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. 662-3549
Mfr. Part No.6ES7132-4HB01-0AB0
BrandSiemens
SGD72.07
Each
units
SIMATIC ET 200S - 2 - Digital SIMATIC ET 200S Series 2 - 24 → 120 V dc, 24 → 230 V ac 5 A - 81mm 15mm 52mm
RS Stock No. 787-7945
Mfr. Part No.6ES7221-1BH32-0XB0
BrandSiemens
SGD327.93
Each
units
SM 1221 16 - Digital - SIMATIC S7-1200 Series - - 24 V dc - - 100mm 45mm 75mm
RS Stock No. 787-8018
Mfr. Part No.6ES7223-1PH32-0XB0
BrandSiemens
SGD294.52
Each
units
SM 1223 8 8 Digital Digital SIMATIC S7-1200 Series 16 - 24 V dc 2 A - 100mm 45mm 75mm
RS Stock No. 901-0826
Mfr. Part No.2903805
SGD1,301.63
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. 787-7958
Mfr. Part No.6ES7222-1BH32-0XB0
BrandSiemens
SGD285.72
Each
units
SM 1222 - 16 Digital Digital SIMATIC S7-1200 Series - - 24 V dc 500 mA - 100mm 45mm 75mm
RS Stock No. 320-9109
Mfr. Part No.FX2N-16EX-ES/UL
BrandMitsubishi
SGD338.44
Each
units
FX2N Series 16 - Digital - FX2N Series - - 24 V dc - Input Module 90mm 40mm 87mm
RS Stock No. 612-9078
Mfr. Part No.6ES7331-7HF01-0AB0
BrandSiemens
SGD1,423.96
Each
units
SIMATIC S7-300 Series 8 - Analogue - SIMATIC S7-300 Series 8 - 24 V dc - - 125mm 40mm 120mm
RS Stock No. 735-2904
Mfr. Part No.6ES7241-1CH30-1XB0
BrandSiemens
SGD166.18
Each
units
S7-1200 - - - - S7-1200 Series - - - - - 62mm 38mm 21mm
RS Stock No. 746-6621
Mfr. Part No.6ES7331-7KB02-0AB0
BrandSiemens
SGD421.63
Each
units
- 2 - Analogue - SIMATIC S7-300 Series - - - - Input 125mm 40mm 120mm
RS Stock No. 453-2624
Mfr. Part No.6ES7322-1BL00-0AA0
BrandSiemens
SGD1,294.71
Each
units
SIMATIC S7-300 Series - 32 - Digital S7-300 Series 32 - 20.4 → 28.8 V dc 500 mA - 125mm 40mm 120mm
RS Stock No. 455-6822
Mfr. Part No.QX80
BrandMitsubishi
SGD281.30
Each
units
MELSEC Q 16 - Digital - MELSEC Q Series 16 - 24 V dc - - 98mm 27.4mm 90mm
RS Stock No. 667-9251
Mfr. Part No.750-530
BrandWago
SGD144.91
Each
units
I/O SYSTEM 750 - 8 (Channel) - Digital 750 Series - - 24 V dc - Output Module 100mm 12mm 64mm
RS Stock No. 801-5766
Mfr. Part No.2700973
SGD665.43
Each
units
ILC 131 ETH - - - - - - - - - - - - -
RS Stock No. 662-3517
Mfr. Part No.6ES7132-4BB01-0AB0
BrandSiemens
SGD202.09
Each
units
SIMATIC ET 200S - 2 - Digital SIMATIC ET 200S Series 2 - 24 V dc 500 mA - 81mm 15mm 52mm
RS Stock No. 615-2371
Mfr. Part No.SR2MOD02
SGD869.72
Each
units
- - - - - - - - 12 → 24 V dc - GSM modem 73mm 54.5mm 39.5mm
RS Stock No. 453-2618
Mfr. Part No.6ES7321-1BL00-0AA0
BrandSiemens
SGD709.38
Each
units
SIMATIC S7-300 Series 32 - Digital - S7-300 Series 32 - 20.4 → 28.8 V dc - - 125mm 40mm 120mm
RS Stock No. 512-5889
Mfr. Part No.CJ1WID211
BrandOmron
SGD541.95
Each
units
SYSMAC CJ Series 16 - Digital - SYSMAC CJ Series 16 - 20.4 → 26.4 V dc 3 mA - 89mm 31mm 95.4mm
RS Stock No. 512-5902
Mfr. Part No.CJ1W-OD212
BrandOmron
SGD578.91
Each
units
SYSMAC CJ Series - 16 - Digital, Transistor SYSMAC CJ Series 16 - 24 V dc 500 mA - 89mm 31mm 95.4mm
RS Stock No. 662-3595
Mfr. Part No.6ES7134-4GB01-0AB0
BrandSiemens
SGD283.53
Each
units
SIMATIC ET 200S 2 - Analogue - SIMATIC ET 200S Series 2 - 24 V dc - - 81mm 15mm 52mm
RS Stock No. 901-0817
Mfr. Part No.2903806
SGD959.96
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
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