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. 810-4141
Mfr. Part No.6ES7231-5PF32-0XB0
BrandSiemens
TWD17,754.00
Each
units
SM 1231 8 - Analogue - CPU 1211, CPU 1212, CPU 1214 8 - 24 V dc - - 100mm 70mm 75mm
RS Stock No. 806-7042
Mfr. Part No.TM3AM6
TWD14,205.00
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. 806-6979
Mfr. Part No.TM3DQ16TK
TWD6,989.00
Each
units
TM3 Series - 16 - Source, Transistor Modicon M221, Modicon M241, Modicon M251 - - 24 V 100 mA - 90mm 17.6mm 70mm
RS Stock No. 508-3937
Mfr. Part No.750554
BrandWago
TWD12,726.00
Each
units
I/O SYSTEM 750 - 2 (Channel) - Analogue 750 Series - - - - Output Module 100mm 12mm 64mm
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. 746-6602
Mfr. Part No.6ES7323-1BH01-0AA0
BrandSiemens
TWD11,961.00
Each
units
- 8 8 Digital Digital S7-300 Series - - 24 V dc - - 125mm 40mm 120mm
RS Stock No. 453-2646
Mfr. Part No.6ES7322-5HF00-0AB0
BrandSiemens
TWD10,738.00
Each
units
SIMATIC S7-300 Series - 8 - Digital, Relay S7-300 Series 8 - 24 V dc, 24 → 240 V ac 5 A - 125mm 40mm 120mm
RS Stock No. 320-9143
Mfr. Part No.FX2N-48ER-ES/UL
BrandMitsubishi
TWD20,010.00
Each
units
FX2N Series 24 24 - - FX2N Series - - 100 → 240 V ac - I/O Module 90mm 150mm 87mm
RS Stock No. 662-3498
Mfr. Part No.6ES7131-4BD01-0AB0
BrandSiemens
TWD1,700.00
Each
units
SIMATIC ET 200S 4 - Digital - SIMATIC ET 200S Series 4 - 24 V dc 500 mA - 81mm 15mm 52mm
RS Stock No. 888-7903
Mfr. Part No.G4OAC5A
BrandOpto 22
TWD702.00
Each
units
G4 1 1 Digital Digital AC Voltage - - - 24 → 280 V ac 3 A Digital AC Output 48.8mm 12.2mm 41.1mm
RS Stock No. 806-7008
Mfr. Part No.TM3DQ32UK
TWD8,855.00
Each
units
TM3 Series - 32 - Source, Transistor Modicon M221, Modicon M241, Modicon M251 - - 24 V 100 mA - 90mm 30.2mm 70mm
RS Stock No. 806-6941
Mfr. Part No.TM3DI32K
TWD7,585.00
Each
units
TM3 Series 32 - - - Modicon M221, Modicon M241, Modicon M251 - - 24 V - - 90mm 30.2mm 70mm
RS Stock No. 806-7054
Mfr. Part No.TM3TM3
TWD8,855.00
Each
units
TM3 Series 2 1 Current, Temperature, Voltage Current, Voltage Modicon M221, Modicon M241, Modicon M251 3 - -10 → 10 V dc 0 → 20 mA - 90mm 23.6mm 70mm
RS Stock No. 736-1444
Mfr. Part No.LAN module
BrandGrasslin
TWD12,941.00
Each
units
- - - - - Talento 892 - - - - Lan Module - - -
RS Stock No. 806-6926
Mfr. Part No.TM3DI8G
TWD3,524.00
Each
units
TM3 Series 8 - - - Modicon M221, Modicon M241, Modicon M251 - - 24 V - - 90mm 23.6mm 70mm
RS Stock No. 806-6944
Mfr. Part No.TM3DQ8R
TWD6,643.00
Each
units
TM3 Series - 8 - Relay Modicon M221, Modicon M241, Modicon M251 - - 24 → 240 V 2 A - 90mm 23.6mm 70mm
RS Stock No. 320-9121
Mfr. Part No.FX2N-16EYR-ES/UL
BrandMitsubishi
TWD9,084.00
Each
units
FX2N Series - 16 - Relay FX2N Series - - 24 V dc - Output Module 90mm 40mm 87mm
RS Stock No. 667-9245
Mfr. Part No.750-469/003-000
BrandWago
TWD9,225.00
Each
units
I/O SYSTEM 750 2 (Channel) - Analogue - 750 Series - - - - Input Module 100mm 12mm 64mm
RS Stock No. 806-7058
Mfr. Part No.TM3TM3G
TWD8,855.00
Each
units
TM3 Series 2 1 Current, Temperature, Voltage Current, Voltage Modicon M221, Modicon M241, Modicon M251 3 - -10 → 10 V dc 0 → 20 mA - 90mm 23.6mm 70mm
RS Stock No. 806-7014
Mfr. Part No.TM3AI2HG
TWD10,513.00
Each
units
TM3 Series 2 - Current, Voltage - Modicon M221, Modicon M241, Modicon M251 - - -10 → 10 V dc - - 90mm 23.6mm 70mm