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. 781-6859
Mfr. Part No.Q00UJCPU
BrandMitsubishi
SGD756.58
Each
units
MELSEC Q Series Q Series - - - - - - - - - - Ethernet -
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. 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. 705-4874
Mfr. Part No.FX3G-60MR-ES
BrandMitsubishi
SGD1,356.48
Each
units
- FX3G - 36 Sink/Source - - - Relay - - 24 - -
RS Stock No. 539-0689
Mfr. Part No.FX3U-32MR/ES
BrandMitsubishi
SGD1,370.63
Each
units
- FX3U - 16 Sink/Source - - - Relay - - 16 - -
RS Stock No. 617-0313
Mfr. Part No.FX3U-128MR/ES
BrandMitsubishi
SGD2,960.76
Each
units
- FX3U - 64 Sink/Source - - - Relay - - 64 - -
RS Stock No. 539-0702
Mfr. Part No.FX3U-48MR/ES
BrandMitsubishi
SGD1,737.38
Each
units
- FX3U - 24 Sink/Source - - - Relay - - 24 - -
RS Stock No. 781-6865
Mfr. Part No.Q02UCPU
BrandMitsubishi
SGD2,014.92
Each
units
MELSEC Q Series Q Series - 2048 - - - - - - - 8192 Ethernet -
RS Stock No. 795-7966
Mfr. Part No.FX3S-10MR-ES
BrandMitsubishi
SGD261.51
Each
units
FX3 Series FX3S - 6 DC - - 100 → 240 V ac Relay, Transistor - - 4 Ethernet, ModBus -
RS Stock No. 617-0199
Mfr. Part No.FX3U-32MT/ESS
BrandMitsubishi
SGD1,384.69
Each
units
- FX3U - 16 Sink/Source - - - Transistor - - 16 - -
RS Stock No. 875-5672
Mfr. Part No.FX5U-32MR-ES
BrandMitsubishi
SGD1,195.84
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. 617-0212
Mfr. Part No.FX3U-32MT/DSS
BrandMitsubishi
SGD1,405.42
Each
units
- FX3U - 16 Sink/Source - - - Transistor - - 16 - -
RS Stock No. 705-4931
Mfr. Part No.FX3G-24MR-DS
BrandMitsubishi
SGD957.72
Each
units
- FX3G - 14 Sink/Source - - - Relay - - 10 - -
RS Stock No. 875-5685
Mfr. Part No.FX5U-80MR-ES
BrandMitsubishi
SGD2,185.70
Each
units
MELSEC IQ-F Series IQ Platform-Compatible PLC FX5U - 40 Sink, Source - - 100 → 240 V ac Relay, Transistor - - 40 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. 781-6861
Mfr. Part No.Q01UCPU
BrandMitsubishi
SGD956.86
Each
units
MELSEC Q Series Q Series - 1024 - - - - - - - 8192 Ethernet -
RS Stock No. 705-4953
Mfr. Part No.FX3G-60MT-DSS
BrandMitsubishi
SGD1,343.05
Each
units
- FX3G - 36 Sink/Source - - - Transistor - - 24 - -
RS Stock No. 705-4865
Mfr. Part No.FX3G-40MR-ES
BrandMitsubishi
SGD1,064.97
Each
units
- FX3G - 24 Sink/Source - - - Relay - - 16 - -
RS Stock No. 442-0802
Mfr. Part No.AL2-24MR-D
BrandMitsubishi
SGD350.06
Each
units
- Alpha 2 - 15 Digital - - - Relay - - 9 - Yes
RS Stock No. 795-7972
Mfr. Part No.FX3S-30MR-ES
BrandMitsubishi
SGD630.23
Each
units
FX3 Series FX3S - 16 DC - - 100 → 240 V ac Relay, Transistor - - 14 Ethernet, ModBus -
RS Stock No. 875-5691
Mfr. Part No.FX5U-80MT-ESS
BrandMitsubishi
SGD1,896.13
Each
units
MELSEC IQ-F Series IQ Platform-Compatible PLC FX5U - 40 Sink, Source - - 100 → 240 V ac Relay, Transistor - - 40 Inverter Communication, MELSEC Communication protocol (3C/4C Frames), MELSOFT Connection, Modbus RTUI, N:N Network, Predefined Protocol Support, SLMP (3E Frame), Socket Communication -