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.


...
Read more Read less

Filters

Viewing 1 - 20 of 105 products
Results per page
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. 825-1681
Mfr. Part No.6ED1055-1MB00-0BA2
BrandSiemens
HK$1,287.27
Each
units
LOGO! 8, LOGO! 8.2 LOGO! - 4 Digital - - - Relay - - 4 - -
RS Stock No. 862-4471
Mfr. Part No.6ES7214-1AG40-0XB0
BrandSiemens
HK$4,215.96
Each
units
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 Stock No. 862-4477
Mfr. Part No.6ES7214-1BG40-0XB0
BrandSiemens
HK$3,638.31
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. 862-4487
Mfr. Part No.6ES7215-1AG40-0XB0
BrandSiemens
HK$5,732.39
Each
units
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 Stock No. 499-756
Mfr. Part No.6ED1052-2HB00-0BA6
BrandSiemens
HK$1,142.68
Each
units
LOGO Series - - 8 Digital - - - Relay - - 4 - -
RS Stock No. 746-6527
Mfr. Part No.6ES7314-6EH04-0AB0
BrandSiemens
HK$23,514.74
Each
units
- S7-300 - 4 Analogue), 28 (24 Digital Analogue, Digital - - 24 V dc Analogue, Digital - - 2 Analogue), 18 (16 Digital Ethernet, Profinet -
RS Stock No. 825-1685
Mfr. Part No.6ED1055-1NB10-0BA2
BrandSiemens
HK$1,370.62
Each
units
LOGO! 8, LOGO! 8.2 LOGO! - 8 Digital - - - Relay - - 8 - -
RS Stock No. 872-6328
Mfr. Part No.6AV2132-0KA00-0AA1
BrandSiemens
HK$5,321.02
Each
units
LOGO! 8, LOGO! 8.2 LOGO! - - Digital - - - Relay - - 4 Ethernet Yes
RS Stock No. 746-6520
Mfr. Part No.6ES7313-5BG04-0AB0
BrandSiemens
HK$11,787.66
Each
units
- S7-300 - 4 Analogue), 28 (24 Digital Analogue, Digital - - 24 V dc Analogue, Digital - - 2 Analogue), 18 (16 Digital - -
RS Stock No. 787-7992
Mfr. Part No.6ES7314-6BH04-0AB0
BrandSiemens
HK$19,141.32
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. 862-4455
Mfr. Part No.6ES7211-1BE40-0XB0
BrandSiemens
HK$1,976.61
Each
units
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 Stock No. 787-7989
Mfr. Part No.6ES7312-5BF04-0AB0
BrandSiemens
HK$5,730.28
Each
units
SIMATIC S7-300 Series S7-300 - 10 (Digital) Digital - - 24 V dc Digital - - 6 (Digital) USB -
RS Stock No. 825-1697
Mfr. Part No.6ED1055-1MD00-0BA2
BrandSiemens
HK$1,000.55
Each
units
LOGO! 8, LOGO! 8.2 LOGO! - 2 Analogue Pt100/1000 - - - - - - - - -
RS Stock No. 825-1691
Mfr. Part No.6ED1055-1MM00-0BA2
BrandSiemens
HK$1,182.46
Each
units
LOGO! 8, LOGO! 8.2 LOGO! - - - - - - Analogue - - 2 - -
RS Stock No. 862-4480
Mfr. Part No.6ES7214-1HG40-0XB0
BrandSiemens
HK$4,143.58
Each
units
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 Stock No. 825-1688
Mfr. Part No.6ED1055-1HB00-0BA2
BrandSiemens
HK$833.68
Each
units
LOGO! 8, LOGO! 8.2 LOGO! - 4 Digital - - - Relay - - 4 - -
RS Stock No. 872-6321
Mfr. Part No.6AV2132-3GB00-0AA1
BrandSiemens
HK$9,653.44
Each
units
LOGO! 8, LOGO! 8.2 LOGO! - - Digital - - - Relay - - 4 Ethernet Yes
RS Stock No. 862-4465
Mfr. Part No.6ES7212-1AE40-0XB0
BrandSiemens
HK$2,405.33
Each
units
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 Stock No. 825-1679
Mfr. Part No.6ED1055-1FB10-0BA2
BrandSiemens
HK$1,429.58
Each
units
LOGO! 8, LOGO! 8.2 LOGO! - 8 Digital - - - Relay - - 8 - -
RS Stock No. 165-3227
Mfr. Part No.6ED1052-2CC08-0BA0
BrandSiemens
HK$1,000.55
Each
units
LOGO! 8.2 - - 8 Analogue, Digital - - - Transistor - - 4 Ethernet -