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. 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. 662-3577
Mfr. Part No.6ES7131-4BF00-0AA0
BrandSiemens
TWD2,158.00
Each
units
SIMATIC ET 200S 8 - Digital - SIMATIC ET 200S Series 8 - 24 V dc - - 81mm 15mm 52mm
RS Stock No. 806-7026
Mfr. Part No.TM3AI4G
TWD7,060.00
Each
units
TM3 Series 4 - Current, Voltage - Modicon M221, Modicon M241, Modicon M251 - - -10 → 10 V dc - - 90mm 23.6mm 70mm
RS Stock No. 623-7680
Mfr. Part No.VBA-4E3A-KE-ZE/R
TWD6,151.00
Each
units
- 4 3 - - - 7 - 21 → 31 V dc - - 102mm 22.5mm 99mm
RS Stock No. 787-7945
Mfr. Part No.6ES7221-1BH32-0XB0
BrandSiemens
TWD6,191.00
Each
units
SM 1221 16 - Digital - SIMATIC S7-1200 Series - - 24 V dc - - 100mm 45mm 75mm
RS Stock No. 715-8935
Mfr. Part No.GHQ6310074R0111
BrandABB
TWD2,426.00
Each
units
- - - - - - - - 24 V dc - - - - -
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. 806-7017
Mfr. Part No.TM3DI8A
TWD3,463.00
Each
units
TM3 Series 8 - Digital - Modicon M221, Modicon M241, Modicon M251 - - 120 V - - 90mm 23.6mm 70mm
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. 806-7014
Mfr. Part No.TM3AI2HG
TWD5,891.00
Each
units
TM3 Series 2 - Current, Voltage - Modicon M221, Modicon M241, Modicon M251 - - -10 → 10 V dc - - 90mm 23.6mm 70mm
RS Stock No. 148-060
Mfr. Part No.BMXEHC0200
TWD16,054.00
Each
units
BMX 6 2 Encoder Configurable Modicon M340 6/2 - 24 V dc 2 A - 503.2mm 100mm 150mm
RS Stock No. 662-3621
Mfr. Part No.6ES7138-4CB11-0AB0
BrandSiemens
TWD1,754.00
Each
units
ET200S - - - Current, Potential, Voltage ET200S Series - - 24 → 230 V ac, 24 → 48 V dc - Power Module 81mm 15mm 52mm
RS Stock No. 806-7008
Mfr. Part No.TM3DQ32UK
TWD8,814.00
Each
units
TM3 Series - 32 - Source, Transistor Modicon M221, Modicon M241, Modicon M251 - - 24 V 100 mA - 90mm 30.2mm 70mm
RS Stock No. 875-5708
Mfr. Part No.FX5-8EYT/ESS
BrandMitsubishi
TWD5,464.00
Each
units
FX5 - 8 - Relay, Transistor FX5U CPU Module, FX5UC CPU Module - - - - Output 40mm 90mm 83mm
RS Stock No. 875-5711
Mfr. Part No.FX5-32ET/ESS
BrandMitsubishi
TWD13,963.00
Each
units
FX5 16 16 Sink, Source Relay, Transistor FX5U CPU Module, FX5UC CPU Module - - 100 → 240 V ac - I/O Module 150mm 90mm 83mm
RS Stock No. 615-0123
Mfr. Part No.88970270
BrandCrouzet
TWD6,038.00
Each
units
- - - - - - - - 24 V dc - - - - -
RS Stock No. 770-2497
Mfr. Part No.TM5SAO4H
TWD18,257.00
Each
units
TM5 - 4 - Analogue Modicon LMC058, Modicon M258 - - 24 V dc 0 → 20 mA - 99mm 12.5mm 75mm
RS Stock No. 875-5714
Mfr. Part No.FX5-16EYT/ESS
BrandMitsubishi
TWD9,084.00
Each
units
FX5 - 16 - Relay, Transistor FX5U CPU Module, FX5UC CPU Module - - - - Output 40mm 90mm 83mm
RS Stock No. 760-9162
Mfr. Part No.CP1W-20EDT
BrandOmron
TWD7,887.00
Each
units
CP1W 12 8 DC Transistor Omron Electronics SYSMAC CP1H/CP1L - - 24 V ac 130 mA - 86mm 90mm 50mm
RS Stock No. 889-0882
Mfr. Part No.SNAP-IDC-32-FM
BrandOpto 22
TWD17,261.00
Each
units
- - - - - - - - - - - 18.29mm - 82.55mm