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
SGD145.67
Each
units
- - - 8 Analogue, Digital - - - Digital, Relay - - 4 ModBus Yes
RS Stock No. 917-6386
BrandRS PRO
SGD82.88
Each
units
RS PRO Logic Modules - - 8 Digital - - - Digital, Relay - - 4 ModBus -
RS Stock No. 917-6373
BrandRS PRO
SGD136.72
Each
units
- - - 8 Digital - - - Digital, Relay - - 4 ModBus -
RS Stock No. 917-6389
BrandRS PRO
SGD76.42
Each
units
RS PRO Logic Modules - - 8 Digital - - - Digital, Relay - - 4 ModBus -
RS Stock No. 917-6392
BrandRS PRO
SGD60.12
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
SGD163.13
Each
units
- - - 8 Digital - - - Digital, Relay - - 4 ModBus Yes
RS Stock No. 917-6399
BrandRS PRO
SGD20.64
Each
units
RS PRO Logic Modules - - - - - - - - - - - - -
RS Stock No. 917-6377
BrandRS PRO
SGD139.18
Each
units
- - - 8 Analogue, Digital - - - Digital, Relay - - 4 ModBus -
RS Stock No. 917-6383
BrandRS PRO
SGD57.41
Each
units
RS PRO Logic Modules - - 1 TTL Level - - - RS485 Protocol (D-), RS485 Protocol (D+), RS485 Protocol (Two Wires) - - 1 ModBus -
RS Stock No. 820-8479
Mfr. Part No.BMEP582020
SGD6,237.94
Each
units
Modicon M580 Modicon M580 - - Analogue - - 24 V dc - - - - Ethernet -
RS Stock No. 781-6859
Mfr. Part No.Q00UJCPU
BrandMitsubishi
SGD756.58
Each
units
MELSEC Q Series Q Series - - - - - - - - - - Ethernet -
RS Stock No. 468-4242
Mfr. Part No.SR3B261BD
SGD553.18
Each
units
- Zelio Logic - 16 Analogue, Discrete - - - Relay - - 10 - Yes
RS Stock No. 821-1775
Mfr. Part No.CP1L-EM40DR-D
BrandOmron
SGD1,154.25
Each
units
CP Series CP1L-EM - 24 DC - - 20.4 → 26.4 V dc Relay - - 16 Ethernet Yes
RS Stock No. 864-4538
Mfr. Part No.0850-0600
BrandBARTH
SGD232.60
Each
units
STG-600 lococube mini-PLC - 10 Analogue, Digital - - - PWM, Solid State - - 9 - -
RS Stock No. 875-5688
Mfr. Part No.FX5U-32MT-ESS
BrandMitsubishi
SGD1,233.10
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. 862-4499
Mfr. Part No.6ES7217-1AG40-0XB0
BrandSiemens
SGD1,374.24
Each
units
SIMATIC S7-1200 Series S7-1200 - 14 (Digital Input, 2 switch as Analogue Input) Analogue, Digital - - 24 V dc Digital, Transistor - - 10 (Digital Output, Transistor Output) Ethernet -
RS Stock No. 123-2105
Mfr. Part No.0850-0580
BrandBARTH
SGD158.25
Each
units
STG-580 lococube mini-PLC - 5 Analogue, DC Digital - - - Digital, PWM, Solid-State - - 6 - -
RS Stock No. 864-4541
Mfr. Part No.0660-0600
BrandBARTH
SGD211.10
Each
units
STG-600 lococube mini-PLC - 10 Analogue, Digital - - - Mosfet, Solid State - - 8 - -
RS Stock No. 795-7988
Mfr. Part No.FX3S-20MT-ESS
BrandMitsubishi
SGD509.39
Each
units
FX3 Series FX3S - 12 DC - - 100 → 240 V ac Relay, Transistor - - 8 Ethernet, ModBus -
RS Stock No. 885-0926
Mfr. Part No.IS.MD21.base
SGD404.26
Each
units
- M-Duino - 13 Analogue, Digital - - 12 → 24 V dc Analogue, Digital - - 8 Ethernet, ModBus -