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. 825-1697
Mfr. Part No.6ED1055-1MD00-0BA2
BrandSiemens
TWD4,316.00
Each
units
LOGO! 8, LOGO! 8.2 LOGO! - 2 Analogue Pt100/1000 - - - - - - - - -
RS Stock No. 821-1775
Mfr. Part No.CP1L-EM40DR-D
BrandOmron
TWD33,029.00
Each
units
CP Series CP1L-EM - 24 DC - - 20.4 → 26.4 V dc Relay - - 16 Ethernet Yes
RS Stock No. 806-6752
Mfr. Part No.TM241CEC24R
TWD29,174.00
Each
units
- Modicon M241 - 14 - - - 100 → 240 V Relay - - 10 Ethernet, ModBus, Profibus DP, USB Yes
RS Stock No. 862-4468
Mfr. Part No.6ES7211-1HE40-0XB0
BrandSiemens
TWD7,080.00
Each
units
SIMATIC S7-1200 Series S7-1200 - 2 switch as Analogue Input), 6 (Digital Input Analogue, Digital - - 24 V dc Digital, Relay - - Relay Output), 4 (Digital Output Ethernet -
RS Stock No. 806-6768
Mfr. Part No.TM241CE40R
TWD32,311.00
Each
units
- Modicon M241 - 24 - - - 100 → 240 V Relay - - 16 - Yes
RS Stock No. 806-6786
Mfr. Part No.TM241C40U
TWD17,917.00
Each
units
- Modicon M241 - 24 - - - 24 V Transistor - - 16 Ethernet, ModBus, Profibus DP, USB Yes
RS Stock No. 815-5530
Mfr. Part No.AFP0RC10RS
BrandPanasonic
TWD6,955.00
Each
units
FP0R Series AFPOR Series - 6 Sink, Source - - 24 V dc Relay - - 4 Ethernet Yes
RS Stock No. 806-6834
Mfr. Part No.TM221C24T
TWD17,002.00
Each
units
- Modicon M221 - - - - - - Digital - Yes - ModBus Yes
RS Stock No. 667-9208
Mfr. Part No.750-842
BrandWago
TWD14,010.00
Each
units
- - - - - - - - - - - - - -
RS Stock No. 806-6792
Mfr. Part No.TM241CE24U
TWD26,632.00
Each
units
- Modicon M241 - 14 - - - 24 V Transistor - - 10 Ethernet, ModBus, Profibus DP, USB Yes
RS Stock No. 443-3864
Mfr. Part No.ALVLS V2.32
BrandMitsubishi
TWD5,255.00
Each
units
- Alpha 2 - - - - - - - - - - - -
RS Stock No. 862-4477
Mfr. Part No.6ES7214-1BG40-0XB0
BrandSiemens
TWD14,390.00
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. 806-6783
Mfr. Part No.TM241C40T
TWD28,857.00
Each
units
- Modicon M241 - 24 - - - 24 V Transistor - - 16 - Yes
RS Stock No. 885-0923
Mfr. Part No.IS.MD58.base
TWD14,481.00
Each
units
- M-Duino - 36 Analogue, Digital - - 12 → 24 V dc Analogue, Digital - - 22 Ethernet, ModBus -
RS Stock No. 787-7992
Mfr. Part No.6ES7314-6BH04-0AB0
BrandSiemens
TWD70,070.00
Each
units
SIMATIC S7-300 Series S7-300 - 4 (Analogue), 24 (Digital) Analogue, Digital - - 24 V dc Analogue, Digital - - 2 (Analogue), 16 (Digital) USB -
RS Stock No. 705-5818
Mfr. Part No.CP1E-N30DR-A
BrandOmron
TWD28,096.00
Each
units
CP1E Series CP1E - 18 Pulse - - 85 → 264 V ac Relay - - 12 (Relay) USB -
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. 917-6383
BrandRS PRO
TWD1,403.00
Each
units
RS PRO Logic Modules - - 1 TTL Level - - - RS485 Protocol (D+), RS485 Protocol (D-), RS485 Protocol (Two Wires) - - 1 ModBus -
RS Stock No. 539-0724
Mfr. Part No.FX3U-80MR/ES
BrandMitsubishi
TWD48,487.00
Each
units
- FX3U - 40 Sink/Source - - - Relay - - 40 - -
RS Stock No. 806-6853
Mfr. Part No.TM221ME16RG
TWD17,570.00
Each
units
- Modicon M221 - - - - - - Digital - Yes - - Yes