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. 147-988
Mfr. Part No.BMXAMI0410
HK$3,865.59
Each
units
M340 4 - Analogue - M340 Series 4 - 24 V dc - - - - -
RS Stock No. 148-004
Mfr. Part No.BMXAMO0210
HK$3,114.96
Each
units
M340 - 2 - Analogue M340 Series 2 - 24 V dc - - - - -
RS Stock No. 806-6887
Mfr. Part No.TMC2AI2
HK$932.05
Each
units
Modicon M221 2 - Analogue Current Modicon M221 - - 24 V dc 20 mA - - - -
RS Stock No. 674-1952
Mfr. Part No.TM2DDO32TK
HK$9,122.96
Each
units
Modicon M238, Twido Series - 32 - Digital Modicon M238, Twido Series - - 24 V dc 400 mA Output Module 92.3mm 33.5mm 94.5mm
RS Stock No. 253-2335
Mfr. Part No.TSXDMZ28DR
HK$5,319.60
Each
units
Modicon TSX Micro 16 12 Discrete Discrete Modicon TSX 28 - 100 → 120 V ac - - - - -
RS Stock No. 806-6904
Mfr. Part No.TMC4AI2
HK$1,201.20
Each
units
M241 Series 2 - Analogue - Modicon M241 - - 0 → 10 V 0 → 20 mA - - - -
RS Stock No. 806-6976
Mfr. Part No.TM3DM8R
HK$1,622.32
Each
units
TM3 Series 4 4 - Relay Modicon M221, Modicon M241, Modicon M251 8 - 24 → 240 V 2 A - 90mm 23.6mm 70mm
RS Stock No. 615-2371
Mfr. Part No.SR2MOD02
HK$4,862.00
Each
units
- - - - - - - - 12 → 24 V dc - GSM modem 73mm 54.5mm 39.5mm
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. 615-2387
Mfr. Part No.SR2COM01
HK$1,521.52
Each
units
Zelio Logic - - - - - - - 12 → 24 V dc - Relay 107.6mm 72mm 59.5mm
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. 674-1946
Mfr. Part No.TM2DDI32DK
HK$4,629.76
Each
units
Twido Series 32 - Digital - Twido Series - - 24 V dc - Input Module 92.3mm 33.5mm 94.5mm
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. 806-6954
Mfr. Part No.TM3DQ8T
HK$2,296.44
Each
units
TM3 Series - 8 - Source, Transistor Modicon M221, Modicon M241, Modicon M251 - - 24 V 500 mA - 90mm 23.6mm 70mm
RS Stock No. 147-994
Mfr. Part No.BMXART0414
HK$4,413.81
Each
units
M340 4 - Analogue - M340 Series 4 - 24 V dc - - - - -
RS Stock No. 806-6957
Mfr. Part No.TM3DQ16R
HK$2,327.25
Each
units
TM3 Series - 16 - Relay Modicon M221, Modicon M241, Modicon M251 - - 24 → 240 V 2 A - 90mm 23.6mm 70mm
RS Stock No. 609-8558
Mfr. Part No.TSXAEZ801
HK$7,104.24
Each
units
Modicon TSX Micro 8 (Channel) - Analogue - Modicon TSX 8 - - - - - - -
RS Stock No. 806-6988
Mfr. Part No.TM3DM24R
HK$2,715.99
Each
units
TM3 Series 16 8 - Relay Modicon M221, Modicon M241, Modicon M251 24 - 24 → 240 V 2 A - 90mm 39.1mm 70mm
RS Stock No. 148-098
Mfr. Part No.BMXDDO6402K
HK$5,114.96
Each
units
M340 - 64 - Discrete, Transistor M340 Series 64 - 24 V dc - - - - -
RS Stock No. 770-2447
Mfr. Part No.TM5C24D18T
HK$4,553.12
Each
units
TM5 24 18 Digital Digital, Transistor Modicon LMC058, Modicon M258 - - 24 V dc 9 A - 99mm 62.5mm 75mm