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. 320-9109
Mfr. Part No.FX2N-16EX-ES/UL
BrandMitsubishi
SGD264.28
Each
units
FX2N Series 16 - Digital - FX2N Series - - 24 V dc - Input Module 90mm 40mm 87mm
RS Stock No. 455-6822
Mfr. Part No.QX80
BrandMitsubishi
SGD245.59
Each
units
MELSEC Q 16 - Digital - MELSEC Q Series 16 - 24 V dc - - 98mm 27.4mm 90mm
RS Stock No. 455-6838
Mfr. Part No.QY80
BrandMitsubishi
SGD280.17
Each
units
MELSEC Q - 16 - Transistor MELSEC Q Series - - 12 → 24 V dc - Output Module 98mm 27.4mm 90.17mm
RS Stock No. 492-963
Mfr. Part No.FX2N-2DA
BrandMitsubishi
SGD463.70
Each
units
FX1N Series, FX3G Series, FX3U Series - 2 - Analogue FX1N Series, FX3G Series, FX3U Series 2 - 5 V dc, 24 V dc 4 → 20 mA - 90mm 55mm 87mm
RS Stock No. 320-9121
Mfr. Part No.FX2N-16EYR-ES/UL
BrandMitsubishi
SGD343.13
Each
units
FX2N Series - 16 - Relay FX2N Series - - 24 V dc - Output Module 90mm 40mm 87mm
RS Stock No. 539-0768
Mfr. Part No.FX3U-4AD-PT-ADP
BrandMitsubishi
SGD530.63
Each
units
MELSEC FX 4 (PT100) - Analogue Relay, Transistor MELSEC FX Series 4 - 5 → 24 V dc - - 90mm 17.6mm 89.5mm
RS Stock No. 455-6939
Mfr. Part No.QY10
BrandMitsubishi
SGD320.74
Each
units
MELSEC Q - 16 - Digital, Relay MELSEC Q Series 16 - 24 V dc, 250 V ac - - 98mm 27.4mm 90mm
RS Stock No. 705-4928
Mfr. Part No.FX3U-4DA
BrandMitsubishi
SGD719.92
Each
units
MELSEC FX - 4 - Analogue MELSEC FX Series 4 - 5 V dc, 24 V dc 0 → 20 mA - 90mm 55mm 87mm
RS Stock No. 705-4925
Mfr. Part No.FX3U-4AD
BrandMitsubishi
SGD442.41
Each
units
MELSEC FX 4 - Analogue - MELSEC FX Series 4 - 5 V dc, 24 V dc - - 90mm 55mm 87mm
RS Stock No. 320-9137
Mfr. Part No.FX2N-32ER-ES/UL
BrandMitsubishi
SGD527.53
Each
units
FX2N Series 16 16 - - FX2N Series - - 100 → 240 V ac - I/O Module 90mm 150mm 87mm
RS Stock No. 875-5698
Mfr. Part No.FX5-8EYR/ES
BrandMitsubishi
SGD230.03
Each
units
FX5 - 8 - Relay, Transistor FX5U CPU Module, FX5UC CPU Module - - - - Output 40mm 90mm 83mm
RS Stock No. 455-6945
Mfr. Part No.QY81P
BrandMitsubishi
SGD565.19
Each
units
MELSEC Q - 32 - Digital, Transistor MELSEC Q Series 32 - 12 → 24 V dc - - 98mm 27.4mm 90mm
RS Stock No. 539-0746
Mfr. Part No.FX3U-4DA-ADP
BrandMitsubishi
SGD606.44
Each
units
MELSEC FX - 4 - Analogue, Relay, Transistor MELSEC FX Series 4 - 5 → 24 V dc - - 90mm 17.6mm 89.5mm
RS Stock No. 320-9143
Mfr. Part No.FX2N-48ER-ES/UL
BrandMitsubishi
SGD881.89
Each
units
FX2N Series 24 24 - - FX2N Series - - 100 → 240 V ac - I/O Module 90mm 150mm 87mm
RS Stock No. 539-0960
Mfr. Part No.FX3U-ENET
BrandMitsubishi
SGD861.20
Each
units
FX3U Series - - - - FX3U Series 8 - 24 V dc - Ethernet Communications Module 90mm 55mm 87mm
RS Stock No. 539-0730
Mfr. Part No.FX3U-4AD-ADP
BrandMitsubishi
SGD411.38
Each
units
FX3U Series 4 - Analogue - FX3U Series - - 5 V dc, 24 V dc - Analogue I/O Adapter 106mm 17.6mm 89.5mm
RS Stock No. 320-9115
Mfr. Part No.FX2N-16EYT-ESS/UL
BrandMitsubishi
SGD325.11
Each
units
FX2N Series 16 16 Analogue Transistor FX2N Series - - 24 V dc - Output Module 90mm 40mm 87mm
RS Stock No. 875-5705
Mfr. Part No.FX5-16EYR/ES
BrandMitsubishi
SGD277.04
Each
units
FX5 - 16 - Relay, Transistor FX5U CPU Module, FX5UC CPU Module - - - - Output 40mm 90mm 83mm
RS Stock No. 875-5714
Mfr. Part No.FX5-16EYT/ESS
BrandMitsubishi
SGD342.22
Each
units
FX5 - 16 - Relay, Transistor FX5U CPU Module, FX5UC CPU Module - - - - Output 40mm 90mm 83mm
RS Stock No. 539-0954
Mfr. Part No.FX3U-64DP-M
BrandMitsubishi
SGD966.55
Each
units
FX3U Series - - - - FX3U Series 8 - 24 V dc - Master PROFIBUS/DP Communications Module 90mm 43mm 87mm