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. 453-2539
Mfr. Part No.6ES7322-1BH01-0AA0
BrandSiemens
$617.79
Each
units
SIMATIC S7-300 Series - 16 - Digital SIMATIC S7-300 Series 16 - 20.4 → 28.8 V dc 4 A - 125mm 40mm 120mm
RS Stock No. 787-7945
Mfr. Part No.6ES7221-1BH32-0XB0
BrandSiemens
$380.08
Each
units
SM 1221 16 - Digital - SIMATIC S7-1200 Series - - 24 V dc - - 100mm 45mm 75mm
RS Stock No. 453-2618
Mfr. Part No.6ES7321-1BL00-0AA0
BrandSiemens
$1,068.49
Each
units
SIMATIC S7-300 Series 32 - Digital - S7-300 Series 32 - 20.4 → 28.8 V dc - - 125mm 40mm 120mm
RS Stock No. 662-3567
Mfr. Part No.6ES7134-4JB51-0AB0
BrandSiemens
$418.14
Each
units
SIMATIC ET 200S 2 - Analogue - SIMATIC ET 200S Series 2 - 24 V dc - - 81mm 15mm 52mm
RS Stock No. 662-3678
Mfr. Part No.6ES7151-3AA23-0AB0
BrandSiemens
$724.61
Each
units
ET200S - - - - ET200S Series - - 24 V dc - Interface Module 119.5mm 60mm 75mm
RS Stock No. 667-9251
Mfr. Part No.750-530
BrandWago
$167.66
Each
units
I/O SYSTEM 750 - 8 (Channel) - Digital 750 Series - - 24 V dc - Output Module 100mm 12mm 64mm
RS Stock No. 662-3595
Mfr. Part No.6ES7134-4GB01-0AB0
BrandSiemens
$355.82
Each
units
SIMATIC ET 200S 2 - Analogue - SIMATIC ET 200S Series 2 - 24 V dc - - 81mm 15mm 52mm
RS Stock No. 787-7973
Mfr. Part No.6ES7232-4HB32-0XB0
BrandSiemens
$521.21
Each
units
SM 1232 - 2 - Analogue SIMATIC S7-1200 Series - - 24 V dc 0 → 20 mA - 100mm 45mm 75mm
RS Stock No. 735-2904
Mfr. Part No.6ES7241-1CH30-1XB0
BrandSiemens
$195.49
Each
units
S7-1200 - - - - S7-1200 Series - - - - - 62mm 38mm 21mm
RS Stock No. 674-1918
Mfr. Part No.TM2ALM3LT
$556.97
Each
units
Modicon M238, Twido Series 1 1 Analogue Analogue Modicon M238, Twido Series - - 24 V dc - I/O Module 95.6mm 27.3mm 94.5mm
RS Stock No. 888-8586
Mfr. Part No.SNAP-AIRTD
BrandOpto 22
$514.17
Each
units
SNAP 2 - Analogue RTD - SNAP PAC System 2 - - - Analogue Input 82.55mm 18.29mm 90.17mm
RS Stock No. 806-6887
Mfr. Part No.TMC2AI2
$197.18
Each
units
Modicon M221 2 - Analogue Current Modicon M221 - - 24 V dc 20 mA - - - -
RS Stock No. 662-3599
Mfr. Part No.6ES7135-4GB01-0AB0
BrandSiemens
$291.87
Each
units
SIMATIC ET 200S - 2 - Analogue SIMATIC ET 200S Series 2 - 24 V dc 4 → 20 mA - 81mm 15mm 52mm
RS Stock No. 888-7849
Mfr. Part No.G4IDC5
BrandOpto 22
$26.60
Each
units
G4 - - Digital DC Voltage Digital - - - 10 → 32 V dc, 12 → 32 V ac 50 (Sinking) mA Digital DC Input 48.8mm 12.2mm 41.1mm
RS Stock No. 662-3491
Mfr. Part No.6ES7132-4BD32-0AA0
BrandSiemens
$149.12
Each
units
SIMATIC ET 200S - 4 - Digital SIMATIC ET 200S Series 4 - 24 V dc 2 A - 81mm 15mm 52mm
RS Stock No. 148-004
Mfr. Part No.BMXAMO0210
$561.13
Each
units
M340 - 2 - Analogue M340 Series 2 - 24 V dc - - - - -
RS Stock No. 662-3589
Mfr. Part No.6ES7134-4FB01-0AB0
BrandSiemens
$293.94
Each
units
SIMATIC ET 200S 2 - Analogue - SIMATIC ET 200S Series 2 - 24 V dc - - 81mm 15mm 52mm
RS Stock No. 147-887
Mfr. Part No.BMXDDM16025
$389.31
Each
units
M340 8 8 Discrete Discrete, Relay M340 Series 16 - 24 V dc - - - - -
RS Stock No. 453-2646
Mfr. Part No.6ES7322-5HF00-0AB0
BrandSiemens
$494.34
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. 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 - - - -
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