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 Inputs Number of Digital Inputs Output Type Input Type Number of Analogue Inputs Voltage Category Number of Digital Outputs Interface Kit Included Number of Outputs Network Type Display Included
RS Stock No. 864-4538
Mfr. Part No.0850-0600
BrandBARTH
$260.68
Each
units
STG-600 Lococube mini-PLC 10 - PWM, Solid State Analogue, Digital - - - - - 9 - -
RS Stock No. 354-297
Mfr. Part No.AL2-10MR-A
BrandMitsubishi
$299.07
Each
units
- Alpha 2 6 - Relay Digital - - - - - 4 - Yes
RS Stock No. 806-6837
Mfr. Part No.TM221CE16R
$658.40
Each
units
- Modicon M221 9 - Digital Discrete - - - - Yes 7 - -
RS Stock No. 815-5397
Mfr. Part No.AFP0RC14RS
BrandPanasonic
$359.65
Each
units
FP0R Series AFPOR Series 8 - Relay Sink, Source - 24 V dc - - - 6 Ethernet Yes
RS Stock No. 442-0789
Mfr. Part No.AL2-14MR-D
BrandMitsubishi
$330.59
Each
units
- Alpha 2 8 - Relay Analogue - - - - - 6 - Yes
RS Stock No. 875-5688
Mfr. Part No.FX5U-32MT-ESS
BrandMitsubishi
$1,415.61
Each
units
MELSEC IQ-F Series IQ Platform-Compatible PLC FX5U 16 - Relay, Transistor Sink, Source - 100 → 240 V ac - - - 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. 442-0795
Mfr. Part No.AL2-24MR-A
BrandMitsubishi
$574.79
Each
units
- Alpha 2 15 - Relay Digital - - - - - 9 - Yes
RS Stock No. 468-4242
Mfr. Part No.SR3B261BD
$791.56
Each
units
- Zelio Logic 16 - Relay Analogue, Discrete - - - - - 10 - Yes
RS Stock No. 442-0802
Mfr. Part No.AL2-24MR-D
BrandMitsubishi
$519.98
Each
units
- Alpha 2 15 - Relay Digital - - - - - 9 - Yes
RS Stock No. 821-1750
Mfr. Part No.CP1L-EL20DR-D
BrandOmron
$821.55
Each
units
CP Series CP1L-EL 12 - Relay DC - 20.4 → 26.4 V dc - - - 8 Ethernet Yes
RS Stock No. 864-4541
Mfr. Part No.0660-0600
BrandBARTH
$262.87
Each
units
STG-600 Lococube mini-PLC 10 - Mosfet, Solid State Analogue, Digital - - - - - 8 - -
RS Stock No. 468-4258
Mfr. Part No.SR3B261FU
$1,077.68
Each
units
- Zelio Logic 16 - Relay Discrete - - - - - 10 - Yes
RS Stock No. 468-4438
Mfr. Part No.SR2B121BD
$442.93
Each
units
- Zelio Logic 8 - Relay Analogue, Discrete - - - - - 4 - Yes
RS Stock No. 812-9819
Mfr. Part No.FT1A-H24RA
BrandIdec
$869.75
Each
units
- FT1A 16 - Relay Sink - 24 V dc - - - 8 Ethernet -
RS Stock No. 468-4450
Mfr. Part No.SR2B121FU
$571.56
Each
units
- Zelio Logic 8 - Relay Discrete - - - - - 4 - Yes
RS Stock No. 479-6058
Mfr. Part No.SR2B121JD
$638.59
Each
units
- Zelio Logic 8 - Relay Analogue, Discrete - - - - - 4 - Yes
RS Stock No. 862-4474
Mfr. Part No.6ES7212-1HE40-0XB0
BrandSiemens
$528.10
Each
units
SIMATIC S7-1200 Series S7-1200 2 switch as Analogue Input), 8 (Digital Input - Digital, Relay Analogue, Digital - 24 V dc - - - Relay Output), 6 (Digital Output Ethernet -
RS Stock No. 479-6064
Mfr. Part No.SR2B122BD
$307.50
Each
units
- Zelio Logic 8 - Transistor Analogue, Discrete - - - - - 4 - Yes
RS Stock No. 681-8715
Mfr. Part No.BMXP342000
$2,701.03
Each
units
Modicon M340 Modicon M340 - - Analogue, Digital Analogue, Digital - 24 V dc - - - - Ethernet -
RS Stock No. 872-6321
Mfr. Part No.6AV2132-3GB00-0AA1
BrandSiemens
$1,834.32
Each
units
LOGO! 8, LOGO! 8.2 LOGO! - - Relay Digital - - - - - 4 Ethernet Yes