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. 528-0633
Mfr. Part No.2832771
$287.38
Each
units
FL SWITCH SF 8TX 8 - - - - - - 24 V dc - - 94.3mm 135mm 30mm
RS Stock No. 901-0826
Mfr. Part No.2903805
$685.78
Each
units
TC MOBILE I/O X200 2 4 Analogue, Digital Relay PSI Modem SMS Relay 6 - 0 → 60 V dc 6 A Analogue, Digital 71.6mm 62.2mm 89.7mm
RS Stock No. 528-0447
Mfr. Part No.2832962
$1,134.62
Each
units
ILB ETH 24 DI16 DIO16-2TX 16 16 Digital Digital ILB ETH Series 32 - 24 V dc 500 mA - 141mm 156mm 55mm
RS Stock No. 528-0453
Mfr. Part No.2862343
$898.29
Each
units
ILB IB 24 DI32 32 - Digital - INTERBUS 32 - 24 V dc - - 140.5mm 156mm 57mm
RS Stock No. 855-3271
Mfr. Part No.2700459
$409.00
Each
units
IB IL AI 4/U-PAC 4 - Analogue - - - - 24 V dc - - 119.8mm 12.2mm 71.5mm
RS Stock No. 893-7830
Mfr. Part No.2701955
$1,611.12
Each
units
IB STME 24 AI 4/EF 4 - Analogue Voltage - - 4 - -10 → 10 V dc, 0 → 10 V dc - Analogue Input 118mm 116mm 117mm
RS Stock No. 855-1405
Mfr. Part No.2863931
$408.75
1 Box of 4
Box(es)
IB IL 24 DO 4-ME - 4 - Digital - - - - 2 A - 119.8mm 12.2mm 71.5mm
RS Stock No. 764-6256
Mfr. Part No.2901535
$437.78
Each
units
RAD-DI4-IFS 4 - Digital Digital RAD-2400-IFS Wireless Module - - 19.2 → 30.5 V dc - - 99mm 17.5mm 114.5mm
RS Stock No. 710-6341
Mfr. Part No.2313643
$1,540.48
Each
units
PSI-MODEM-SHDSL/ETH - - - - - - - 28 V dc, 240 V ac - - 86mm 12.3mm 96mm
RS Stock No. 124-3336
Mfr. Part No.2702291
$583.21
Each
units
AXL F DI16/1 DO8/2-2A 2H 16 (Digital) 8 (Digital) Digital Digital Axioline F Station 24 - 11 → 30 V dc 2 (Per Channel) A I/O Module 35mm 54mm 129.9mm
RS Stock No. 893-7834
Mfr. Part No.2701956
$1,659.69
Each
units
IB STME 24 BAI 8/EF 8 - Analogue Voltage - - 8 - 0 → 50 V dc - Analogue Input 118mm 116mm 117mm
RS Stock No. 696-2137
Mfr. Part No.PSI-MODEM-GSM/ETH
$1,403.96
Each
units
PSI-MODEM-GSM/ETH - - - - - - - 24 V dc - - 99mm 35mm 114.5mm
RS Stock No. 893-7843
Mfr. Part No.2700839
$2,124.85
Each
units
IB ST 24 AO 4/EF - 4 - Analogue - 4 - -10 → 10 V dc, 0 → 10 V dc 0 → 20 mA, 4 → 20 mA Analogue Output 118mm 116mm 117mm
RS Stock No. 855-1373
Mfr. Part No.2862987
$47.72
Each
units
IB IL PD 24V-PAC - - - - - - - 19.2 → 30 V dc - - 119.8mm 12.2mm 71.5mm
RS Stock No. 124-3347
Mfr. Part No.2904909
$1,231.55
Each
units
RAD-868-IFS - 1 (Analogue), 1 (Digital) - Analogue, Digital Large System & Networks 14 - 0 → 3 V 500 mA Wireless I/O Module 17.5mm 99mm 114.5mm
RS Stock No. 528-0627
Mfr. Part No.2832849
$626.05
Each
units
FL SWITCH SF 16TX - - - - - - - 24 V dc - - 94.3mm 205mm 30mm
RS Stock No. 366-4427
Mfr. Part No.2760623
$178.76
Each
units
PSM PTK - - - - - - - 28 V dc, 240 V ac - - 86mm 12.3mm 96mm
RS Stock No. 893-7837
Mfr. Part No.2700838
$2,124.85
Each
units
IB ST 24 AI 4/EF 4 - Analogue Voltage - ST Station 4 - -10 → 10 V dc, 0 → 10 V dc - Analogue Input 118mm 116mm 117mm
RS Stock No. 901-0817
Mfr. Part No.2903806
$934.89
Each
units
TC MOBILE I/O X200 AC 4 4 Digital Relay PSI Modem SMS Relay 8 - 125 V dc, 250 V ac 5 A Digital 71.6mm 62.2mm 89.7mm
RS Stock No. 855-3322
Mfr. Part No.2701161
$56.05
Each
units
IB IL 24 PWR IN-XC-PAC - - - - - - - - - - 119.8mm 12.2mm 71.5mm