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 Inputs Number of Digital Inputs Output Type Input Type Number of Analogue Inputs Voltage Category Number of Digital Outputs Interface Kit Included Number of Outputs Network Type Display Included
RS庫存編號 205-5854
製造零件編號1188165
HK$6,313.84
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PLCNext PLCnext - - - - - - - - - - Ethernet -
RS庫存編號 196-1258
製造零件編號2700974
HK$4,311.53
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Modbus/TCP ILC 8 8 Digital Digital - - - - - 4 ModBus -
RS庫存編號 196-1240
製造零件編號1051328
HK$65,174.20
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- - - - - - - - - - - - Ethernet Yes
RS庫存編號 205-5852
製造零件編號1069208
HK$21,999.72
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PLCNext AXC F 3 3 - - - - - - - - Ethernet -
全新
RS庫存編號 207-4850
製造零件編號2700989
HK$19,981.36
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Axioline F I/Os AXC 3050 - - - Digital - - - - - - Ethernet -
RS庫存編號 801-5707
製造零件編號2701483
HK$5,244.18
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Nanoline Family of Controllers NLC-START-04 6 - PNP Analogue - 24 V dc - - Yes 4 Ethernet Yes
RS庫存編號 205-5853
製造零件編號1151412
HK$5,651.49
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PLCNext AXC F 2 2 - - - - - - - - Ethernet -
RS庫存編號 177-1392
製造零件編號2404701
HK$5,221.17
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Axioline I/O PLCnext - - - - - - - - Yes - Ethernet -
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RS庫存編號 212-7353
製造零件編號2700988
HK$8,698.29
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Axioline I/Os AXC 1050 - - - Digital - - - - - - Ethernet -
RS庫存編號 177-1391
製造零件編號2404267
HK$7,292.13
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Axioline F I/O PLCnext - - - - - - - Ethernet Yes - Ethernet -