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. 715-8917
Mfr. Part No.2CDG110025R0011
BrandABB
TWD22,291.00
Each
units
- - - - - - - - - - - - - -
RS Stock No. 806-7023
Mfr. Part No.TM3AI4
TWD11,731.00
Each
units
TM3 Series 4 - Current, Voltage - Modicon M221, Modicon M241, Modicon M251 - - -10 → 10 V dc - - 90mm 23.6mm 70mm
RS Stock No. 806-6998
Mfr. Part No.TM3DQ16U
TWD8,468.00
Each
units
TM3 Series - 16 - Transistor Modicon M221, Modicon M241, Modicon M251 - - 24 V 500 mA - 90mm 23.6mm 70mm
RS Stock No. 828-5252
Mfr. Part No.6ES7231-4HD32-0XB0
BrandSiemens
TWD7,847.00
Each
units
6ES7231 4 - Analogue - SIMATIC S7-1200 4 - 24 V dc - - 100mm 45mm 75mm
RS Stock No. 806-6954
Mfr. Part No.TM3DQ8T
TWD9,097.00
Each
units
TM3 Series - 8 - Source, Transistor Modicon M221, Modicon M241, Modicon M251 - - 24 V 500 mA - 90mm 23.6mm 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. 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. 875-5701
Mfr. Part No.FX5-16EX/ES
BrandMitsubishi
TWD7,622.00
Each
units
FX5 16 - Sink, Source - FX5U CPU Module, FX5UC CPU Module - - - - Input 40mm 90mm 83mm
RS Stock No. 510-1417
Mfr. Part No.CJ1W-AD081
BrandOmron
TWD29,523.00
Each
units
SYSMAC CJ Series, SYSMAC CP1H, SYSMAC CP1L 8 - Analogue - SYSMAC CJ Series, SYSMAC CP1H Series, SYSMAC CP1L Series 8 - -10 → 10 V, 0 → 10 V, 0 → 5 V, 1 → 5 V - - 90mm 31mm 65mm
RS Stock No. 806-7004
Mfr. Part No.TM3DQ16UK
TWD6,989.00
Each
units
TM3 Series - 16 - Transistor Modicon M221, Modicon M241, Modicon M251 - - 24 V 100 mA - 90mm 17.6mm 70mm
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. 806-7060
Mfr. Part No.TM3TI4G
TWD7,680.00
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. 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. 662-3494
Mfr. Part No.6ES7132-4BD02-0AA0
BrandSiemens
TWD1,680.00
Each
units
SIMATIC ET 200S - 4 - Digital SIMATIC ET 200S Series 4 - 24 V dc 500 mA - 81mm 15mm 52mm
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. 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. 806-6966
Mfr. Part No.TM3DQ16T
TWD8,468.00
Each
units
TM3 Series - 16 - Source, Transistor Modicon M221, Modicon M241, Modicon M251 - - 24 V 500 mA - 90mm 23.6mm 70mm
RS Stock No. 148-060
Mfr. Part No.BMXEHC0200
TWD16,128.00
Each
units
BMX 6 2 Encoder Configurable Modicon M340 6/2 - 24 V dc 2 A - 503.2mm 100mm 150mm
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. 806-7064
Mfr. Part No.TM3TI8T
TWD8,855.00
Each
units
TM3 Series 8 - Current, Voltage - Modicon M221, Modicon M241, Modicon M251 - - -10 → 10 V dc - - 90mm 23.6mm 70mm