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. 662-3520
Mfr. Part No.6ES7193-4CA20-0AA0
BrandSiemens
$17.70
Each
units
ET200S - - - - ET200S Series - - - - Terminal Module - - -
RS Stock No. 148-054
Mfr. Part No.BMXDDI6402K
$1,204.69
Each
units
M340 64 - Discrete - M340 Series 64 - 24 V dc - - - - -
RS Stock No. 901-0826
Mfr. Part No.2903805
$1,109.50
Each
units
TC MOBILE I/O X200 2 4 Analogue, Digital Relay PSI Modem SMS Relay 6 - 0 → 60 V dc 6 A Analogue, Digital 71.6mm 62.2mm 89.7mm
RS Stock No. 459-5394
Mfr. Part No.SRT2ID161
BrandOmron
$688.13
Each
units
SRT2 16 - Digital Mosfet, Relay, Transistor SRT2 Series 16 - 24 V dc 300 (Per Point) mA - 105mm 48mm 50mm
RS Stock No. 539-5000
Mfr. Part No.SR3MBU01BD
$253.85
Each
units
SR3 4 4 - Relay - - - 24 V dc - - 107.6mm 35.5mm 59.5mm
RS Stock No. 893-0647
Mfr. Part No.1315200000
BrandWeidmuller
$236.70
Each
units
- 16 - Digital Voltage - - 16 - 5 → 11 V - Digital Input 120mm 11.5mm 76mm
RS Stock No. 746-6722
Mfr. Part No.6ES7361-3CA01-0AA0
BrandSiemens
$486.45
Each
units
6ES7 Series - - - - S7-300 Series - - 24 V dc - - 125mm 80mm 120mm
RS Stock No. 510-1417
Mfr. Part No.CJ1W-AD081
BrandOmron
$1,352.75
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. 806-6922
Mfr. Part No.TM3DI8
$240.59
Each
units
TM3 Series 8 - - - Modicon M221, Modicon M241, Modicon M251 - - 24 V - - 90mm 23.6mm 70mm
RS Stock No. 512-5902
Mfr. Part No.CJ1W-OD212
BrandOmron
$587.29
Each
units
SYSMAC CJ Series - 16 - Digital, Transistor SYSMAC CJ Series 16 - 24 V dc 500 mA - 89mm 31mm 95.4mm
RS Stock No. 453-2624
Mfr. Part No.6ES7322-1BL00-0AA0
BrandSiemens
$1,626.70
Each
units
SIMATIC S7-300 Series - 32 - Digital S7-300 Series 32 - 20.4 → 28.8 V dc 500 mA - 125mm 40mm 120mm
RS Stock No. 453-2630
Mfr. Part No.6ES7322-1HH01-0AA0
BrandSiemens
$904.05
Each
units
SIMATIC S7-300 Series - 16 - Digital, Relay S7-300 Series - - 24 V dc, 24 → 240 V ac 2 A - 125mm 40mm 120mm
RS Stock No. 615-2387
Mfr. Part No.SR2COM01
$277.97
Each
units
Zelio Logic - - - - - - - 12 → 24 V dc - Relay 107.6mm 72mm 59.5mm
RS Stock No. 512-5930
Mfr. Part No.CJ1W-SCU41
BrandOmron
$1,174.73
Each
units
CJ Series - - - - CJ Series - - - - - - - -
RS Stock No. 434-1850
Mfr. Part No.6ES7231-7PD22-0XA0
BrandSiemens
$1,366.59
Each
units
S7-200 4 - Analogue - S7-231 Series - - 24 V dc - Input Module 80mm 71.2mm 62mm
RS Stock No. 806-7023
Mfr. Part No.TM3AI4
$323.95
Each
units
TM3 Series 4 - Current, Voltage - Modicon M221, Modicon M241, Modicon M251 - - -10 → 10 V dc - - 90mm 23.6mm 70mm
RS Stock No. 623-7680
Mfr. Part No.VBA-4E3A-KE-ZE/R
$249.00
Each
units
- 4 3 - - - 7 - 21 → 31 V dc - - 102mm 22.5mm 99mm
RS Stock No. 888-7997
Mfr. Part No.G4PB24
BrandOpto 22
$274.41
Each
units
G4 - - - - G4 I/O Modules 24 - - - - 190.5mm 158.8mm 58.9mm
RS Stock No. 893-6705
Mfr. Part No.1394390000
BrandWeidmuller
$270.49
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. 662-3586
Mfr. Part No.6ES7134-4GB11-0AB0
BrandSiemens
$435.65
Each
units
SIMATIC ET 200S 2 - Analogue - SIMATIC ET 200S Series 2 - 24 V dc - - 81mm 15mm 52mm
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