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. 787-7970
Mfr. Part No.6ES7231-4HF32-0XB0
BrandSiemens
TWD13,025.00
Each
units
SM 1231 8 - Analogue Analogue SIMATIC S7-1200 Series - - 24 V dc - - 100mm 45mm 75mm
RS Stock No. 770-2539
Mfr. Part No.TM5SDM12DT
TWD4,991.00
Each
units
TM5 8 4 Digital Digital, Transistor Modicon LMC058, Modicon M258 - - 24 V dc 12 A - 99mm 12.5mm 75mm
RS Stock No. 888-7530
Mfr. Part No.AD6HS
BrandOpto 22
TWD4,110.00
Each
units
- - - Analogue DC Voltage to Digital - - - - 0 → 5 V dc - - - - -
RS Stock No. 855-1360
Mfr. Part No.2862194
TWD10,164.00
Each
units
IB IL AO 2/SF-2MBD-PAC - 2 - Analogue - - - 24 V dc - - 136.8mm 48.8mm 71.5mm
RS Stock No. 662-3586
Mfr. Part No.6ES7134-4GB11-0AB0
BrandSiemens
TWD6,385.00
Each
units
SIMATIC ET 200S 2 - Analogue - SIMATIC ET 200S Series 2 - 24 V dc - - 81mm 15mm 52mm
RS Stock No. 770-2564
Mfr. Part No.TM5SPS1F
TWD2,428.00
Each
units
TM5 Series - - - - Modicon LMC058, Modicon M258 - - - - - 99mm 12.5mm 75mm
RS Stock No. 893-0678
Mfr. Part No.1315240000
BrandWeidmuller
TWD2,231.00
Each
units
- - 8 - Digital - 8 - - 4 (Per Module) A, 500 (Per Channel) mA Digital Output 120mm 11.5mm 76mm
RS Stock No. 434-1759
Mfr. Part No.6ES72231BF220XA0
BrandSiemens
TWD10,170.00
Each
units
S7-200 Series 4 4 Digital Digital S7-200 Series - - 24 V dc - I/O Module - - -
RS Stock No. 746-6549
Mfr. Part No.6ES7321-1EL00-0AA0
BrandSiemens
TWD20,100.00
Each
units
- 32 - Digital - S7-300 Series - - 120 V ac - Input 125mm 40mm 120mm
RS Stock No. 893-6777
Mfr. Part No.1334780000
BrandWeidmuller
TWD873.00
Each
units
- - - - - Remote I/O - - - - Auxiliary Module 120mm 11.5mm 76mm
RS Stock No. 653-6246
Mfr. Part No.2313067
TWD15,628.00
Each
units
PSI-DATA/BASIC-MODEM/RS232 - - - - - - - 24 V dc - - 99mm 22.5mm 114.5mm
RS Stock No. 382-2487
Mfr. Part No.TSXASZ200
TWD22,123.00
Each
units
Modicon TSX Micro - 2 (Channel) - Analogue Modicon TSX 2 - - 0 → 20 mA - - - -
RS Stock No. 855-3414
Mfr. Part No.2819765
TWD10,675.00
Each
units
IB IL INC-IN-2MBD-PAC 1 - - - - - - - - - 140.5mm 24.4mm 71.5mm
RS Stock No. 614-0586
Mfr. Part No.6GK5202-2BB00-2BA3
BrandSiemens
TWD53,781.00
Each
units
6GK5 202 - - - - - 11 - 24 V dc - - 125mm 60mm 124mm
RS Stock No. 136-2801
Mfr. Part No.NXDA2203
BrandOmron
TWD7,662.00
Each
units
NX - 2 - Analogue CJ PLC, EtherCAT Coupler Unit, NX Series CPU Unit 2 (Output) - - 4 → 20 mA Output 12mm 71mm 100mm
RS Stock No. 888-7937
Mfr. Part No.G4ODC24
BrandOpto 22
TWD577.00
Each
units
G4 - - DC Digital Digital DC Voltage - - - 5 → 60 V dc 3 A Digital DC Output 48.8mm 12.2mm 41.1mm
RS Stock No. 674-1921
Mfr. Part No.TM2AMI4LT
TWD11,509.00
Each
units
Modicon M238 4 - Analogue - Modicon M238 4 - 24 V dc - - 0.9in 2.75in 3.5in
RS Stock No. 875-5694
Mfr. Part No.FX5-8EX/ES
BrandMitsubishi
TWD4,564.00
Each
units
FX5 8 - Sink, Source - FX5U CPU Module, FX5UC CPU Module - - - - Input 40mm 90mm 83mm
RS Stock No. 136-2806
Mfr. Part No.NXPF0630
BrandOmron
TWD1,214.00
Each
units
NX - - - - EtherCAT Coupler Unit, NX Series CPU Unit - - - 4 A - 12mm 71mm 100mm
RS Stock No. 508-3915
Mfr. Part No.750513
BrandWago
TWD3,440.00
Each
units
I/O SYSTEM 750 - 2 (Channel) - Digital, Relay 750 Series - - 230 V dc - Output Module 100mm 12mm 64mm