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. 787-7961
Mfr. Part No.6ES7223-1PL32-0XB0
BrandSiemens
SGD538.45
Each
units
SM 1223 16 16 Digital Relay SIMATIC S7-1200 Series 32 - 24 V dc 2 A - 100mm 70mm 75mm
RS Stock No. 787-7942
Mfr. Part No.6ES7221-1BF32-0XB0
BrandSiemens
SGD175.57
Each
units
SM 1221 8 - Digital Digital SIMATIC S7-1200 Series - - 24 V dc - - 100mm 45mm 75mm
RS Stock No. 147-641
Mfr. Part No.BMXDDO1602
SGD294.57
Each
units
M340 - 16 - Discrete, Transistor M340 Series 16 - 24 V dc - - - - -
RS Stock No. 146-002
Mfr. Part No.GRT1-DA2V
BrandOmron
SGD415.41
Each
units
GRT1 Series - 2 - Analogue - 2 - - - - - - -
RS Stock No. 455-6939
Mfr. Part No.QY10
BrandMitsubishi
SGD331.65
Each
units
MELSEC Q - 16 - Digital, Relay MELSEC Q Series 16 - 24 V dc, 250 V ac - - 98mm 27.4mm 90mm
RS Stock No. 453-2517
Mfr. Part No.6ES7321-1BH02-0AA0
BrandSiemens
SGD350.68
Each
units
SIMATIC S7-300 Series 16 - Digital - SIMATIC S7-300 Series 16 - 20.4 → 28.8 V dc - - 125mm 40mm 120mm
RS Stock No. 705-4928
Mfr. Part No.FX3U-4DA
BrandMitsubishi
SGD850.66
Each
units
MELSEC FX - 4 - Analogue MELSEC FX Series 4 - 5 V dc, 24 V dc 0 → 20 mA - 90mm 55mm 87mm
RS Stock No. 662-3520
Mfr. Part No.6ES7193-4CA20-0AA0
BrandSiemens
SGD17.13
Each
units
ET200S - - - - ET200S Series - - - - Terminal Module - - -
RS Stock No. 705-4925
Mfr. Part No.FX3U-4AD
BrandMitsubishi
SGD523.02
Each
units
MELSEC FX 4 - Analogue - MELSEC FX Series 4 - 5 V dc, 24 V dc - - 90mm 55mm 87mm
RS Stock No. 787-7955
Mfr. Part No.6ES7222-1HH32-0XB0
BrandSiemens
SGD332.65
Each
units
SM 1222 - 16 Digital Digital SIMATIC S7-1200 Series - - 24 V dc 2 A - 100mm 45mm 75mm
RS Stock No. 735-2890
Mfr. Part No.6ES7231-5QA30-0XB0
BrandSiemens
SGD185.69
Each
units
SIMATIC S7-1200 1 - Analogue - SIMATIC S7-1200 Series 1 - 5 V dc - - 62mm 38mm 21mm
RS Stock No. 662-3589
Mfr. Part No.6ES7134-4FB01-0AB0
BrandSiemens
SGD275.48
Each
units
SIMATIC ET 200S 2 - Analogue - SIMATIC ET 200S Series 2 - 24 V dc - - 81mm 15mm 52mm
RS Stock No. 667-9223
Mfr. Part No.750-404
BrandWago
SGD380.40
Each
units
750 1 2 Current Digital 750 Series 1/2 - 24 V dc 500 mA - - 12mm -
RS Stock No. 320-9137
Mfr. Part No.FX2N-32ER-ES/UL
BrandMitsubishi
SGD623.21
Each
units
FX2N Series 16 16 - - FX2N Series - - 100 → 240 V ac - I/O Module 90mm 150mm 87mm
RS Stock No. 510-1495
Mfr. Part No.CJ1WOD211
BrandOmron
SGD399.78
Each
units
SYSMAC CJ Series - 16 - Digital, Transistor SYSMAC CJ Series 16 - 12 → 24 V dc 500 mA - 89mm 31mm 95.4mm
RS Stock No. 253-2335
Mfr. Part No.TSXDMZ28DR
SGD931.81
Each
units
Modicon TSX Micro 16 12 Discrete Discrete Modicon TSX 28 - 100 → 120 V ac - - - - -
RS Stock No. 735-2910
Mfr. Part No.6GK7243-5DX30-0XE0
BrandSiemens
SGD942.43
Each
units
S7-1200 - - - - S7-1200 Series - - - - - 100mm 30mm 75mm
RS Stock No. 746-6722
Mfr. Part No.6ES7361-3CA01-0AA0
BrandSiemens
SGD455.90
Each
units
6ES7 Series - - - - S7-300 Series - - 24 V dc - - 125mm 80mm 120mm
RS Stock No. 148-206
Mfr. Part No.BMXDDI3202K
SGD484.94
Each
units
M340 32 - Discrete - M340 Series 32 - 24 V dc - - - - -
RS Stock No. 674-1943
Mfr. Part No.TM2DDI16DT
SGD292.94
Each
units
Twido Series 16 - Digital - Twido Series - - 24 V dc - Input Module 90mm 24mm 70mm
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