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. 806-6932
Mfr. Part No.TM3DI16K
TWD4,407.00
Each
units
TM3 Series 16 - - - Modicon M221, Modicon M241, Modicon M251 - - 24 V - - 90mm 17.6mm 70mm
RS Stock No. 888-7357
Mfr. Part No.240D10
BrandOpto 22
TWD1,088.00
Each
units
Power - - - DC Output - - - 24 → 280 V ac - Solid State Relay 44.5mm 57.2mm 24.5mm
RS Stock No. 806-6948
Mfr. Part No.TM3DQ8RG
TWD4,137.00
Each
units
TM3 Series - 8 - Relay Modicon M221, Modicon M241, Modicon M251 - - 24 → 240 V 2 A - 90mm 23.6mm 70mm
RS Stock No. 806-6966
Mfr. Part No.TM3DQ16T
TWD5,666.00
Each
units
TM3 Series - 16 - Source, Transistor Modicon M221, Modicon M241, Modicon M251 - - 24 V 500 mA - 90mm 23.6mm 70mm
RS Stock No. 806-7023
Mfr. Part No.TM3AI4
TWD6,970.00
Each
units
TM3 Series 4 - Current, Voltage - Modicon M221, Modicon M241, Modicon M251 - - -10 → 10 V dc - - 90mm 23.6mm 70mm
RS Stock No. 746-6589
Mfr. Part No.6ES7322-1FH00-0AA0
BrandSiemens
TWD16,638.00
Each
units
- - 16 - Digital S7-300 Series - - 120/230 V ac - Output 125mm 40mm 120mm
RS Stock No. 806-7073
Mfr. Part No.TM3TI8TG
TWD8,454.00
Each
units
TM3 Series 8 - Current, Voltage - Modicon M221, Modicon M241, Modicon M251 - - -10 → 10 V dc - - 90mm 23.6mm 70mm
RS Stock No. 806-6944
Mfr. Part No.TM3DQ8R
TWD4,137.00
Each
units
TM3 Series - 8 - Relay Modicon M221, Modicon M241, Modicon M251 - - 24 → 240 V 2 A - 90mm 23.6mm 70mm
RS Stock No. 667-9245
Mfr. Part No.750-469/003-000
BrandWago
TWD9,502.00
Each
units
I/O SYSTEM 750 2 (Channel) - Analogue - 750 Series - - - - Input Module 100mm 12mm 64mm
RS Stock No. 806-7060
Mfr. Part No.TM3TI4G
TWD7,645.00
Each
units
TM3 Series 4 - Current, Temperature, Voltage - Modicon M221, Modicon M241, Modicon M251 - - -10 → 10 V dc - - 90mm 23.6mm 70mm
RS Stock No. 806-7039
Mfr. Part No.TM3AI8G
TWD8,814.00
Each
units
TM3 Series 8 - Current, Voltage - Modicon M221, Modicon M241, Modicon M251 - - -10 → 10 V dc - - 90mm 23.6mm 70mm
RS Stock No. 806-6938
Mfr. Part No.TM3DI16G
TWD5,306.00
Each
units
TM3 Series 16 - - - Modicon M221, Modicon M241, Modicon M251 - - 24 V - - 90mm 23.6mm 70mm
RS Stock No. 806-7036
Mfr. Part No.TM3AQ2G
TWD5,891.00
Each
units
TM3 Series - 2 - Current, Voltage Modicon M221, Modicon M241, Modicon M251 - - -10 → 10 V dc 0 → 20 mA - 90mm 23.6mm 70mm
RS Stock No. 434-1850
Mfr. Part No.6ES7231-7PD22-0XA0
BrandSiemens
TWD29,687.00
Each
units
S7-200 4 - Analogue - S7-231 Series - - 24 V dc - Input Module 80mm 71.2mm 62mm
RS Stock No. 875-5705
Mfr. Part No.FX5-16EYR/ES
BrandMitsubishi
TWD9,084.00
Each
units
FX5 - 16 - Relay, Transistor FX5U CPU Module, FX5UC CPU Module - - - - Output 40mm 90mm 83mm
RS Stock No. 806-6957
Mfr. Part No.TM3DQ16R
TWD5,801.00
Each
units
TM3 Series - 16 - Relay Modicon M221, Modicon M241, Modicon M251 - - 24 → 240 V 2 A - 90mm 23.6mm 70mm
RS Stock No. 662-3678
Mfr. Part No.6ES7151-3AA23-0AB0
BrandSiemens
TWD12,456.00
Each
units
ET200S - - - - ET200S Series - - 24 V dc - Interface Module 119.5mm 60mm 75mm
RS Stock No. 715-8917
Mfr. Part No.2CDG110025R0011
BrandABB
TWD22,291.00
Each
units
- - - - - - - - - - - - - -
RS Stock No. 705-4928
Mfr. Part No.FX3U-4DA
BrandMitsubishi
TWD19,088.00
Each
units
MELSEC FX - 4 - Analogue MELSEC FX Series 4 - 5 V dc, 24 V dc 0 → 20 mA - 90mm 55mm 87mm
RS Stock No. 806-6998
Mfr. Part No.TM3DQ16U
TWD5,891.00
Each
units
TM3 Series - 16 - Transistor Modicon M221, Modicon M241, Modicon M251 - - 24 V 500 mA - 90mm 23.6mm 70mm