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. 917-6389
BrandRS PRO
$94.30
Each
units
RS PRO Logic Modules - - 8 Digital - - - Digital, Relay - - 4 ModBus -
RS Stock No. 917-6370
BrandRS PRO
$213.97
Each
units
- - - 8 Analogue, Digital - - - Digital, Relay - - 4 ModBus Yes
RS Stock No. 917-6392
BrandRS PRO
$78.67
Each
units
RS PRO Logic Modules - - 1 TTL Level - - - RS485 Protocol (D-), RS485 Protocol (D+), RS485 Protocol (Two Wires) - - 1 ModBus -
RS Stock No. 917-6361
BrandRS PRO
$210.81
Each
units
- - - 8 Digital - - - Digital, Relay - - 4 ModBus Yes
RS Stock No. 917-6386
BrandRS PRO
$94.13
Each
units
RS PRO Logic Modules - - 8 Digital - - - Digital, Relay - - 4 ModBus -
RS Stock No. 917-6399
BrandRS PRO
$27.02
Each
units
RS PRO Logic Modules - - - - - - - - - - - - -
RS Stock No. 917-6373
BrandRS PRO
$162.18
Each
units
- - - 8 Digital - - - Digital, Relay - - 4 ModBus -
RS Stock No. 917-6383
BrandRS PRO
$71.94
Each
units
RS PRO Logic Modules - - 1 TTL Level - - - RS485 Protocol (D-), RS485 Protocol (D+), RS485 Protocol (Two Wires) - - 1 ModBus -
RS Stock No. 917-6377
BrandRS PRO
$167.79
Each
units
- - - 8 Analogue, Digital - - - Digital, Relay - - 4 ModBus -
RS Stock No. 864-4541
Mfr. Part No.0660-0600
BrandBARTH
$247.74
Each
units
STG-600 - - 10 Analogue, Digital - - - Mosfet, Solid State - - 8 - -
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. 479-6058
Mfr. Part No.SR2B121JD
$360.02
Each
units
- - - 8 Analogue, Discrete - - - Relay - - 4 - Yes
RS Stock No. 812-9770
Mfr. Part No.FT1A-B12RA
BrandIdec
$781.94
Each
units
- FT1A - 8 Sink - - 24 V dc Relay - - 4 - -
RS Stock No. 885-0926
Mfr. Part No.IS.MD21.base
$452.16
Each
units
- M-Duino - 13 Analogue, Digital - - 12 → 24 V dc Analogue, Digital - - 8 Ethernet, ModBus -
RS Stock No. 479-6064
Mfr. Part No.SR2B122BD
$305.55
Each
units
- - - 8 Analogue, Discrete - - - Transistor - - 4 - Yes
RS Stock No. 468-4472
Mfr. Part No.SR2B201BD
$536.04
Each
units
- - - 12 Analogue, Discrete - - - Relay - - 8 - Yes
RS Stock No. 875-5688
Mfr. Part No.FX5U-32MT-ESS
BrandMitsubishi
$1,364.56
Each
units
MELSEC IQ-F Series IQ Platform-Compatible PLC FX5U - 16 Sink, Source - - 100 → 240 V ac Relay, Transistor - - 16 Inverter Communication, MELSEC Communication protocol (3C/4C Frames), MELSOFT Connection, Modbus RTUI, N:N Network, Predefined Protocol Support, SLMP (3E Frame), Socket Communication -
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. 468-4242
Mfr. Part No.SR3B261BD
$718.85
Each
units
- - - 16 Analogue, Discrete - - - Relay - - 10 - Yes