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. 806-6897
Mfr. Part No.TMC2SL1
$114.34
Each
units
Modicon M221 2 - Analogue Current Modicon M221 - - 24 V dc 20 mA - - - -
RS Stock No. 888-7940
Mfr. Part No.G4ODC5
BrandOpto 22
$31.75
Each
units
G4 - - DC Digital Digital DC Voltage - - - 5 → 60 V dc 3 A Digital DC Output 48.8mm 12.2mm 41.1mm
RS Stock No. 893-6780
Mfr. Part No.1346610000
BrandWeidmuller
$13.44
Each
units
- - - - - Remote I/O Module - - - - - - - -
RS Stock No. 145-936
Mfr. Part No.CJ1W-DRM21
BrandOmron
$1,484.86
Each
units
- - - - - CJ Series 2048 (Fixed Allocation) - 11 → 25 V dc - - 31mm 90mm 78.7mm
RS Stock No. 787-7942
Mfr. Part No.6ES7221-1BF32-0XB0
BrandSiemens
$224.37
Each
units
SM 1221 8 - Digital Digital SIMATIC S7-1200 Series - - 24 V dc - - 100mm 45mm 75mm
RS Stock No. 855-1405
Mfr. Part No.2863931
$242.63
1 Box of 4
Box(es)
IB IL 24 DO 4-ME - 4 - Digital - - - - 2 A - 119.8mm 12.2mm 71.5mm
RS Stock No. 510-9196
Mfr. Part No.701550(3041/3046)/2 (Relais (Wechsler))
BrandJumo
$63.69
Each
units
- - 1 - Relay 703041 Series, 703042 Series, 703043 Series, 703044 Series - - - - Relay Output - - -
RS Stock No. 662-3583
Mfr. Part No.6ES7135-4FB01-0AB0
BrandSiemens
$291.87
Each
units
SIMATIC ET 200S - 2 - Analogue SIMATIC ET 200S Series 2 - 24 V dc 25 mA - 81mm 15mm 52mm
RS Stock No. 888-7846
Mfr. Part No.G4IDC5D
BrandOpto 22
$55.28
Each
units
G4 - - Digital DC Voltage Digital - - - 2.5 → 28 V dc 50 (Sinking) mA Digital DC Input 48.8mm 12.2mm 41.1mm
RS Stock No. 712-5080
Mfr. Part No.Insys Moros LAN Pro
$1,574.10
Each
units
- - - - - - - - 10 → 60 V dc - - 110mm 70mm 75mm
RS Stock No. 806-7067
Mfr. Part No.TM3TI4
$345.23
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. 674-1952
Mfr. Part No.TM2DDO32TK
$420.09
Each
units
Modicon M238, Twido Series - 32 - Digital Modicon M238, Twido Series - - 24 V dc 400 mA Output Module 92.3mm 33.5mm 94.5mm
RS Stock No. 539-0730
Mfr. Part No.FX3U-4AD-ADP
BrandMitsubishi
$501.98
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. 455-6945
Mfr. Part No.QY81P
BrandMitsubishi
$866.40
Each
units
MELSEC Q - 32 - Digital, Transistor MELSEC Q Series 32 - 12 → 24 V dc - - 98mm 27.4mm 90mm
RS Stock No. 735-2890
Mfr. Part No.6ES7231-5QA30-0XB0
BrandSiemens
$199.33
Each
units
SIMATIC S7-1200 1 - Analogue - SIMATIC S7-1200 Series 1 - 5 V dc - - 62mm 38mm 21mm
RS Stock No. 662-3606
Mfr. Part No.6ES7151-1CA00-3BL0
BrandSiemens
$1,171.64
Each
units
SIMATIC ET 200S 16 16 Digital Digital SIMATIC ET 200S Series 32 - 24 V dc 500 mA - 81mm 120mm 58mm
RS Stock No. 893-0625
Mfr. Part No.1334920000
BrandWeidmuller
$563.51
Each
units
U-remote - - - - Remote I/O - - - - Fieldbus Coupler 52mm 76mm 120mm
RS Stock No. 492-963
Mfr. Part No.FX2N-2DA
BrandMitsubishi
$718.02
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. 893-6718
Mfr. Part No.1506920000
BrandWeidmuller
$354.09
Each
units
- 4 - Analogue Voltage - - 4 - -10 → 10 V, 0 → 10 V, 0 → 5 V, 1 → 5 V, 2 → 10 V - Analogue Input 120mm 11.5mm 76mm
RS Stock No. 806-6938
Mfr. Part No.TM3DI16G
$255.85
Each
units
TM3 Series 16 - - - Modicon M221, Modicon M241, Modicon M251 - - 24 V - - 90mm 23.6mm 70mm
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