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. 893-7799
Mfr. Part No.2700608
$726.31
Each
units
AXL F DOR4/2 AC/220DC 1F - 4 - Relay Axioline F Station 4 - 230 V ac 32 (Module) A, 8 (Channel) A Digital Output 53.6mm 126.1mm 54mm
RS Stock No. 855-3451
Mfr. Part No.2861373
$76.37
Each
units
IB IL 24 SEG/F-PAC - - - - - - - 19.2 30 V dc - - 119.8mm 12.2mm 71.5mm
RS Stock No. 901-0826
Mfr. Part No.2903805
$1,231.55
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. 893-7795
Mfr. Part No.2700684
$955.39
Each
units
AXL F DI8/2 110/220DC 1F 8 - Digital Voltage - Axioline F Station 8 - 110/220 V dc - Digital Input 53.6mm 126.1mm 54mm
RS Stock No. 893-7830
Mfr. Part No.2701955
$1,788.34
Each
units
IB STME 24 AI 4/EF 4 - Analogue Voltage - - 4 - 0 10 V dc, -10 10 V dc - Analogue Input 118mm 116mm 117mm
RS Stock No. 528-0576
Mfr. Part No.2862385
$1,041.93
Each
units
ILB IB 24 DI16 DO16 16 16 Digital Digital INTERBUS 32 - 24 V dc 500 mA - 140.5mm 156mm 57mm
RS Stock No. 855-1382
Mfr. Part No.2862990
$53.46
Each
units
IB IL PD GND-PAC - - - - - - - - - - 119.8mm 12.2mm 71.5mm
RS Stock No. 855-3460
Mfr. Part No.2861535
$106.90
Each
units
IB IL 230 PWR IN-PAC - - - - - - - 207 253 V ac - - 119.8mm 36.6mm 71.5mm
RS Stock No. 855-3322
Mfr. Part No.2701161
$62.79
Each
units
IB IL 24 PWR IN-XC-PAC - - - - - - - - - - 119.8mm 12.2mm 71.5mm
RS Stock No. 855-3454
Mfr. Part No.2861409
$122.18
Each
units
IB IL 24 SEG-ELF-PAC - - - - - - - 19.2 30 V dc - - 119.8mm 12.2mm 71.5mm
RS Stock No. 575-024
Mfr. Part No.2701072
$142.55
Each
units
NLC-IO-6I-04QTP-01A 6 4 Digital Digital - - - 24 V dc - I/O Module 103.5mm 40mm 43mm
RS Stock No. 124-3352
Mfr. Part No.2906599
$32.06
Each
units
IOA AI/AO/BFI/DS/0.5A/EX 1 (Analogue) 1 (Analogue) Analogue Analogue Field Devices 2 - - - I/O Module 10.3mm 64.2mm 72.9mm
RS Stock No. 855-3492
Mfr. Part No.2861894
$106.90
Each
units
IB IL 24 PWR IN/F-D-PAC - - - - - - - 19.2 30 V dc - - 119.8mm 12.2mm 71.5mm
RS Stock No. 855-3515
Mfr. Part No.2862084
$962.18
Each
units
IB IL RS 232-2MBD-PAC - - - - - - - 19.2 30 V dc - - 136.8mm 24.4mm 71.5mm
RS Stock No. 855-1424
Mfr. Part No.2878340
$729.69
Each
units
IB IL 24 DO 32/HD-NPN-PAC - 32 - Digital - - - - 8 A - 119.8mm 48.8mm 71.5mm
RS Stock No. 528-0453
Mfr. Part No.2862343
$1,006.30
Each
units
ILB IB 24 DI32 32 - Digital - INTERBUS 32 - 24 V dc - - 140.5mm 156mm 57mm
RS Stock No. 855-1373
Mfr. Part No.2862987
$53.46
Each
units
IB IL PD 24V-PAC - - - - - - - 19.2 30 V dc - - 119.8mm 12.2mm 71.5mm
RS Stock No. 855-1345
Mfr. Part No.2862136
$76.37
Each
units
IB IL 24 PWR IN/2-F-PAC - - - - - - - 19.2 → 30 V dc - - 119.8mm 12.2mm 71.5mm
RS Stock No. 855-3329
Mfr. Part No.2701164
$1,033.45
Each
units
IB IL AO 4/8/U/BP-XC-PAC - 8 - Analogue - - - - - - 136.8mm 48.8mm 71.5mm
RS Stock No. 893-7834
Mfr. Part No.2701956
$1,842.26
Each
units
IB STME 24 BAI 8/EF 8 - Analogue Voltage - - 8 - 0 50 V dc - Analogue Input 118mm 116mm 117mm