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. 889-1615
Mfr. Part No.SNAP-PAC-R1
BrandOpto 22
TWD38,751.00
Each
units
SNAP PAC R - - - - SNAP PAC System - - - - Analogue, Digital 84.15mm 44.44mm 106.37mm
RS Stock No. 888-7903
Mfr. Part No.G4OAC5A
BrandOpto 22
TWD765.00
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. 888-7357
Mfr. Part No.240D10
BrandOpto 22
TWD1,088.00
Each
units
Power - - - DC Output - - - 24 → 280 V ac - Solid State Relay 44.5mm 57.2mm 24.5mm
RS Stock No. 889-0858
Mfr. Part No.SNAP-IAC5FM
BrandOpto 22
TWD3,885.00
Each
units
- - - - - - - - - - - 18.29mm - 82.55mm
RS Stock No. 889-0892
Mfr. Part No.SNAP-IDC5DFM
BrandOpto 22
TWD3,885.00
Each
units
- - - - - - - - - - - 18.29mm - 82.55mm
RS Stock No. 889-0735
Mfr. Part No.SNAP-B8M
BrandOpto 22
TWD5,114.00
Each
units
SNAP B - - - - SNAP I/O Modules - - - - - 234.7mm 99.31mm 12.7mm
RS Stock No. 889-0937
Mfr. Part No.SNAP-IDC-HT-16
BrandOpto 22
TWD14,995.00
Each
units
- - - - - - - - - - - 18.69mm - 82.55mm
RS Stock No. 888-7984
Mfr. Part No.G4PB16I
BrandOpto 22
TWD5,461.00
Each
units
G4 - - - - G4 I/O Modules 16 - - - - 228.6mm 101.6mm 58.9mm
RS Stock No. 889-0744
Mfr. Part No.SNAP-B8MC
BrandOpto 22
TWD6,167.00
Each
units
SNAP B - - - - SNAP I/O Modules - - - - - 234.95mm 112.01mm 12.7mm
RS Stock No. 888-8586
Mfr. Part No.SNAP-AIRTD
BrandOpto 22
TWD10,853.00
Each
units
SNAP 2 - Analogue RTD - SNAP PAC System 2 - - - Analogue Input 82.55mm 18.29mm 90.17mm
RS Stock No. 889-0864
Mfr. Part No.SNAP-IAC-K-16
BrandOpto 22
TWD14,995.00
Each
units
- - - - - - - - - - - 18.69mm - 82.55mm
RS Stock No. 889-0895
Mfr. Part No.SNAP-IDC5
BrandOpto 22
TWD2,089.00
Each
units
- - - - - - - - - - - 18.29mm - 82.55mm
RS Stock No. 888-8069
Mfr. Part No.G4SWIN
BrandOpto 22
TWD1,233.00
Each
units
- - - - - - - - - - - 12.2mm - 48.8mm
RS Stock No. 888-7997
Mfr. Part No.G4PB24
BrandOpto 22
TWD5,398.00
Each
units
G4 - - - - G4 I/O Modules 24 - - - - 190.5mm 158.8mm 58.9mm
RS Stock No. 888-7830
Mfr. Part No.G4IDC24
BrandOpto 22
TWD577.00
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. 888-7943
Mfr. Part No.G4ODC5A
BrandOpto 22
TWD706.00
Each
units
G4 - - DC Digital Digital DC Voltage - - - 5 → 200 V dc 1 A Digital DC Output 48.8mm 12.2mm 41.1mm
RS Stock No. 889-1031
Mfr. Part No.SNAP-ODC5R
BrandOpto 22
TWD2,096.00
Each
units
- - - - - - - - - - - 18.29mm - 82.55mm
RS Stock No. 889-1769
Mfr. Part No.SNAP-SCM-485-422
BrandOpto 22
TWD15,415.00
Each
units
SNAP - - - - SNAP PAC System 2 - - - Serial Communication 82.55mm 18.29mm 90.17mm
RS Stock No. 889-0876
Mfr. Part No.SNAP-IDC-32
BrandOpto 22
TWD14,170.00
Each
units
- - - - - - - - - - - 18.29mm - 82.55mm
RS Stock No. 888-7852
Mfr. Part No.G4IDC5K
BrandOpto 22
TWD771.00
Each
units
G4 - - Digital DC Voltage Digital - - - 2.5 → 16 V dc 50 (Sinking) mA Digital DC Input 48.8mm 12.2mm 41.1mm