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庫存編號 468-4242
製造零件編號SR3B261BD
HK$2,764.26
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- Zelio Logic - 16 Analogue, Discrete - - - Relay - - 10 - Yes
RS庫存編號 681-8715
製造零件編號BMXP342000
HK$5,326.84
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Modicon M340 Modicon M340 - - Analogue, Digital - - 24 V dc Analogue, Digital - - - Ethernet -
RS庫存編號 468-4494
製造零件編號SR2B201FU
HK$1,977.96
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- Zelio Logic - 12 Discrete - - - Relay - - 8 - Yes
RS庫存編號 806-6821
製造零件編號TM221CE24T
HK$4,576.63
單位
- Modicon M221 - - - - - - Digital - Yes - - Yes
RS庫存編號 479-6092
製造零件編號SR2D201BD
HK$3,143.41
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- Zelio Logic - 12 Discrete - - - Relay - - 8 - -
RS庫存編號 468-4438
製造零件編號SR2B121BD
HK$1,596.46
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- Zelio Logic - 8 Analogue, Discrete - - - Relay - - 4 - Yes
RS庫存編號 806-6834
製造零件編號TM221C24T
HK$4,289.62
單位
- Modicon M221 - - - - - - Digital - Yes - ModBus Yes
RS庫存編號 468-4472
製造零件編號SR2B201BD
HK$2,185.80
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- Zelio Logic - 12 Analogue, Discrete - - - Relay - - 8 - Yes
RS庫存編號 806-6837
製造零件編號TM221CE16R
HK$2,811.75
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- Modicon M221 - 9 Discrete - - - Digital - Yes 7 - -
RS庫存編號 468-4371
製造零件編號SR3PACK2BD
HK$3,385.89
單位
Zelio 2 Zelio Logic 2 - Up → 6 Analogue), 16 (Up → 16 Digital Analogue, Digital - - 24 V dc Relay - Yes 10 (Relay) - Yes
RS庫存編號 806-6840
製造零件編號TM221C16R
HK$1,700.65
單位
- Modicon M221 - - - - - - Digital - - - - -
RS庫存編號 479-6193
HK$3,924.92
單位
- Zelio Logic - 16 Discrete - - - Relay - - 10 - Yes
RS庫存編號 479-6165
HK$2,242.79
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- Zelio Logic - 6 Analogue, Discrete - - - Transistor - - 4 - Yes
RS庫存編號 479-6058
製造零件編號SR2B121JD
HK$2,225.93
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- Zelio Logic - 8 Analogue, Discrete - - - Relay - - 4 - Yes
RS庫存編號 479-6064
製造零件編號SR2B122BD
HK$1,251.71
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- Zelio Logic - 8 Analogue, Discrete - - - Transistor - - 4 - Yes
RS庫存編號 615-2337
製造零件編號SR3XT43BD
HK$1,395.47
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Zelio Logic Modules Zelio Logic - 3 Analogue, PT100 - - - Analogue - - 2 - -
RS庫存編號 468-4450
製造零件編號SR2B121FU
HK$1,497.46
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- Zelio Logic - 8 Discrete - - - Relay - - 4 - Yes
RS庫存編號 468-4523
製造零件編號SR2PACK2BD
HK$4,606.92
單位
Zelio 2 Zelio Logic 2 - Up → 6 Analogue), 12 (Up → 12 Digital Analogue, Digital - - 24 V dc Relay - Yes 8 (Relay) - Yes
RS庫存編號 806-6815
製造零件編號TM221C40R
HK$4,243.08
單位
- Modicon M221 - - - - - - Digital - Yes - - Yes
RS庫存編號 806-6828
製造零件編號TM221CE24R
HK$3,863.88
單位
- Modicon M221 - - - - - - Digital - Yes - - Yes