PLC I/O Modules

PLC I/O modules are one of the three core components that operate a programmable logic controller. I/O refers to input/output. PLC I/O modules act as messengers between a processor and an I/O device.

How do PLC I/O modules work?

PLC I/O modules assist the data exchange between an external device and computer memory. Their main job is to process communication to the PLC and accept commands sent from a processor. They can also detect errors, run status reports and co-ordinate a timely flow of data.

Types of PLC I/O modules

The type of PLC I/O modules used by a programmable logic controller depends on the type of input device. These are categorised as input or output types. Some PLCs respond to digital inputs and outputs, whereas others respond to analog signals. Digital inputs are either on or off, and analog signals process conditions as voltage. Other types include discrete, speciality and communication modules. Smaller PLCs are usually designed with fixed I/O points.


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Description Price Manufacturer Series Number of Inputs Number of Outputs Input Type Output Type For Use With Number of I/O Interface Voltage Category Output Current Module Type Length Width Depth
RS Stock No. 714-0095
Mfr. Part No.1766-L32BWA
£666.00
Each
Units
1766 20 12 Digital Relay MicroLogix 1400 Series 32 Ethernet - - - 87mm 180mm 90mm
RS Stock No. 320-9109
Mfr. Part No.FX2N-16EX-ES/UL
BrandMitsubishi
£169.50
Each
Units
FX2N Series 16 - Digital - FX2N Series - - 24 V dc - Input Module 90mm 40mm 87mm
RS Stock No. 714-0108
Mfr. Part No.1766-L32BXB
£666.00
Each
Units
1766 20 12 Digital Relay MicroLogix 1400 Series 32 Ethernet - - - 87mm 180mm 90mm
RS Stock No. 612-9084
Mfr. Part No.6ES7334-0CE01-0AA0
BrandSiemens
£389.00
Each
Units
SIMATIC S7-300 Series 4 2 Analogue Analogue SIMATIC S7-300 Series 6 - 24 V dc - - 125mm 40mm 120mm
RS Stock No. 455-6822
Mfr. Part No.QX80
BrandMitsubishi
£145.00
Each
Units
MELSEC Q 16 - Digital - MELSEC Q Series 16 - 24 V dc - - 98mm 27.4mm 90mm
RS Stock No. 698-7357
Mfr. Part No.1746-OW16
£410.00
Each
Units
SLC 500 - 8 - Digital, Relay SLC 500 Series 16 - 5 → 125 V dc, 5 → 265 V ac 10 mA - - - -
RS Stock No. 612-9078
Mfr. Part No.6ES7331-7HF01-0AB0
BrandSiemens
£692.00
Each
Units
SIMATIC S7-300 Series 8 - Analogue - SIMATIC S7-300 Series 8 - 24 V dc - - 125mm 40mm 120mm
RS Stock No. 746-6621
Mfr. Part No.6ES7331-7KB02-0AB0
BrandSiemens
£199.00
Each
Units
- 2 - Analogue - SIMATIC S7-300 Series - - - - Input 125mm 40mm 120mm
RS Stock No. 662-3561
Mfr. Part No.6ES7138-4CA01-0AA0
BrandSiemens
£14.00
Each
Units
ET200S - - - Current, Potential, Voltage ET200S Series - - 24 V dc - Power Module 81mm 15mm 52mm
RS Stock No. 698-7596
Mfr. Part No.1762-L40BWA
£713.00
Each
Units
1762 Series 20 (Standard 24 V dc), 4 (Fast 24 V dc) 16 (Relay) Digital Relay MicroLogix 1200 Series 40 - - 1.5 (Break) A, 15 (Make) A - 87mm 160mm 90mm
RS Stock No. 455-6939
Mfr. Part No.QY10
BrandMitsubishi
£165.50
Each
Units
MELSEC Q - 16 - Digital, Relay MELSEC Q Series 16 - 24 V dc, 250 V ac - - 98mm 27.4mm 90mm
RS Stock No. 147-988
Mfr. Part No.BMXAMI0410
£283.00
Each
Units
M340 4 - Analogue - M340 Series 4 - 24 V dc - - - - -
RS Stock No. 539-0730
Mfr. Part No.FX3U-4AD-ADP
BrandMitsubishi
£242.50
Each
Units
FX3U Series 4 - Analogue - FX3U Series - - 5 V dc, 24 V dc - Analogue I/O Adapter 106mm 17.6mm 89.5mm
RS Stock No. 698-7679
Mfr. Part No.1762-IF4
£293.00
Each
Units
MicroLogix 1100, MicroLogix 1200, MicroLogix 1400 4 - Analogue Transistor MicroLogix 1100 Series, MicroLogix 1200 Series, MicroLogix 1400 Series 4 - -10 → 10 V dc ±21 mA - 87mm 40mm 90mm
RS Stock No. 320-9121
Mfr. Part No.FX2N-16EYR-ES/UL
BrandMitsubishi
£202.00
Each
Units
FX2N Series - 16 - Relay FX2N Series - - 24 V dc - Output Module 90mm 40mm 87mm
RS Stock No. 698-7344
Mfr. Part No.1746-OB16
£397.00
Each
Units
SLC 500 - 16 - Digital, Transistor SLC 500 Series 16 - 24 V dc 500 mA - - - -
RS Stock No. 698-7770
Mfr. Part No.1763-L16BBB
£533.00
Each
Units
1763 2 (Analogue), 4 (Fast 24 V dc), 6 (24 V dc) 2 (Fast FET), 2 (FET), 2 (Relay) Analogue Relay MicroLogix 1100 Series 18 Ethernet - - - 87mm 110mm 90mm
RS Stock No. 698-7350
Mfr. Part No.1746-NI4
£955.00
Each
Units
SLC 500 4 - Analogue - SLC 500 Series 4 - 24 V dc 85 mA - - - -
RS Stock No. 735-2904
Mfr. Part No.6ES7241-1CH30-1XB0
BrandSiemens
£78.00
Each
Units
S7-1200 - - - - S7-1200 Series - - - - - 62mm 38mm 21mm
RS Stock No. 698-7540
Mfr. Part No.1769-IQ16
£147.00
Each
Units
MicroLogix 1500 16 - Digital - MicroLogix 1500 Series 16 - 24 V dc - - - - -
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