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. 820-1024
Mfr. Part No.TM2AMM6HT
HK$3,103.88
Each
units
Modicon M238 logic controller 4 2 Voltage - Megelis XBT GC - - - 4 → 20 mA Input/Output analog - - -
RS Stock No. 662-3561
Mfr. Part No.6ES7138-4CA01-0AA0
BrandSiemens
HK$172.42
Each
units
ET200S - - - Current, Potential, Voltage ET200S Series - - 24 V dc - Power Module 81mm 15mm 52mm
RS Stock No. 746-6536
Mfr. Part No.6ES7321-1BH10-0AA0
BrandSiemens
HK$2,516.80
Each
units
- 16 - Digital - S7-300 Series - - 24 V dc - Input 125mm 40mm 120mm
RS Stock No. 662-3595
Mfr. Part No.6ES7134-4GB01-0AB0
BrandSiemens
HK$1,624.48
Each
units
SIMATIC ET 200S 2 - Analogue - SIMATIC ET 200S Series 2 - 24 V dc - - 81mm 15mm 52mm
RS Stock No. 736-1444
Mfr. Part No.LAN module
BrandGrasslin
HK$3,292.20
Each
units
- - - - - Talento 892 - - - - Lan Module - - -
RS Stock No. 539-0774
Mfr. Part No.FX3U-4AD-TC-ADP
BrandMitsubishi
HK$3,409.12
Each
units
FX3U Series 4 - Analogue, J Type, K Type Digital, J Type, K Type FX3U Series - - 5 V dc, 24 V dc - Analogue Temperature Input Adapter 106mm 17.6mm 89.5mm
RS Stock No. 455-6923
Mfr. Part No.QX10
BrandMitsubishi
HK$1,658.80
Each
units
MELSEC Q 16 - Digital - MELSEC Q Series 16 - 100 → 120 V ac - - 98mm 27.4mm 90mm
RS Stock No. 815-5915
Mfr. Part No.FP2-SL2
BrandPanasonic
HK$4,837.52
Each
units
FP2 Series 128 128 - - FP2 Series 128 - 24 V dc 1.6 A - - - -
RS Stock No. 453-2551
Mfr. Part No.6ES7332-5HD01-0AB0
BrandSiemens
HK$6,394.96
Each
units
SIMATIC S7-300 Series - 4 - Analogue SIMATIC S7-300 Series 4 - 24 V dc - - 125mm 40mm 120mm
RS Stock No. 434-1850
Mfr. Part No.6ES7231-7PD22-0XA0
BrandSiemens
HK$7,552.57
Each
units
S7-200 4 - Analogue - S7-231 Series - - 24 V dc - Input Module 80mm 71.2mm 62mm
RS Stock No. 674-1962
Mfr. Part No.TM2DRA16RT
HK$1,939.42
Each
units
Modicon M238, Twido Series - 16 - Digital Modicon M238, Twido Series - - 230 V ac - Output Module 90mm 24mm 70mm
RS Stock No. 405-6209
Mfr. Part No.4825 0093
BrandSocomec
HK$1,632.90
Each
units
- - 4 - Analogue - - - - - - - - -
RS Stock No. 806-6890
Mfr. Part No.TMC2AQ2V
HK$924.56
Each
units
Modicon M221 2 - Analogue Current Modicon M221 - - 24 V dc 20 mA - - - -
RS Stock No. 746-6713
Mfr. Part No.6ES7360-3AA01-0AA0
BrandSiemens
HK$2,356.64
Each
units
6ES7 Series - - - - S7-300 Series - - - - - - - -
RS Stock No. 320-9109
Mfr. Part No.FX2N-16EX-ES/UL
BrandMitsubishi
HK$1,939.08
Each
units
FX2N Series 16 - Digital - FX2N Series - - 24 V dc - Input Module 90mm 40mm 87mm
RS Stock No. 806-6893
Mfr. Part No.TMC2AQ2C
HK$663.52
Each
units
Modicon M221 2 - Analogue Current Modicon M221 - - 24 V dc 20 mA - - - -
RS Stock No. 453-2646
Mfr. Part No.6ES7322-5HF00-0AB0
BrandSiemens
HK$2,731.99
Each
units
SIMATIC S7-300 Series - 8 - Digital, Relay S7-300 Series 8 - 24 V dc, 24 → 240 V ac 5 A - 125mm 40mm 120mm
RS Stock No. 662-3494
Mfr. Part No.6ES7132-4BD02-0AA0
BrandSiemens
HK$435.54
Each
units
SIMATIC ET 200S - 4 - Digital SIMATIC ET 200S Series 4 - 24 V dc 500 mA - 81mm 15mm 52mm
RS Stock No. 662-3167
Mfr. Part No.6ES7131-4BD01-0AA0
BrandSiemens
HK$319.95
Each
units
SIMATIC ET 200S 4 - Digital - SIMATIC ET 200S Series 4 - 24 V dc - - 81mm 15mm 52mm
RS Stock No. 510-1423
Mfr. Part No.CJ1W-DA041
BrandOmron
HK$7,338.76
Each
units
CJ Series - 4 - Analogue CJ Series 4 - 24 V dc 12 mA - 90mm 31mm 65mm
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