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. 705-4887
Mfr. Part No.FX3G-2AD-BD
BrandMitsubishi
$310.50
Each
units
MELSEC FX1N, MELSEC FX1S, MELSEC FX2N, MELSEC FX2NC, MELSEC FX3G, MELSEC FX3U, MELSEC FX3UC 2 - Analogue - MELSEC FX3G Series 2 - 0 → 10 V dc 4 → 20 mA - - - -
RS Stock No. 662-3592
Mfr. Part No.6ES7132-4BF00-0AA0
BrandSiemens
$175.84
Each
units
SIMATIC ET 200S - 8 - Digital SIMATIC ET 200S Series 8 - 24 V dc 500 mA - 81mm 15mm 52mm
RS Stock No. 147-641
Mfr. Part No.BMXDDO1602
$313.63
Each
units
M340 - 16 - Discrete, Transistor M340 Series 16 - 24 V dc - - - - -
RS Stock No. 253-2335
Mfr. Part No.TSXDMZ28DR
$2,029.45
Each
units
Modicon TSX Micro 16 12 Discrete Discrete Modicon TSX 28 - 100 → 120 V ac - - - - -
RS Stock No. 512-5895
Mfr. Part No.CJ1W-OC211
BrandOmron
$708.67
Each
units
SYSMAC CJ Series - 16 - Digital, Relay SYSMAC CJ Series 16 - 24 V dc, 250 V ac 2 A - 89mm 31mm 95.4mm
RS Stock No. 443-0146
Mfr. Part No.EASY819-DC-RC
BrandEaton
$920.76
Each
units
Easy 800 Series 12 6 Digital Relay Easy 800 Series, Easy 819 18 - 20.4 → 28.8 V dc - - 90mm 107.5mm 72mm
RS Stock No. 806-6935
Mfr. Part No.TM3DI16
$320.16
Each
units
TM3 Series 16 - - - Modicon M221, Modicon M241, Modicon M251 - - 24 V - - 90mm 23.6mm 70mm
RS Stock No. 868-7359
Mfr. Part No.750-461/003-000
BrandWago
$439.49
Each
units
750 2 1 Analogue Voltage - 3 - - - DC to DC 64mm 12mm 100mm
RS Stock No. 453-2551
Mfr. Part No.6ES7332-5HD01-0AB0
BrandSiemens
$1,507.85
Each
units
SIMATIC S7-300 Series - 4 - Analogue SIMATIC S7-300 Series 4 - 24 V dc - - 125mm 40mm 120mm
RS Stock No. 787-7970
Mfr. Part No.6ES7231-4HF32-0XB0
BrandSiemens
$748.00
Each
units
SM 1231 8 - Analogue Analogue SIMATIC S7-1200 Series - - 24 V dc - - 100mm 45mm 75mm
RS Stock No. 453-2517
Mfr. Part No.6ES7321-1BH02-0AA0
BrandSiemens
$419.95
Each
units
SIMATIC S7-300 Series 16 - Digital - SIMATIC S7-300 Series 16 - 20.4 → 28.8 V dc - - 125mm 40mm 120mm
RS Stock No. 828-5252
Mfr. Part No.6ES7231-4HD32-0XB0
BrandSiemens
$398.31
Each
units
6ES7231 4 - Analogue - SIMATIC S7-1200 4 - 24 V dc - - 100mm 45mm 75mm
RS Stock No. 746-6621
Mfr. Part No.6ES7331-7KB02-0AB0
BrandSiemens
$436.77
Each
units
- 2 - Analogue - SIMATIC S7-300 Series - - - - Input 125mm 40mm 120mm
RS Stock No. 888-7937
Mfr. Part No.G4ODC24
BrandOpto 22
$27.74
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. 612-9078
Mfr. Part No.6ES7331-7HF01-0AB0
BrandSiemens
$1,857.61
Each
units
SIMATIC S7-300 Series 8 - Analogue - SIMATIC S7-300 Series 8 - 24 V dc - - 125mm 40mm 120mm
RS Stock No. 810-4147
Mfr. Part No.6ES7231-5PD32-0XB0
BrandSiemens
$687.31
Each
units
SM 1231 4 - Analogue - CPU 1211, CPU 1212, CPU 1214 4 - 24 V dc - - 100mm 45mm 75mm
RS Stock No. 667-9236
Mfr. Part No.750-430
BrandWago
$136.34
Each
units
I/O SYSTEM 750 8 (Channel) - Digital - 750 Series - - 24 V dc - Input Module 100mm 12mm 64mm
RS Stock No. 787-7977
Mfr. Part No.6ES7232-4HD32-0XB0
BrandSiemens
$645.15
Each
units
SM 1232 - 4 Analogue Analogue SIMATIC S7-1200 Series - - 24 V dc 0 → 20 mA - 100mm 45mm 75mm
RS Stock No. 508-3943
Mfr. Part No.750461
BrandWago
$521.23
Each
units
I/O SYSTEM 750 2 (Channel) - Analogue - 750 Series - - - - Input Module 100mm 12mm 64mm
RS Stock No. 868-7361
Mfr. Part No.750-468
BrandWago
$443.05
Each
units
750 4 - Analogue Voltage - 6 - 35 V - DC to DC 64mm 12mm 100mm
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