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. 528-0627
Mfr. Part No.2832849
MYR1,961.05
Each
units
FL SWITCH SF 16TX - - - - - - - 24 V dc - - 94.3mm 205mm 30mm
RS Stock No. 528-0633
Mfr. Part No.2832771
MYR893.31
Each
units
FL SWITCH SF 8TX 8 - - - - - - 24 V dc - - 94.3mm 135mm 30mm
RS Stock No. 901-0826
Mfr. Part No.2903805
MYR2,621.89
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. 901-0817
Mfr. Part No.2903806
MYR2,066.30
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. 855-3486
Mfr. Part No.2861768
MYR2,318.19
Each
units
IB IL IMPULSE-IN-PAC - - - - - - - - - - 135mm 12.2mm 71.5mm
RS Stock No. 893-7846
Mfr. Part No.2701954
MYR7,223.49
Each
units
IB STME 24 AO 4/EF - 4 - Analogue - 4 - 0 → 10 V dc, -10 → 10 V dc 0 → 20 mA, 4 → 20 mA Analogue Output 118mm 116mm 117mm
RS Stock No. 528-0649
Mfr. Part No.2832933
MYR3,171.09
Each
units
FL SWITCH SF 6TX/2FX 6 - - - - - - 24 V dc - - 115.3mm 135mm 30mm
RS Stock No. 124-3349
Mfr. Part No.2906595
MYR847.60
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. 696-2119
Mfr. Part No.2313452
MYR2,754.45
Each
units
FL COMSERVER UNI 232/422/485 - - - - - - - 28 V dc, 240 V ac - - 86mm 12.3mm 96mm
RS Stock No. 528-0453
Mfr. Part No.2862343
MYR3,008.08
Each
units
ILB IB 24 DI32 32 - Digital - INTERBUS 32 - 24 V dc - - 140.5mm 156mm 57mm
RS Stock No. 696-2121
Mfr. Part No.2313436
MYR1,363.44
Each
units
PSI-MODEM-BASIC/USB - - - - - - - 28 V dc, 240 V ac - - 86mm 12.3mm 96mm
New
RS Stock No. 190-2097
Mfr. Part No.2703994
MYR2,679.04
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. 855-1430
Mfr. Part No.2878722
MYR2,171.10
Each
units
IB IL RS 232-PRO-PAC - - - - - - - 19.2 → 30 V dc - - 136mm 24.4mm 71.5mm
RS Stock No. 855-3357
Mfr. Part No.2701217
MYR2,363.86
Each
units
IB IL TEMP 2 RTD-XC-PAC 2 - Analogue - - - - 24 V dc - - - - -
RS Stock No. 893-7837
Mfr. Part No.2700838
MYR7,502.42
Each
units
IB ST 24 AI 4/EF 4 - Analogue Voltage - ST Station 4 - 0 → 10 V dc, -10 → 10 V dc - Analogue Input 118mm 116mm 117mm
RS Stock No. 855-1382
Mfr. Part No.2862990
MYR159.77
Each
units
IB IL PD GND-PAC - - - - - - - - - - 119.8mm 12.2mm 71.5mm
RS Stock No. 855-1461
Mfr. Part No.2897813
MYR3,139.95
Each
units
IB IL DALI/PWR-PAC - - - - - - - - - - 119.8mm 48.8mm 71.5mm
RS Stock No. 855-3460
Mfr. Part No.2861535
MYR319.58
Each
units
IB IL 230 PWR IN-PAC - - - - - - - 207 → 253 V ac - - 119.8mm 36.6mm 71.5mm
RS Stock No. 124-3354
Mfr. Part No.2906603
MYR127.60
Each
units
IOA REL 24V DI/BFI/1.0A/EX 1 (Digital) - Digital Relay - Field Devices 1 (Input) - - - I/O Module 10.3mm 64.2mm 72.9mm
RS Stock No. 528-0582
Mfr. Part No.2863562
MYR3,150.12
Each
units
ILB PB 24 DI 8 DIO8 8 8 Digital Digital Profibus Series 16 - 24 V dc 500 mA - 141.1mm 95mm 57mm