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. 148-105
Mfr. Part No.BMXDRA1605
$642.31
Each
units
M340 - 16 - Discrete, Relay M340 Series 16 - 24 V dc, 24 → 240 V ac - - - - -
RS Stock No. 148-206
Mfr. Part No.BMXDDI3202K
$900.45
Each
units
M340 32 - Discrete - M340 Series 32 - 24 V dc - - - - -
RS Stock No. 548-066
Mfr. Part No.BMXAMM0600
$1,653.01
Each
units
Modicon M340 Series 4 2 Analogue Analogue Modicon M340 6 - 24 V dc 0 → 20 mA Mixed Analogue I/O Module 307.6mm 100mm 140mm
RS Stock No. 662-3167
Mfr. Part No.6ES7131-4BD01-0AA0
BrandSiemens
$59.79
Each
units
SIMATIC ET 200S 4 - Digital - SIMATIC ET 200S Series 4 - 24 V dc - - 81mm 15mm 52mm
RS Stock No. 147-988
Mfr. Part No.BMXAMI0410
$937.01
Each
units
M340 4 - Analogue - M340 Series 4 - 24 V dc - - - - -
RS Stock No. 148-183
Mfr. Part No.BMXDDI1602
$458.85
Each
units
M340 16 - Discrete - M340 Series 16 - 24 V dc - - - - -
RS Stock No. 320-9109
Mfr. Part No.FX2N-16EX-ES/UL
BrandMitsubishi
$396.68
Each
units
FX2N Series 16 - Digital - FX2N Series - - 24 V dc - Input Module 90mm 40mm 87mm
RS Stock No. 615-2371
Mfr. Part No.SR2MOD02
$1,076.90
Each
units
- - - - - - - - 12 → 24 V dc - GSM modem 73mm 54.5mm 39.5mm
RS Stock No. 148-127
Mfr. Part No.BMXDDM16022
$650.34
Each
units
M340 8 8 Discrete Discrete, Transistor M340 Series 16 - 24 V dc - - - - -
RS Stock No. 662-3561
Mfr. Part No.6ES7138-4CA01-0AA0
BrandSiemens
$32.60
Each
units
ET200S - - - Current, Potential, Voltage ET200S Series - - 24 V dc - Power Module 81mm 15mm 52mm
RS Stock No. 806-6881
Mfr. Part No.TMC2TI2
$174.90
Each
units
Modicon M221 2 - Analogue Current Modicon M221 - - 24 V dc 20 mA - - - -
RS Stock No. 508-3959
Mfr. Part No.750600
BrandWago
$36.16
Each
units
I/O SYSTEM 750 - - - - 750 Series - - - - End Module 100mm 12mm 64mm
RS Stock No. 508-3921
Mfr. Part No.750455
BrandWago
$479.66
Each
units
I/O SYSTEM 750 4 (Channel) - Analogue - 750 Series - - - - Input Module 100mm 12mm 64mm
RS Stock No. 667-9242
Mfr. Part No.750-459
BrandWago
$407.57
Each
units
I/O SYSTEM 750 4 (Channel) - Analogue - 750 Series - - 0 → 10 V - Input Module 100mm 12mm 64mm
RS Stock No. 662-3577
Mfr. Part No.6ES7131-4BF00-0AA0
BrandSiemens
$104.33
Each
units
SIMATIC ET 200S 8 - Digital - SIMATIC ET 200S Series 8 - 24 V dc - - 81mm 15mm 52mm
RS Stock No. 662-3637
Mfr. Part No.6ES7134-4GD00-0AB0
BrandSiemens
$384.74
Each
units
SIMATIC ET 200S 4 - Analogue - SIMATIC ET 200S Series 4 - 24 V dc - - 81mm 15mm 52mm
RS Stock No. 821-1781
Mfr. Part No.CP1W-DAB21V
BrandOmron
$248.02
Each
units
CP1W - 2 - Analogue CP1L CPU Unit 2 - 0 → 10 V - - 86mm 90mm 50mm
RS Stock No. 674-1943
Mfr. Part No.TM2DDI16DT
$327.67
Each
units
Twido Series 16 - Digital - Twido Series - - 24 V dc - Input Module 90mm 24mm 70mm
RS Stock No. 662-3567
Mfr. Part No.6ES7134-4JB51-0AB0
BrandSiemens
$439.07
Each
units
SIMATIC ET 200S 2 - Analogue - SIMATIC ET 200S Series 2 - 24 V dc - - 81mm 15mm 52mm
RS Stock No. 453-2539
Mfr. Part No.6ES7322-1BH01-0AA0
BrandSiemens
$526.01
Each
units
SIMATIC S7-300 Series - 16 - Digital SIMATIC S7-300 Series 16 - 20.4 → 28.8 V dc 4 A - 125mm 40mm 120mm
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