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. 888-7937
Mfr. Part No.G4ODC24
BrandOpto 22
£13.11
Each
Units
G4 - - DC Digital Digital DC Voltage - - - 5 → 60 V dc 3 A Digital DC Output 48.8mm 12.2mm 41.1mm
RS Stock No. 888-7940
Mfr. Part No.G4ODC5
BrandOpto 22
£13.11
Each
Units
G4 - - DC Digital Digital DC Voltage - - - 5 → 60 V dc 3 A Digital DC Output 48.8mm 12.2mm 41.1mm
RS Stock No. 888-7849
Mfr. Part No.G4IDC5
BrandOpto 22
£13.11
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. 888-7903
Mfr. Part No.G4OAC5A
BrandOpto 22
£14.21
Each
Units
G4 1 1 Digital Digital AC Voltage - - - 24 → 280 V ac 3 A Digital AC Output 48.8mm 12.2mm 41.1mm
RS Stock No. 888-7909
Mfr. Part No.G4OAC5
BrandOpto 22
£13.11
Each
Units
G4 1 1 Digital Digital AC Voltage - - - 12 → 140 V ac 3 A Digital AC Output 48.8mm 12.2mm 41.1mm
RS Stock No. 889-1769
Mfr. Part No.SNAP-SCM-485-422
BrandOpto 22
£349.67
Each
Units
SNAP - - - - SNAP PAC System 2 - - - Serial Communication 82.55mm 18.29mm 90.17mm
RS Stock No. 888-7896
Mfr. Part No.G4OAC24A
BrandOpto 22
£14.21
Each
Units
G4 1 1 Digital Digital AC Voltage - - - 24 → 280 V ac 3 A Digital AC Output 48.8mm 12.2mm 41.1mm
RS Stock No. 888-7852
Mfr. Part No.G4IDC5K
BrandOpto 22
£17.48
Each
Units
G4 - - Digital DC Voltage Digital - - - 2.5 → 16 V dc 50 (Sinking) mA Digital DC Input 48.8mm 12.2mm 41.1mm
RS Stock No. 888-7846
Mfr. Part No.G4IDC5D
BrandOpto 22
£13.11
Each
Units
G4 - - Digital DC Voltage Digital - - - 2.5 → 28 V dc 50 (Sinking) mA Digital DC Input 48.8mm 12.2mm 41.1mm
RS Stock No. 888-7827
Mfr. Part No.G4IAC5
BrandOpto 22
£13.11
Each
Units
G4 - - Digital AC Voltage Digital - - - 90 → 140 V ac/dc 50 (Sinking) mA Digital AC Input 48.8mm 12.2mm 41.1mm
RS Stock No. 888-7830
Mfr. Part No.G4IDC24
BrandOpto 22
£13.11
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. 888-7388
Mfr. Part No.240D45
BrandOpto 22
£40.79
Each
Units
Power Solid State Relay Unit - - - 24 → 240 V ac - - - 24 → 240 V ac - Solid State Relay 44.5mm 57.2mm 24.5mm
RS Stock No. 888-7537
Mfr. Part No.AD7
BrandOpto 22
£93.24
Each
Units
- - - Analogue DC Voltage to Digital - - - - 0 → 10 V dc - - - - -
RS Stock No. 889-1025
Mfr. Part No.SNAP-ODC5-I
BrandOpto 22
£46.63
Each
Units
SNAP - 4 - Digital DC Voltage SNAP PAC System 4 - 5 → 60 V dc 3 A Digital DC Output 82.55mm 18.29mm 90.17mm
RS Stock No. 888-7505
Mfr. Part No.AD18T
BrandOpto 22
£186.49
Each
Units
- - - - - - - - - - - - - -
RS Stock No. 888-7587
Mfr. Part No.DA4T
BrandOpto 22
£155.90
Each
Units
- - - - Digital to Voltage - - - 0 → 5 V dc 25 mA - - - -
RS Stock No. 888-7347
Mfr. Part No.120D45
BrandOpto 22
£34.97
Each
Units
Power - - - DC Output - - - 12 → 140 V ac - Solid State Relay 44.5mm 57.2mm 24.5mm
RS Stock No. 888-8069
Mfr. Part No.G4SWIN
BrandOpto 22
£27.96
Each
Units
- - - - - - - - - - - 12.2mm - 48.8mm
RS Stock No. 889-0905
Mfr. Part No.SNAP-IDC5-FAST-A
BrandOpto 22
£85.64
Each
Units
- - - - - - - - - - - 18.29mm - 82.55mm
RS Stock No. 888-7820
Mfr. Part No.G4IAC5A
BrandOpto 22
£14.21
Each
Units
G4 - - Digital AC Voltage Digital - - - 180 → 280 V ac/dc 50 (Sinking) mA Digital AC Input 48.8mm 12.2mm 41.1mm