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 825-1681
製造零件編號6ED1055-1MB00-0BA2
BrandSiemens
HK$1,287.27
單位
LOGO! 8, LOGO! 8.2 LOGO! - 4 Digital - - - Relay - - 4 - -
RS庫存編號 862-4471
製造零件編號6ES7214-1AG40-0XB0
BrandSiemens
HK$4,215.96
單位
SIMATIC S7-1200 Series S7-1200 - 2 switch as Analogue Input), 14 (Digital Input Analogue, Digital - - 24 V dc Digital, Transistor - - Transistor Output), 10 (Digital Output Ethernet -
RS庫存編號 862-4477
製造零件編號6ES7214-1BG40-0XB0
BrandSiemens
HK$3,638.31
單位
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庫存編號 862-4487
製造零件編號6ES7215-1AG40-0XB0
BrandSiemens
HK$5,732.39
單位
SIMATIC S7-1200 Series S7-1200 - 2 switch as Analogue Input), 14 (Digital Input Analogue, Digital - - 24 V dc Digital, Transistor - - Transistor Output), 10 (Digital Output Ethernet -
RS庫存編號 499-756
製造零件編號6ED1052-2HB00-0BA6
BrandSiemens
HK$1,142.68
單位
LOGO Series - - 8 Digital - - - Relay - - 4 - -
RS庫存編號 872-6321
製造零件編號6AV2132-3GB00-0AA1
BrandSiemens
HK$9,653.44
單位
LOGO! 8, LOGO! 8.2 LOGO! - - Digital - - - Relay - - 4 Ethernet Yes
RS庫存編號 787-7989
製造零件編號6ES7312-5BF04-0AB0
BrandSiemens
HK$5,730.28
單位
SIMATIC S7-300 Series S7-300 - 10 (Digital) Digital - - 24 V dc Digital - - 6 (Digital) USB -
RS庫存編號 825-1685
製造零件編號6ED1055-1NB10-0BA2
BrandSiemens
HK$1,370.62
單位
LOGO! 8, LOGO! 8.2 LOGO! - 8 Digital - - - Relay - - 8 - -
RS庫存編號 872-6328
製造零件編號6AV2132-0KA00-0AA1
BrandSiemens
HK$5,330.49
單位
LOGO! 8, LOGO! 8.2 LOGO! - - Digital - - - Relay - - 4 Ethernet Yes
RS庫存編號 825-1691
製造零件編號6ED1055-1MM00-0BA2
BrandSiemens
HK$1,182.46
單位
LOGO! 8, LOGO! 8.2 LOGO! - - - - - - Analogue - - 2 - -
RS庫存編號 746-6520
製造零件編號6ES7313-5BG04-0AB0
BrandSiemens
HK$11,787.66
單位
- S7-300 - 4 Analogue), 28 (24 Digital Analogue, Digital - - 24 V dc Analogue, Digital - - 2 Analogue), 18 (16 Digital - -
RS庫存編號 787-7992
製造零件編號6ES7314-6BH04-0AB0
BrandSiemens
HK$19,141.32
單位
SIMATIC S7-300 Series S7-300 - 4 (Analogue), 24 (Digital) Analogue, Digital - - 24 V dc Analogue, Digital - - 2 (Analogue), 16 (Digital) USB -
RS庫存編號 746-6527
製造零件編號6ES7314-6EH04-0AB0
BrandSiemens
HK$23,514.74
單位
- S7-300 - 4 Analogue), 28 (24 Digital Analogue, Digital - - 24 V dc Analogue, Digital - - 2 Analogue), 18 (16 Digital Ethernet, Profinet -
RS庫存編號 862-4455
製造零件編號6ES7211-1BE40-0XB0
BrandSiemens
HK$1,976.61
單位
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 -
RS庫存編號 825-1697
製造零件編號6ED1055-1MD00-0BA2
BrandSiemens
HK$1,000.55
單位
LOGO! 8, LOGO! 8.2 LOGO! - 2 Analogue Pt100/1000 - - - - - - - - -
RS庫存編號 862-4480
製造零件編號6ES7214-1HG40-0XB0
BrandSiemens
HK$4,143.58
單位
SIMATIC S7-1200 Series S7-1200 - 2 switch as Analogue Input), 14 (Digital Input Analogue, Digital - - 24 V dc Digital, Relay - - Relay Output), 10 (Digital Output Ethernet -
RS庫存編號 862-4465
製造零件編號6ES7212-1AE40-0XB0
BrandSiemens
HK$2,405.33
單位
SIMATIC S7-1200 Series S7-1200 - 2 switch as Analogue Input), 8 (Digital Input Analogue, Digital - - 24 V dc Digital, Transistor - - Transistor Output), 6 (Digital Output Ethernet -
RS庫存編號 825-1688
製造零件編號6ED1055-1HB00-0BA2
BrandSiemens
HK$833.68
單位
LOGO! 8, LOGO! 8.2 LOGO! - 4 Digital - - - Relay - - 4 - -
RS庫存編號 203-3724
製造零件編號6ES7677-2DB42-0GL0
BrandSiemens
HK$38,462.05
單位
- - - - - - - - - - - - - -
RS庫存編號 862-4474
製造零件編號6ES7212-1HE40-0XB0
BrandSiemens
HK$2,514.74
單位
SIMATIC S7-1200 Series S7-1200 - 2 switch as Analogue Input), 8 (Digital Input Analogue, Digital - - 24 V dc Digital, Relay - - Relay Output), 6 (Digital Output Ethernet -