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. 781-6865
Mfr. Part No.Q02UCPU
BrandMitsubishi
SGD2,085.24
Each
units
MELSEC Q Series Q Series - 2048 - - - - - - - 8192 Ethernet -
RS Stock No. 401-428
Mfr. Part No.CP1L-M40DR-A
BrandOmron
SGD1,130.24
Each
units
SYSMAC CP1L Series CP1L - 24 (DC) DC - - 85 → 264 V ac Relay - - 16 (Relay) USB -
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. 862-4465
Mfr. Part No.6ES7212-1AE40-0XB0
BrandSiemens
SGD434.73
Each
units
SIMATIC S7-1200 Series S7-1200 - 2 switch as Analogue Input), 8 (Digital Input Analogue, Digital - - 24 V dc Digital, Transistor - - Transistor Output), 6 (Digital Output Ethernet -
RS Stock No. 468-4450
Mfr. Part No.SR2B121FU
SGD364.15
Each
units
- Zelio Logic - 8 Discrete - - - Relay - - 4 - Yes
RS Stock No. 479-6058
Mfr. Part No.SR2B121JD
SGD406.05
Each
units
- Zelio Logic - 8 Analogue, Discrete - - - Relay - - 4 - Yes
RS Stock No. 815-5401
Mfr. Part No.AFP0RC32T
BrandPanasonic
SGD562.22
Each
units
FP0R Series AFPOR Series - 16 Sink, Source - - 24 V dc NPN - - 16 Ethernet Yes
RS Stock No. 917-6386
BrandRS PRO
SGD84.51
Each
units
RS PRO Logic Modules - - 8 Digital - - - Digital, Relay - - 4 ModBus -
RS Stock No. 763-1002
Mfr. Part No.1SAP186200R0004 TA574-D-T-ETH
BrandABB
SGD1,266.14
Each
units
AC500-eCo Series AC500-eC0 8 8 Digital - 6 24 V dc Digital - Yes 6 Ethernet -
RS Stock No. 468-4220
Mfr. Part No.SR3B101BD
SGD423.32
Each
units
- Zelio Logic - 6 Analogue, Discrete - - - Relay - - 4 - Yes
RS Stock No. 795-7966
Mfr. Part No.FX3S-10MR-ES
BrandMitsubishi
SGD263.46
Each
units
FX3 Series FX3S - 6 DC - - 100 → 240 V ac Relay, Transistor - - 4 Ethernet, ModBus -
RS Stock No. 917-6373
BrandRS PRO
SGD139.40
Each
units
- - - 8 Digital - - - Digital, Relay - - 4 ModBus -
RS Stock No. 468-4494
Mfr. Part No.SR2B201FU
SGD570.00
Each
units
- Zelio Logic - 12 Discrete - - - Relay - - 8 - Yes
RS Stock No. 528-8637
Mfr. Part No.TWDLCAA40DRF
SGD1,298.24
Each
units
- Twido - 24 Sink/Source - - - Relay, Transistor - - 16 - Yes
RS Stock No. 534-9423
Mfr. Part No.VW3A3201
SGD284.12
Each
units
Altivar Series Altivar ATV71 - - - - - - - - - - - -
RS Stock No. 862-4483
Mfr. Part No.6ES7215-1BG40-0XB0
BrandSiemens
SGD1,093.21
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. 468-4501
Mfr. Part No.SR2PACKBD
SGD344.26
Each
units
Zelio 2 Zelio Logic 2 - Up → 4 Analogue), 8 (Up → 8 Digital Analogue, Digital - - 24 V dc Relay - Yes 4 (Relay) - Yes
RS Stock No. 825-1688
Mfr. Part No.6ED1055-1HB00-0BA2
BrandSiemens
SGD137.10
Each
units
LOGO! 8, LOGO! 8.2 LOGO! - 4 Digital - - - Relay - - 4 - -
RS Stock No. 875-5672
Mfr. Part No.FX5U-32MR-ES
BrandMitsubishi
SGD1,255.63
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. 468-4517
Mfr. Part No.SR2PACKFU
SGD351.70
Each
units
Zelio 2 Zelio Logic 2 - 8 (Digital) Digital - - 100 → 240 V ac Relay - Yes 4 (Relay) - Yes