DP, USB Yes
RS Stock No. 442-0795
Mfr. Part No.AL2-24MR-A
BrandMitsubishi
TWD8,454.00
Each
units
- - - 15 Digital - - - Relay - - 9 - Yes
RS Stock No. 806-6777
Mfr. Part No.TM241CE40T
TWD29,331.00
Each
units
- Modicon M241 - 24 - - - 24 V Transistor - - 16 Ethernet, ModBus, Profibus DP, USB Yes
RS Stock No. 806-6799
Mfr. Part No.TM241CE24T
TWD24,611.00
Each
units
- Modicon M241 - 14 - - - 24 V Transistor - - 10 - Yes
RS Stock No. 781-6861
Mfr. Part No.Q01UCPU
BrandMitsubishi
TWD21,176.00
Each
units
MELSEC Q Series Q Series - 1024 - - - - - - - 8192 Ethernet -
RS Stock No. 806-6856
Mfr. Part No.TM221M16RG
TWD12,237.00
Each
units
- Modicon M221 - - - - - - Digital - Yes - - Yes
RS Stock No. 705-4931
Mfr. Part No.FX3G-24MR-DS
BrandMitsubishi
TWD18,324.00
Each
units
- - - 14 Sink/Source - - - Relay - - 10 - -
RS Stock No. 885-0923
Mfr. Part No.IS.MD58.base
TWD14,481.00
Each
units
- M-Duino - 36 Analogue, Digital - - 12 → 24 V dc Analogue, Digital - - 22 Ethernet, ModBus -
RS Stock No. 770-2368
Mfr. Part No.TM258LF42DT
TWD74,331.00
Each
units
Modicon M258 Modicon M258 - 26 Digital - - 24 V dc Digital - - 16 Ethernet -
RS Stock No. 617-0329
Mfr. Part No.FX3U-128MT/ESS
BrandMitsubishi
TWD65,524.00
Each
units
- - - 64 Sink/Source - - - Transistor - - 64 - -
RS Stock No. 787-7992
Mfr. Part No.6ES7314-6BH04-0AB0
BrandSiemens
TWD70,070.00
Each
units
SIMATIC S7-300 Series S7-300 - 4 (Analogue), 24 (Digital) Analogue, Digital - - 24 V dc Analogue, Digital - - 2 (Analogue), 16 (Digital) USB -
RS Stock No. 617-0234
Mfr. Part No.FX3U-48MR/DS
BrandMitsubishi
TWD38,986.00
Each
units
- - - 24 Sink/Source - - - Relay - - 24 - -
RS Stock No. 442-0802
Mfr. Part No.AL2-24MR-D
BrandMitsubishi
TWD8,454.00
Each
units
- - - 15 Digital - - - Relay - - 9 - Yes
RS Stock No. 746-2880
Mfr. Part No.CJ2M-CPU31
BrandOmron
TWD47,388.00
Each
units
CJ2M Series CJ2M - - - - - 5 V dc Pulse - - - Ethernet Yes
RS Stock No. 806-6792
Mfr. Part No.TM241CE24U
TWD25,364.00
Each
units
- Modicon M241 - 14 - - - 24 V Transistor - - 10 Ethernet, ModBus, Profibus DP, USB Yes
RS Stock No. 806-6862
Mfr. Part No.TM221M16T
TWD15,108.00
Each
units
- Modicon M221 - - - - - - Digital - Yes - Ethernet, ModBus, Profibus DP, USB Yes