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. 917-6370
BrandRS PRO
MYR537.86
Each
units
- - - 8 Analogue, Digital - - - Digital, Relay - - 4 ModBus Yes
RS Stock No. 917-6389
BrandRS PRO
MYR284.62
Each
units
RS PRO Logic Modules - - 8 Digital - - - Digital, Relay - - 4 ModBus -
RS Stock No. 917-6392
BrandRS PRO
MYR198.32
Each
units
RS PRO Logic Modules - - 1 TTL Level - - - RS485 Protocol (D-), RS485 Protocol (D+), RS485 Protocol (Two Wires) - - 1 ModBus -
RS Stock No. 917-6361
BrandRS PRO
MYR477.43
Each
units
- - - 8 Digital - - - Digital, Relay - - 4 ModBus Yes
RS Stock No. 917-6377
BrandRS PRO
MYR419.93
Each
units
- - - 8 Analogue, Digital - - - Digital, Relay - - 4 ModBus -
RS Stock No. 917-6383
BrandRS PRO
MYR189.38
Each
units
RS PRO Logic Modules - - 1 TTL Level - - - RS485 Protocol (D-), RS485 Protocol (D+), RS485 Protocol (Two Wires) - - 1 ModBus -
RS Stock No. 917-6399
BrandRS PRO
MYR76.91
Each
units
RS PRO Logic Modules - - - - - - - - - - - - -
RS Stock No. 917-6373
BrandRS PRO
MYR396.87
Each
units
- - - 8 Digital - - - Digital, Relay - - 4 ModBus -
RS Stock No. 917-6386
BrandRS PRO
MYR247.80
Each
units
RS PRO Logic Modules - - 8 Digital - - - Digital, Relay - - 4 ModBus -
RS Stock No. 479-8082
Mfr. Part No.SR2E121BD
MYR693.53
Each
units
- Zelio Logic - 8 Analogue, Discrete - - - Relay - - 4 - -
RS Stock No. 468-4242
Mfr. Part No.SR3B261BD
MYR1,594.56
Each
units
- Zelio Logic - 16 Analogue, Discrete - - - Relay - - 10 - Yes
RS Stock No. 705-5802
Mfr. Part No.CP1E-N20DR-A
BrandOmron
MYR1,884.19
Each
units
CP1E Series CP1E - 12 Pulse - - 85 → 264 V ac Relay - - 8 (Relay) USB -
RS Stock No. 781-6859
Mfr. Part No.Q00UJCPU
BrandMitsubishi
MYR2,592.49
Each
units
MELSEC Q Series Q Series - - - - - - - - - - Ethernet -
RS Stock No. 468-4422
MYR771.83
Each
units
- Zelio Logic - 6 Discrete - - - Relay - - 4 - Yes
RS Stock No. 825-1681
Mfr. Part No.6ED1055-1MB00-0BA2
BrandSiemens
MYR511.94
Each
units
LOGO! 8, LOGO! 8.2 LOGO! - 4 Digital - - - Relay - - 4 - -
RS Stock No. 650-2962
Mfr. Part No.ZEN-10C1DR-D-V2
BrandOmron
MYR785.32
Each
units
- - - 6 Analogue - - - Relay - - 4 - Yes
RS Stock No. 746-6523
Mfr. Part No.6ES7314-6CH04-0AB0
BrandSiemens
MYR12,270.61
Each
units
- S7-300 - 28 (24 Digital, 4 Analogue) Analogue, Digital - - 24 V dc Analogue, Digital - - 18 (16 Digital, 2 Analogue) - -
RS Stock No. 746-2880
Mfr. Part No.CJ2M-CPU31
BrandOmron
MYR5,292.88
Each
units
CJ2M Series CJ2M - - - - - 5 V dc Pulse - - - Ethernet Yes
RS Stock No. 512-5851
Mfr. Part No.CJ1M-CPU13
BrandOmron
MYR5,354.25
Each
units
SYSMAC CJ Series CJ1M - - - - - - - - - - DeviceNet -
RS Stock No. 862-4480
Mfr. Part No.6ES7214-1HG40-0XB0
BrandSiemens
MYR2,144.93
Each
units
SIMATIC S7-1200 Series S7-1200 - 14 (Digital Input, 2 switch as Analogue Input) Analogue, Digital - - 24 V dc Digital, Relay - - 10 (Digital Output, Relay Output) Ethernet -