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庫存編號 623-7725
製造零件編號118533
HK$813.86
單位
- 4 - - - - 4 - 26.5 → 31.6 V - - 99.6mm 22.5mm 50.5mm
RS庫存編號 623-7747
製造零件編號115086
HK$1,151.26
單位
- 4 - - - - 4 - 21 → 31 V - - 118mm 18.7mm 60mm
RS庫存編號 623-7703
製造零件編號117993
HK$1,329.87
單位
- 4 2 - - - 6 - 20 → 30 V dc - - 99.6mm 22.5mm 44mm
RS庫存編號 623-7624
製造零件編號VBG-PB-K20-DMD
HK$10,569.73
單位
- - - - - - - - - - - 120mm 75mm 76mm
RS庫存編號 623-7753
製造零件編號VAA-4E2A-G1-ZE/P-S
HK$2,525.00
單位
- 4 2 - - - 6 - 26.5 → 31.6 V - - 102mm 45mm 60mm
RS庫存編號 623-7797
製造零件編號129381
HK$2,558.57
單位
- 2 - Analogue - - 2 - 24 V dc - - 99mm 22.5mm 85mm
RS庫存編號 623-7719
製造零件編號VBA-4E3A-G2-ZA/EA2
HK$1,639.88
單位
- 4 3 - - - 7 - 20 → 30 V dc - - 150mm 18.7mm 60mm
RS庫存編號 623-7680
製造零件編號VBA-4E3A-KE-ZE/R
HK$1,275.64
單位
- 4 3 - - - 7 - 21 → 31 V dc - - 102mm 22.5mm 99mm