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. 125-1092
Mfr. Part No.TMC2PACK01
HK$697.84
Each
units
Modicon M221 2 - Analogue - Modicon M221C 2 (Input) - 0 → 10 V - Analogue Input Cartridge Module 35mm 15mm 41mm
RS Stock No. 459-5423
Mfr. Part No.SRT2OD161
BrandOmron
HK$2,230.80
Each
units
SRT2 16 - Digital Mosfet, Relay, Transistor SRT2 Series 16 - 24 V dc 300 (Per Point) mA - 105mm 48mm 50mm
RS Stock No. 770-2472
Mfr. Part No.TM5SAI2TH
HK$2,997.28
Each
units
TM5 2 - Analogue - Modicon LMC058, Modicon M258 - - 24 V dc 30 mA - 99mm 12.5mm 75mm
RS Stock No. 855-3473
Mfr. Part No.2861658
HK$1,145.26
Each
units
IB IL DO 4 AC-1A-PAC - 4 - Digital - - - - 4 A - 119.8mm 48.8mm 71.5mm
RS Stock No. 893-6786
Mfr. Part No.1315770000
BrandWeidmuller
HK$172.74
Each
units
- - - - - Remote I/O - - - - Auxiliary Module 120mm 11.5mm 76mm
RS Stock No. 855-3458
Mfr. Part No.2861454
HK$508.97
Each
units
IB IL 120 PWR IN-PAC - - - - - - - 108 → 135 V ac - - 119.8mm 36.6mm 71.5mm
RS Stock No. 135-9281
Mfr. Part No.FX5-C16EX/DS
BrandMitsubishi
HK$1,138.28
Each
units
FX5 16 - DC - MELSEC iQ-F Series PLC 16 - 24 V dc - Input 20.1mm 90mm 87mm
RS Stock No. 770-2523
Mfr. Part No.TM5SDI4D
HK$480.48
Each
units
TM5 4 - Digital - Modicon LMC058, Modicon M258 - - 24 V dc - - 99mm 12.5mm 75mm
RS Stock No. 136-2795
Mfr. Part No.NXOD4256
BrandOmron
HK$1,098.12
Each
units
NX - 8 - Digital CJ PLC, EtherCAT Coupler Unit, NX Series CPU Unit 8 (Output) - 24 V dc 400 mA Output 12mm 71mm 100mm
RS Stock No. 889-1009
Mfr. Part No.SNAP-ODC-32-SNK
BrandOpto 22
HK$3,529.70
Each
units
SNAP - 32 - Digital DC Voltage SNAP PAC System 32 - 5 → 60 V dc 250 mA Digital DC Output 82.55mm 18.29mm 82.8mm
RS Stock No. 855-3448
Mfr. Part No.2861357
HK$2,450.22
Each
units
IB IL RS 232-PAC - - - - - - - 19.2 → 30 V dc - - 136.8mm 24.4mm 71.5mm
RS Stock No. 705-4887
Mfr. Part No.FX3G-2AD-BD
BrandMitsubishi
HK$1,716.00
Each
units
MELSEC FX1N, MELSEC FX1S, MELSEC FX2N, MELSEC FX2NC, MELSEC FX3G, MELSEC FX3U, MELSEC FX3UC 2 - Analogue - MELSEC FX3G Series 2 - 0 → 10 V dc 4 → 20 mA - - - -
RS Stock No. 135-5214
Mfr. Part No.140ACI03000
HK$12,618.32
Each
units
- 8 - Analogue - Modicon PLC - - 1 → 5 V - Input - - -
RS Stock No. 855-1418
Mfr. Part No.2878120
HK$1,629.51
Each
units
IB IL 24 DI16-2MBD-PAC/SN** 16 - Digital - - - - - - - 140.5mm 48.8mm 71.5mm
RS Stock No. 705-4928
Mfr. Part No.FX3U-4DA
BrandMitsubishi
HK$4,856.28
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. 770-2554
Mfr. Part No.TM5SDO6T
HK$812.24
Each
units
TM5 - 6 - Digital, Transistor Modicon LMC058, Modicon M258 - - 24 V dc 12 A - 99mm 12.5mm 75mm
RS Stock No. 806-6941
Mfr. Part No.TM3DI32K
HK$1,438.47
Each
units
TM3 Series 32 - - - Modicon M221, Modicon M241, Modicon M251 - - 24 V - - 90mm 30.2mm 70mm
RS Stock No. 467-769
Mfr. Part No.6GK5786-2BA60-2AB0
BrandSiemens
HK$15,938.67
Each
units
6GK5 786 - - - - - 3 - 12 → 24 V dc, 100 → 240 V ac - - 251mm 251mm 72mm
RS Stock No. 770-2475
Mfr. Part No.TM5SAI4H
HK$4,198.48
Each
units
TM5 4 - Analogue - Modicon LMC058, Modicon M258 - - 24 V dc 63 mA - 99mm 12.5mm 75mm
RS Stock No. 893-6749
Mfr. Part No.1506930000
BrandWeidmuller
HK$2,236.29
Each
units
- - 4 - Analogue - 4 - - 85 mA Analogue Output 120mm 11.5mm 76mm
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