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. 806-6761
Mfr. Part No.TM241CEC24T
TWD28,733.00
Each
units
- Modicon M241 - 14 - - - 24 V Transistor - - 10 - Yes
RS Stock No. 917-6361
BrandRS PRO
TWD3,331.00
Each
units
- - - 8 Digital - - - Digital, Relay - - 4 ModBus Yes
RS Stock No. 864-4532
Mfr. Part No.0660-0500
BrandBARTH
TWD3,817.00
Each
units
STG-560 Lococube mini-PLC - 5 Analogue, Digital - - - Mosfet, Solid State - - 5 - -
RS Stock No. 815-5760
Mfr. Part No.FPG-C32T2H
BrandPanasonic
TWD19,532.00
Each
units
Minas A4 Servo Drives FPG - 16 - - - 24 V dc NPN, Transistor - - 16 Ethernet, ModBus -
RS Stock No. 806-6871
Mfr. Part No.TM221ME32TK
TWD17,817.00
Each
units
- Modicon M221 - - - - - - Digital - Yes - Ethernet, ModBus, Profibus DP, USB Yes
RS Stock No. 872-6321
Mfr. Part No.6AV2132-3GB00-0AA1
BrandSiemens
TWD34,192.00
Each
units
LOGO! 8, LOGO! 8.2 LOGO! - - Digital - - - Relay - - 4 Ethernet Yes
RS Stock No. 917-6370
BrandRS PRO
TWD3,354.00
Each
units
- - - 8 Analogue, Digital - - - Digital, Relay - - 4 ModBus Yes
RS Stock No. 124-4307
Mfr. Part No.0850-0560
BrandBARTH
TWD3,431.00
Each
units
STG-560 Lococube mini-PLC - 5 Analogue, Digital - - - Digital, PWM, Solid State - - 5 CANOpen -
RS Stock No. 806-6815
Mfr. Part No.TM221C40R
TWD16,294.00
Each
units
- Modicon M221 - - - - - - Digital - Yes - - Yes
RS Stock No. 705-4938
Mfr. Part No.FX3G-60MR-DS
BrandMitsubishi
TWD32,631.00
Each
units
- FX3G - 36 Sink/Source - - - Relay - - 24 - -
RS Stock No. 539-0673
Mfr. Part No.FX3U-16MR/ES
BrandMitsubishi
TWD22,799.00
Each
units
- FX3U - 8 Sink/Source - - - Relay - - 8 - -
RS Stock No. 872-6328
Mfr. Part No.6AV2132-0KA00-0AA1
BrandSiemens
TWD19,513.00
Each
units
LOGO! 8, LOGO! 8.2 LOGO! - - Digital - - - Relay - - 4 Ethernet Yes
RS Stock No. 806-6837
Mfr. Part No.TM221CE16R
TWD10,229.00
Each
units
- Modicon M221 - 9 Discrete - - - Digital - Yes 7 - -
RS Stock No. 468-4309
Mfr. Part No.SR3XT61FU
TWD3,404.00
Each
units
Zelio Logic Modules Zelio Logic - 4 Discrete - - - Relay - - 2 - -
RS Stock No. 468-4523
Mfr. Part No.SR2PACK2BD
TWD17,390.00
Each
units
Zelio 2 Zelio Logic 2 - Up → 6 Analogue), 12 (Up → 12 Digital Analogue, Digital - - 24 V dc Relay - Yes 8 (Relay) - Yes
RS Stock No. 539-0689
Mfr. Part No.FX3U-32MR/ES
BrandMitsubishi
TWD30,951.00
Each
units
- FX3U - 16 Sink/Source - - - Relay - - 16 - -
RS Stock No. 862-4483
Mfr. Part No.6ES7215-1BG40-0XB0
BrandSiemens
TWD20,666.00
Each
units
SIMATIC S7-1200 Series S7-1200 - 2 switch as Analogue Input), 14 (Digital Input Analogue, Digital - - 85 → 264 V ac Digital, Relay - - Relay Output), 10 (Digital Output Ethernet -
RS Stock No. 875-5688
Mfr. Part No.FX5U-32MT-ESS
BrandMitsubishi
TWD31,404.00
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. 617-0313
Mfr. Part No.FX3U-128MR/ES
BrandMitsubishi
TWD66,179.00
Each
units
- FX3U - 64 Sink/Source - - - Relay - - 64 - -
RS Stock No. 806-6840
Mfr. Part No.TM221C16R
TWD7,325.00
Each
units
- Modicon M221 - - - - - - Digital - - - - -