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. 855-3486
Mfr. Part No.2861768
TWD13,353.00
Each
units
IB IL IMPULSE-IN-PAC - - - - - - - - - - 135mm 12.2mm 71.5mm
RS Stock No. 528-0627
Mfr. Part No.2832849
TWD16,949.00
Each
units
FL SWITCH SF 16TX - - - - - - - 24 V dc - - 94.3mm 205mm 30mm
RS Stock No. 528-0649
Mfr. Part No.2832933
TWD21,888.00
Each
units
FL SWITCH SF 6TX/2FX 6 - - - - - - 24 V dc - - 115.3mm 135mm 30mm
RS Stock No. 855-1449
Mfr. Part No.2878971
TWD2,110.00
Each
units
IB IL 230 PWR IN/F-D-PAC - - - - - - - 207 → 253 V ac - - 119.8mm 36.6mm 71.5mm
RS Stock No. 648-5839
Mfr. Part No.2832726
TWD14,405.00
Each
units
FL SWITCH SF 7TX/FX - - - - - - - 24 V dc - - 115.3mm 135mm 30mm
RS Stock No. 528-0447
Mfr. Part No.2832962
TWD16,960.00
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. 696-2128
Mfr. Part No.2313478
TWD16,814.00
Each
units
FL COMSERVER BASIC 232/422/485 - - - - - - - 28 V dc, 240 V ac - - 86mm 12.3mm 96mm
RS Stock No. 855-1379
Mfr. Part No.2862961
TWD7,147.00
Each
units
IB IL 24 DO 16-PAC/SN - 16 - Digital - - - - 8 A - 140.5mm 48.8mm 71.5mm
RS Stock No. 855-3319
Mfr. Part No.2701159
TWD19,991.00
Each
units
IB IL AI 8/SF-XC-PAC 8 - Analogue - - - - 24 V dc - - - - -
RS Stock No. 528-0453
Mfr. Part No.2862343
TWD11,932.00
Each
units
ILB IB 24 DI32 32 - Digital - INTERBUS 32 - 24 V dc - - 140.5mm 156mm 57mm
RS Stock No. 855-3467
Mfr. Part No.2861470
TWD1,527.00
Each
units
IB IL 24 DO 2-PAC - 2 - Digital - - - - 1 A - 119.8mm 12.2mm 71.5mm
RS Stock No. 855-1452
Mfr. Part No.2897606
TWD20,862.00
Each
units
IB IL TEMP 4/8 RTD/EF-2MBD-PAC 8 - Analogue - - - - 24 V dc - - 136.8mm 48.8mm 71.5mm
RS Stock No. 855-3290
Mfr. Part No.2701152
TWD2,043.00
Each
units
IB IL 24 DI 4-XC-PAC 4 - Digital - - - - - - - 140.5mm 12.2mm 71.5mm
RS Stock No. 855-3397
Mfr. Part No.2737009
TWD3,323.00
Each
units
IB IL 24 FLM MULTI-PAC - - - - - - - - - - 136.8mm 12.2mm 71.5mm
New
RS Stock No. 190-2097
Mfr. Part No.2703994
TWD22,186.00
Each
units
IL PN BK DI8 DO4 2TX-PAC 8 4 Digital Digital - 4 (Output), 8 (Input) - 24 V ac 2 (per Module) A, 500 (per Channel) mA Bus Coupler 80mm 71.5mm 119.8mm
RS Stock No. 124-3349
Mfr. Part No.2906595
TWD3,527.00
Each
units
VIP/S/D25M/BASE 1-8/L/C/EX - - - - Foxboro I/A Series DCS 8 - - - Base Module 118.1mm 102.7mm 72.2mm
RS Stock No. 855-3518
Mfr. Part No.2862013
TWD7,246.00
Each
units
IB IL 24 DO 16-2MBD-PAC - 16 - Digital - - - - 8 A - 140.5mm 48.8mm 71.5mm
RS Stock No. 764-6252
Mfr. Part No.2901533
TWD14,028.00
Each
units
PLC-RPT- 24DC/21AU, RAD-DAIO6-IFS 1 (Analogue), 2 (Digital) 1 (Analogue), 2 (Digital) Analogue, Digital Analogue, Current, Digital, Relay, Voltage RAD-2400-IFS Wireless Module - - 19.2 → 30.5 V dc 20 mA - 99mm 17.5mm 114.5mm
RS Stock No. 855-3458
Mfr. Part No.2861454
TWD1,915.00
Each
units
IB IL 120 PWR IN-PAC - - - - - - - 108 → 135 V ac - - 119.8mm 36.6mm 71.5mm
RS Stock No. 855-3381
Mfr. Part No.2727365
TWD8,695.00
Each
units
IB IL 400 MLR 1-8A 2 - - Motor - - - 187 → 600 V ac - - 224mm 63mm 109mm