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. 735-2904
Mfr. Part No.6ES7241-1CH30-1XB0
BrandSiemens
$216.99
Each
units
S7-1200 - - - - S7-1200 Series - - - - - 62mm 38mm 21mm
RS Stock No. 787-7973
Mfr. Part No.6ES7232-4HB32-0XB0
BrandSiemens
$578.54
Each
units
SM 1232 - 2 - Analogue SIMATIC S7-1200 Series - - 24 V dc 0 → 20 mA - 100mm 45mm 75mm
RS Stock No. 614-0687
Mfr. Part No.6GK5101-1BB00-2AA3
BrandSiemens
$864.33
Each
units
6GK5 101 - - - - - - Ethernet 24 V dc - Ethernet Communications Module 125mm 40mm 124mm
RS Stock No. 735-2884
Mfr. Part No.6ES7231-4HA30-0XB0
BrandSiemens
$132.90
Each
units
SIMATIC S7-1200 1 - Analogue, Differential - SIMATIC S7-1200 Series 1 - 5 V dc - - 62mm 38mm 21mm
RS Stock No. 828-5252
Mfr. Part No.6ES7231-4HD32-0XB0
BrandSiemens
$442.12
Each
units
6ES7231 4 - Analogue - SIMATIC S7-1200 4 - 24 V dc - - 100mm 45mm 75mm
RS Stock No. 662-3542
Mfr. Part No.6ES7132-4FB01-0AB0
BrandSiemens
$473.58
Each
units
SIMATIC ET 200S - 2 - Digital SIMATIC ET 200S Series 2 - 24 → 230 V ac 2 A - 81mm 15mm 52mm
RS Stock No. 614-0564
Mfr. Part No.6GK5208-0HA00-2AA6
BrandSiemens
$2,152.11
Each
units
6GK5 208 - - - - - 11 - 24 V dc - - 125mm 90mm 124mm
RS Stock No. 746-6602
Mfr. Part No.6ES7323-1BH01-0AA0
BrandSiemens
$622.04
Each
units
- 8 8 Digital Digital S7-300 Series - - 24 V dc - - 125mm 40mm 120mm
RS Stock No. 787-7986
Mfr. Part No.6ES7234-4HE32-0XB0
BrandSiemens
$736.95
Each
units
SM 1234 4 2 Analogue Analogue SIMATIC S7-1200 Series 6 - 24 V dc 0 → 20 mA - 100mm 45mm 75mm
RS Stock No. 787-7945
Mfr. Part No.6ES7221-1BH32-0XB0
BrandSiemens
$421.89
Each
units
SM 1221 16 - Digital - SIMATIC S7-1200 Series - - 24 V dc - - 100mm 45mm 75mm
RS Stock No. 787-7977
Mfr. Part No.6ES7232-4HD32-0XB0
BrandSiemens
$716.12
Each
units
SM 1232 - 4 Analogue Analogue SIMATIC S7-1200 Series - - 24 V dc 0 → 20 mA - 100mm 45mm 75mm
RS Stock No. 662-3606
Mfr. Part No.6ES7151-1CA00-3BL0
BrandSiemens
$1,300.52
Each
units
SIMATIC ET 200S 16 16 Digital Digital SIMATIC ET 200S Series 32 - 24 V dc 500 mA - 81mm 120mm 58mm
RS Stock No. 662-3583
Mfr. Part No.6ES7135-4FB01-0AB0
BrandSiemens
$323.98
Each
units
SIMATIC ET 200S - 2 - Analogue SIMATIC ET 200S Series 2 - 24 V dc 25 mA - 81mm 15mm 52mm
RS Stock No. 746-5776
Mfr. Part No.6ES7223-3AD30-0XB0
BrandSiemens
$149.97
Each
units
6AG1 Series 2 - Digital Digital S7-1200 Series 2 - 5 V dc - - 62mm 38mm 21mm
RS Stock No. 735-2901
Mfr. Part No.6GK7242-5DX30-0XE0
BrandSiemens
$760.54
Each
units
S7-1200 - - - - S7-1200 Series - - - - - - - -
RS Stock No. 787-7967
Mfr. Part No.6ES7223-1BL32-0XB0
BrandSiemens
$664.82
Each
units
SM 1223 16 16 Digital Digital SIMATIC S7-1200 Series 32 - 24 V dc 500 mA - 100mm 70mm 75mm
RS Stock No. 662-3167
Mfr. Part No.6ES7131-4BD01-0AA0
BrandSiemens
$73.36
Each
units
SIMATIC ET 200S 4 - Digital - SIMATIC ET 200S Series 4 - 24 V dc - - 81mm 15mm 52mm
RS Stock No. 787-7961
Mfr. Part No.6ES7223-1PL32-0XB0
BrandSiemens
$595.71
Each
units
SM 1223 16 16 Digital Relay SIMATIC S7-1200 Series 32 - 24 V dc 2 A - 100mm 70mm 75mm
RS Stock No. 735-2890
Mfr. Part No.6ES7231-5QA30-0XB0
BrandSiemens
$221.26
Each
units
SIMATIC S7-1200 1 - Analogue - SIMATIC S7-1200 Series 1 - 5 V dc - - 62mm 38mm 21mm
RS Stock No. 612-9084
Mfr. Part No.6ES7334-0CE01-0AA0
BrandSiemens
$1,203.60
Each
units
SIMATIC S7-300 Series 4 2 Analogue Analogue SIMATIC S7-300 Series 6 - 24 V dc - - 125mm 40mm 120mm