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.

Types of PLCs

Programmable logic controllers are divided into small, medium and large 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.


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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. 806-6821
Mfr. Part No.TM221CE24T
TWD17,275.00
Each
units
- Modicon M221 - - - - - - Digital - Yes - - Yes
RS Stock No. 123-2107
Mfr. Part No.0850-0700
BrandBARTH
TWD5,532.00
Each
units
STG-700 - - 4 Analogue, DC Digital - - - Digital, Power Stepper Motor, Solid-State - - 6 - -
RS Stock No. 815-5397
Mfr. Part No.AFP0RC14RS
BrandPanasonic
TWD5,766.00
Each
units
FP0R Series AFPOR Series - 8 Sink, Source - - 24 V dc Relay - - 6 Ethernet Yes
RS Stock No. 806-6865
Mfr. Part No.TM221M16TG
TWD22,188.00
Each
units
- Modicon M221 - - - - - - Digital - Yes - - Yes
RS Stock No. 875-5685
Mfr. Part No.FX5U-80MR-ES
BrandMitsubishi
TWD46,249.00
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. 806-6780
Mfr. Part No.TM241CE24R
TWD25,004.00
Each
units
- Modicon M241 - 14 - - - 100 → 240 V Relay - - 10 Ethernet, ModBus, Profibus DP, USB Yes
RS Stock No. 795-7962
Mfr. Part No.FX3GE-40MR-ES
BrandMitsubishi
TWD33,792.00
Each
units
FX3 Series FX3GE - 24 DC - - 100 → 240 V ac Relay - - 16 ModBus Yes
RS Stock No. 917-6383
BrandRS PRO
TWD1,374.00
Each
units
RS PRO Logic Modules - - 1 TTL Level - - - RS485 Protocol (D+), RS485 Protocol (D-), RS485 Protocol (Two Wires) - - 1 ModBus -
RS Stock No. 705-5833
Mfr. Part No.CP1E-N40DR-D
BrandOmron
TWD29,005.00
Each
units
CP1E Series CP1E - 24 Pulse - - 20.4 → 26.4 V dc Relay - - 16 (Relay) USB -
RS Stock No. 617-0199
Mfr. Part No.FX3U-32MT/ESS
BrandMitsubishi
TWD30,645.00
Each
units
- - - 16 Sink/Source - - - Transistor - - 16 - -
RS Stock No. 806-6809
Mfr. Part No.TM241C24U
TWD24,223.00
Each
units
- Modicon M241 - 14 - - - 24 V Transistor - - 10 - Yes
RS Stock No. 825-1688
Mfr. Part No.6ED1055-1HB00-0BA2
BrandSiemens
TWD2,746.00
Each
units
LOGO! 8, LOGO! 8.2 - - 4 Digital - - - Relay - - 4 - -
RS Stock No. 875-5672
Mfr. Part No.FX5U-32MR-ES
BrandMitsubishi
TWD29,520.00
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. 806-6803
Mfr. Part No.TM221CE40R
TWD15,982.00
Each
units
- Modicon M221 - 24 Discrete - - - Digital - Yes 16 - -
RS Stock No. 781-6868
Mfr. Part No.Q00UCPU
BrandMitsubishi
TWD17,074.00
Each
units
MELSEC Q Series Q Series - 1024 - - - - - - - 8192 Ethernet -
RS Stock No. 806-6828
Mfr. Part No.TM221CE24R
TWD11,547.00
Each
units
- Modicon M221 - - - - - - Digital - Yes - - Yes
RS Stock No. 806-6783
Mfr. Part No.TM241C40T
TWD27,483.00
Each
units
- Modicon M241 - 24 - - - 24 V Transistor - - 16 - Yes
RS Stock No. 133-260
Mfr. Part No.106394 | EC4P-221-MRXX1
BrandEaton
TWD15,643.00
Each
units
EasyControl - - 12 Analogue, Digital - - - Relay - - 6 CANOpen, EasyNet Yes
RS Stock No. 539-0724
Mfr. Part No.FX3U-80MR/ES
BrandMitsubishi
TWD48,677.00
Each
units
- - - 40 Sink/Source - - - Relay - - 40 - -
RS Stock No. 862-4455
Mfr. Part No.6ES7211-1BE40-0XB0
BrandSiemens
TWD6,676.00
Each
units
SIMATIC S7-1200 Series S7-1200 - 2 switch as Analogue Input), 6 (Digital Input Analogue, Digital - - 85 → 264 V ac Digital, Relay - - Relay Output), 4 (Digital Output Ethernet -