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. 623-7680
Mfr. Part No.VBA-4E3A-KE-ZE/R
MYR730.01
Each
units
- 4 3 - - - 7 - 21 → 31 V dc - - 102mm 22.5mm 99mm
RS Stock No. 623-7624
Mfr. Part No.VBG-PB-K20-DMD
MYR4,678.07
Each
units
- - - - - - - - - - - 120mm 75mm 76mm
RS Stock No. 623-7719
Mfr. Part No.VBA-4E3A-G2-ZA/EA2
MYR966.94
Each
units
- 4 3 - - - 7 - 20 30 V dc - - 150mm 18.7mm 60mm
RS Stock No. 623-7747
Mfr. Part No.115086
MYR678.78
Each
units
- 4 - - - - 4 - 21 → 31 V - - 118mm 18.7mm 60mm
RS Stock No. 623-7703
Mfr. Part No.117993
MYR640.36
Each
units
- 4 2 - - - 6 - 20 30 V dc - - 99.6mm 22.5mm 44mm
RS Stock No. 623-7753
Mfr. Part No.VAA-4E2A-G1-ZE/P-S
MYR1,509.64
Each
units
- 4 2 - - - 6 - 26.5 → 31.6 V - - 102mm 45mm 60mm
RS Stock No. 623-7797
Mfr. Part No.129381
MYR1,835.58
Each
units
- 2 - Analogue - - 2 - 24 V dc - - 99mm 22.5mm 85mm
RS Stock No. 623-7725
Mfr. Part No.118533
MYR441.85
Each
units
- 4 - - - - 4 - 26.5 → 31.6 V - - 99.6mm 22.5mm 50.5mm