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. 148-105
Mfr. Part No.BMXDRA1605
$645.66
Each
units
M340 - 16 - Discrete, Relay M340 Series 16 - 24 V dc, 24 → 240 V ac - - - - -
RS Stock No. 148-206
Mfr. Part No.BMXDDI3202K
$763.98
Each
units
M340 32 - Discrete - M340 Series 32 - 24 V dc - - - - -
RS Stock No. 548-066
Mfr. Part No.BMXAMM0600
$1,585.00
Each
units
Modicon M340 Series 4 2 Analogue Analogue Modicon M340 6 - 24 V dc 0 → 20 mA Mixed Analogue I/O Module 307.6mm 100mm 140mm
RS Stock No. 147-988
Mfr. Part No.BMXAMI0410
$903.72
Each
units
M340 4 - Analogue - M340 Series 4 - 24 V dc - - - - -
RS Stock No. 148-183
Mfr. Part No.BMXDDI1602
$418.20
Each
units
M340 16 - Discrete - M340 Series 16 - 24 V dc - - - - -
RS Stock No. 382-2487
Mfr. Part No.TSXASZ200
$1,017.87
Each
units
Modicon TSX Micro - 2 (Channel) - Analogue Modicon TSX 2 - - 0 → 20 mA - - - -
RS Stock No. 615-2371
Mfr. Part No.SR2MOD02
$859.96
Each
units
- - - - - - - - 12 → 24 V dc - GSM modem 73mm 54.5mm 39.5mm
RS Stock No. 148-127
Mfr. Part No.BMXDDM16022
$356.69
Each
units
M340 8 8 Discrete Discrete, Transistor M340 Series 16 - 24 V dc - - - - -
RS Stock No. 806-6881
Mfr. Part No.TMC2TI2
$190.19
Each
units
Modicon M221 2 - Analogue Current Modicon M221 - - 24 V dc 20 mA - - - -
RS Stock No. 806-6887
Mfr. Part No.TMC2AI2
$190.19
Each
units
Modicon M221 2 - Analogue Current Modicon M221 - - 24 V dc 20 mA - - - -
RS Stock No. 674-1918
Mfr. Part No.TM2ALM3LT
$553.76
Each
units
Modicon M238, Twido Series 1 1 Analogue Analogue Modicon M238, Twido Series - - 24 V dc - I/O Module 95.6mm 27.3mm 94.5mm
RS Stock No. 148-004
Mfr. Part No.BMXAMO0210
$561.13
Each
units
M340 - 2 - Analogue M340 Series 2 - 24 V dc - - - - -
RS Stock No. 147-887
Mfr. Part No.BMXDDM16025
$389.31
Each
units
M340 8 8 Discrete Discrete, Relay M340 Series 16 - 24 V dc - - - - -
RS Stock No. 806-6935
Mfr. Part No.TM3DI16
$310.00
Each
units
TM3 Series 16 - - - Modicon M221, Modicon M241, Modicon M251 - - 24 V - - 90mm 23.6mm 70mm
RS Stock No. 147-641
Mfr. Part No.BMXDDO1602
$304.49
Each
units
M340 - 16 - Discrete, Transistor M340 Series 16 - 24 V dc - - - - -
RS Stock No. 612-0201
Mfr. Part No.OTB1S0DM9LP
$481.56
Each
units
Twido Series 12 2 (Solid State), 6 (Relay) Analogue Analogue, Relay Twido Series 20 - 24 V dc - - 55mm 70mm 90mm
RS Stock No. 253-2335
Mfr. Part No.TSXDMZ28DR
$2,029.45
Each
units
Modicon TSX Micro 16 12 Discrete Discrete Modicon TSX 28 - 100 → 120 V ac - - - - -
RS Stock No. 674-1940
Mfr. Part No.TM2DDI8DT
$295.52
Each
units
Twido Series 8 - Digital - Twido Series - - 24 V dc - Input Module 90mm 24mm 70mm
RS Stock No. 674-1937
Mfr. Part No.TM2AMO1HT
$397.84
Each
units
Modicon M238, Twido Series - 1 - Analogue Modicon M238, Twido Series - - 24 V dc - Output Module 95.6mm 27.3mm 94.5mm
RS Stock No. 806-6948
Mfr. Part No.TM3DQ8RG
$254.30
Each
units
TM3 Series - 8 - Relay Modicon M221, Modicon M241, Modicon M251 - - 24 → 240 V 2 A - 90mm 23.6mm 70mm