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. 453-2624
Mfr. Part No.6ES7322-1BL00-0AA0
BrandSiemens
TWD21,808.00
Each
units
SIMATIC S7-300 Series - 32 - Digital S7-300 Series 32 - 20.4 → 28.8 V dc 500 mA - 125mm 40mm 120mm
RS Stock No. 855-3486
Mfr. Part No.2861768
TWD13,494.00
Each
units
IB IL IMPULSE-IN-PAC - - - - - - - - - - 135mm 12.2mm 71.5mm
RS Stock No. 539-0960
Mfr. Part No.FX3U-ENET
BrandMitsubishi
TWD19,938.00
Each
units
FX3U Series - - - - FX3U Series 8 - 24 V dc - Ethernet Communications Module 90mm 55mm 87mm
RS Stock No. 453-2551
Mfr. Part No.6ES7332-5HD01-0AB0
BrandSiemens
TWD25,136.00
Each
units
SIMATIC S7-300 Series - 4 - Analogue SIMATIC S7-300 Series 4 - 24 V dc - - 125mm 40mm 120mm
RS Stock No. 806-7051
Mfr. Part No.TM3AM6G
TWD14,668.00
Each
units
TM3 Series 4 2 Current, Voltage Current, Voltage Modicon M221, Modicon M241, Modicon M251 6 - -10 → 10 V dc 0 → 20 mA - 90mm 23.6mm 70mm
RS Stock No. 320-9115
Mfr. Part No.FX2N-16EYT-ESS/UL
BrandMitsubishi
TWD9,084.00
Each
units
FX2N Series 16 16 Analogue Transistor FX2N Series - - 24 V dc - Output Module 90mm 40mm 87mm
RS Stock No. 453-2618
Mfr. Part No.6ES7321-1BL00-0AA0
BrandSiemens
TWD15,739.00
Each
units
SIMATIC S7-300 Series 32 - Digital - S7-300 Series 32 - 20.4 → 28.8 V dc - - 125mm 40mm 120mm
RS Stock No. 787-7977
Mfr. Part No.6ES7232-4HD32-0XB0
BrandSiemens
TWD13,231.00
Each
units
SM 1232 - 4 Analogue Analogue SIMATIC S7-1200 Series - - 24 V dc 0 → 20 mA - 100mm 45mm 75mm
RS Stock No. 806-6935
Mfr. Part No.TM3DI16
TWD8,289.00
Each
units
TM3 Series 16 - - - Modicon M221, Modicon M241, Modicon M251 - - 24 V - - 90mm 23.6mm 70mm
RS Stock No. 806-6991
Mfr. Part No.TM3DQ8U
TWD6,194.00
Each
units
TM3 Series - 8 - Transistor Modicon M221, Modicon M241, Modicon M251 - - 24 V 500 mA - 90mm 23.6mm 70mm
RS Stock No. 492-963
Mfr. Part No.FX2N-2DA
BrandMitsubishi
TWD14,228.00
Each
units
FX1N Series, FX3G Series, FX3U Series - 2 - Analogue FX1N Series, FX3G Series, FX3U Series 2 - 5 V dc, 24 V dc 4 → 20 mA - 90mm 55mm 87mm
RS Stock No. 787-7986
Mfr. Part No.6ES7234-4HE32-0XB0
BrandSiemens
TWD11,430.00
Each
units
SM 1234 4 2 Analogue Analogue SIMATIC S7-1200 Series 6 - 24 V dc 0 → 20 mA - 100mm 45mm 75mm
RS Stock No. 705-4925
Mfr. Part No.FX3U-4AD
BrandMitsubishi
TWD11,737.00
Each
units
MELSEC FX 4 - Analogue - MELSEC FX Series 4 - 5 V dc, 24 V dc - - 90mm 55mm 87mm
RS Stock No. 539-0730
Mfr. Part No.FX3U-4AD-ADP
BrandMitsubishi
TWD10,905.00
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. 889-1615
Mfr. Part No.SNAP-PAC-R1
BrandOpto 22
TWD38,751.00
Each
units
SNAP PAC R - - - - SNAP PAC System - - - - Analogue, Digital 84.15mm 44.44mm 106.37mm
RS Stock No. 868-7359
Mfr. Part No.750-461/003-000
BrandWago
TWD9,129.00
Each
units
750 2 1 Analogue Voltage - 3 - - - DC to DC 64mm 12mm 100mm
RS Stock No. 662-3561
Mfr. Part No.6ES7138-4CA01-0AA0
BrandSiemens
TWD675.00
Each
units
ET200S - - - Current, Potential, Voltage ET200S Series - - 24 V dc - Power Module 81mm 15mm 52mm
RS Stock No. 806-7010
Mfr. Part No.TM3AI2H
TWD10,138.00
Each
units
TM3 Series 2 - Current, Voltage - Modicon M221, Modicon M241, Modicon M251 - - -10 → 10 V dc - - 90mm 23.6mm 70mm
RS Stock No. 787-7964
Mfr. Part No.6ES7223-1BH32-0XB0
BrandSiemens
TWD7,465.00
Each
units
SM 1223 8 8 Digital Digital SIMATIC S7-1200 Series 16 - 24 V dc 500 mA - 100mm 45mm 75mm
RS Stock No. 806-6922
Mfr. Part No.TM3DI8
TWD6,106.00
Each
units
TM3 Series 8 - - - Modicon M221, Modicon M241, Modicon M251 - - 24 V - - 90mm 23.6mm 70mm