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.

Types of PLCs

Programmable logic controllers are divided into small, medium and large 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.


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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. 862-4465
Mfr. Part No.6ES7212-1AE40-0XB0
BrandSiemens
$482.71
Each
units
SIMATIC S7-1200 Series S7-1200 - 8 (Digital Input, 2 switch as Analogue Input) Analogue, Digital - - 24 V dc Digital, Transistor - - 6 (Digital Output, Transistor Output) Ethernet -
RS Stock No. 872-6328
Mfr. Part No.6AV2132-0KA00-0AA1
BrandSiemens
$1,000.95
Each
units
LOGO! 8, LOGO! 8.2 - - - Digital - - - Relay - - 4 Ethernet Yes
RS Stock No. 862-4459
Mfr. Part No.6ES7211-1AE40-0XB0
BrandSiemens
$363.46
Each
units
SIMATIC S7-1200 Series S7-1200 - 6 (Digital Input, 2 switch as Analogue Input) Analogue, Digital - - 24 V dc Digital, Transistor - - 4 (Digital Output, Transistor Output) Ethernet -
RS Stock No. 862-4468
Mfr. Part No.6ES7211-1HE40-0XB0
BrandSiemens
$383.40
Each
units
SIMATIC S7-1200 Series S7-1200 - 6 (Digital Input, 2 switch as Analogue Input) Analogue, Digital - - 24 V dc Digital, Relay - - 4 (Digital Output, Relay Output) Ethernet -
RS Stock No. 862-4471
Mfr. Part No.6ES7214-1AG40-0XB0
BrandSiemens
$844.24
Each
units
SIMATIC S7-1200 Series S7-1200 - 14 (Digital Input, 2 switch as Analogue Input) Analogue, Digital - - 24 V dc Digital, Transistor - - 10 (Digital Output, Transistor Output) Ethernet -
RS Stock No. 862-4455
Mfr. Part No.6ES7211-1BE40-0XB0
BrandSiemens
$392.29
Each
units
SIMATIC S7-1200 Series S7-1200 - 6 (Digital Input, 2 switch as Analogue Input) Analogue, Digital - - 85 → 264 V ac Digital, Relay - - 4 (Digital Output, Relay Output) Ethernet -
RS Stock No. 872-6321
Mfr. Part No.6AV2132-3GB00-0AA1
BrandSiemens
$1,679.64
Each
units
LOGO! 8, LOGO! 8.2 - - - Digital - - - Relay - - 4 Ethernet Yes
RS Stock No. 862-4487
Mfr. Part No.6ES7215-1AG40-0XB0
BrandSiemens
$1,142.69
Each
units
SIMATIC S7-1200 Series S7-1200 - 14 (Digital Input, 2 switch as Analogue Input) Analogue, Digital - - 24 V dc Digital, Transistor - - 10 (Digital Output, Transistor Output) Ethernet -
RS Stock No. 862-4461
Mfr. Part No.6ES7212-1BE40-0XB0
BrandSiemens
$481.21
Each
units
SIMATIC S7-1200 Series S7-1200 - 8 (Digital Input, 2 switch as Analogue Input) Analogue, Digital - - 85 → 264 V ac Digital, Relay - - 6 (Digital Output, Relay Output) Ethernet -
RS Stock No. 862-4474
Mfr. Part No.6ES7212-1HE40-0XB0
BrandSiemens
$492.10
Each
units
SIMATIC S7-1200 Series S7-1200 - 8 (Digital Input, 2 switch as Analogue Input) Analogue, Digital - - 24 V dc Digital, Relay - - 6 (Digital Output, Relay Output) Ethernet -
RS Stock No. 825-1663
Mfr. Part No.6ED1055-1CB00-0BA2
BrandSiemens
$163.64
Each
units
LOGO! 8, LOGO! 8.2 - - 4 Digital - - - Digital - - 4 Ethernet -
RS Stock No. 862-4496
Mfr. Part No.6ES7215-1HG40-0XB0
BrandSiemens
$1,201.26
Each
units
SIMATIC S7-1200 Series S7-1200 - 14 (Digital Input, 2 switch as Analogue Input) Analogue, Digital - - 24 V dc Digital, Relay - - 10 (Digital Output, Relay Output) Ethernet -
RS Stock No. 862-4480
Mfr. Part No.6ES7214-1HG40-0XB0
BrandSiemens
$741.10
Each
units
SIMATIC S7-1200 Series S7-1200 - 14 (Digital Input, 2 switch as Analogue Input) Analogue, Digital - - 24 V dc Digital, Relay - - 10 (Digital Output, Relay Output) Ethernet -
RS Stock No. 862-4499
Mfr. Part No.6ES7217-1AG40-0XB0
BrandSiemens
$1,692.64
Each
units
SIMATIC S7-1200 Series S7-1200 - 14 (Digital Input, 2 switch as Analogue Input) Analogue, Digital - - 24 V dc Digital, Transistor - - 10 (Digital Output, Transistor Output) Ethernet -
RS Stock No. 872-6319
Mfr. Part No.6AV2132-0HA00-0AA1
BrandSiemens
$796.20
Each
units
LOGO! 8, LOGO! 8.2 - - - Digital - - - Relay - - 4 Ethernet Yes
RS Stock No. 825-1694
Mfr. Part No.6ED1055-1MA00-0BA2
BrandSiemens
$231.75
Each
units
LOGO! 8, LOGO! 8.2 - - 2 Analogue - - - - - - - - -
RS Stock No. 862-4477
Mfr. Part No.6ES7214-1BG40-0XB0
BrandSiemens
$747.86
Each
units
SIMATIC S7-1200 Series S7-1200 - 14 (Digital Input, 2 switch as Analogue Input) Analogue, Digital - - 85 → 264 V ac Digital, Relay - - 10 (Digital Output, Relay Output) Ethernet -
RS Stock No. 825-1691
Mfr. Part No.6ED1055-1MM00-0BA2
BrandSiemens
$330.32
Each
units
LOGO! 8, LOGO! 8.2 - - - - - - - Analogue - - 2 - -
RS Stock No. 499-756
Mfr. Part No.6ED1052-2HB00-0BA6
BrandSiemens
$292.82
Each
units
LOGO Series - - 8 Digital - - - Relay - - 4 - -
RS Stock No. 468-7500
Mfr. Part No.6AG1057-1AA02-0AA0
BrandSiemens
$362.46
Each
units
LOGO Series - - - Analogue, Digital - - - Transistor - - - - -