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. 468-4242
Mfr. Part No.SR3B261BD
HK$2,764.26
Each
units
- Zelio Logic - 16 Analogue, Discrete - - - Relay - - 10 - Yes
RS Stock No. 681-8715
Mfr. Part No.BMXP342000
HK$6,166.41
Each
units
Modicon M340 Modicon M340 - - Analogue, Digital - - 24 V dc Analogue, Digital - - - Ethernet -
RS Stock No. 479-6092
Mfr. Part No.SR2D201BD
HK$3,300.58
Each
units
- Zelio Logic - 12 Discrete - - - Relay - - 8 - -
RS Stock No. 468-4494
Mfr. Part No.SR2B201FU
HK$2,371.18
Each
units
- Zelio Logic - 12 Discrete - - - Relay - - 8 - Yes
RS Stock No. 806-6821
Mfr. Part No.TM221CE24T
HK$4,805.46
Each
units
- Modicon M221 - - - - - - Digital - Yes - - Yes
RS Stock No. 468-4438
Mfr. Part No.SR2B121BD
HK$1,611.51
Each
units
- Zelio Logic - 8 Analogue, Discrete - - - Relay - - 4 - Yes
RS Stock No. 806-6834
Mfr. Part No.TM221C24T
HK$4,504.10
Each
units
- Modicon M221 - - - - - - Digital - Yes - ModBus Yes
RS Stock No. 468-4450
Mfr. Part No.SR2B121FU
HK$1,572.33
Each
units
- Zelio Logic - 8 Discrete - - - Relay - - 4 - Yes
RS Stock No. 615-2337
Mfr. Part No.SR3XT43BD
HK$1,644.33
Each
units
Zelio Logic Modules Zelio Logic - 3 Analogue, PT100 - - - Analogue - - 2 - -
RS Stock No. 806-6840
Mfr. Part No.TM221C16R
HK$2,054.18
Each
units
- Modicon M221 - - - - - - Digital - - - - -
RS Stock No. 479-6064
Mfr. Part No.SR2B122BD
HK$1,496.26
Each
units
- Zelio Logic - 8 Analogue, Discrete - - - Transistor - - 4 - Yes
RS Stock No. 806-6837
Mfr. Part No.TM221CE16R
HK$3,086.04
Each
units
- Modicon M221 - 9 Discrete - - - Digital - Yes 7 - -
RS Stock No. 468-4472
Mfr. Part No.SR2B201BD
HK$2,295.09
Each
units
- Zelio Logic - 12 Analogue, Discrete - - - Relay - - 8 - Yes
RS Stock No. 479-6058
Mfr. Part No.SR2B121JD
HK$2,337.23
Each
units
- Zelio Logic - 8 Analogue, Discrete - - - Relay - - 4 - Yes
RS Stock No. 468-4371
Mfr. Part No.SR3PACK2BD
HK$3,385.89
Each
units
Zelio 2 Zelio Logic 2 - Up → 6 Analogue), 16 (Up → 16 Digital Analogue, Digital - - 24 V dc Relay - Yes 10 (Relay) - Yes
RS Stock No. 479-6165
HK$2,354.93
Each
units
- Zelio Logic - 6 Analogue, Discrete - - - Transistor - - 4 - Yes
RS Stock No. 479-6193
HK$4,121.17
Each
units
- Zelio Logic - 16 Discrete - - - Relay - - 10 - Yes
RS Stock No. 806-6815
Mfr. Part No.TM221C40R
HK$4,455.23
Each
units
- Modicon M221 - - - - - - Digital - Yes - - Yes
RS Stock No. 468-4488
Mfr. Part No.SR2A201FU
HK$3,943.54
Each
units
- Zelio Logic - 12 Discrete - - - Relay - - 8 - Yes
RS Stock No. 806-6828
Mfr. Part No.TM221CE24R
HK$4,018.08
Each
units
- Modicon M221 - - - - - - Digital - Yes - - Yes