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
kr 785,64
Each
Units
S7-1200 - - - - S7-1200 Series - - - - - 62mm 38mm 21mm
RS Stock No. 828-5252
Mfr. Part No.6ES7231-4HD32-0XB0
BrandSiemens
kr 2 128,60
Each
Units
6ES7231 4 - Analogue - SIMATIC S7-1200 4 - 24 V dc - - 100mm 45mm 75mm
RS Stock No. 787-7986
Mfr. Part No.6ES7234-4HE32-0XB0
BrandSiemens
kr 3 100,67
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. 735-2884
Mfr. Part No.6ES7231-4HA30-0XB0
BrandSiemens
kr 607,17
Each
Units
SIMATIC S7-1200 1 - Analogue, Differential - SIMATIC S7-1200 Series 1 - 5 V dc - - 62mm 38mm 21mm
RS Stock No. 787-7961
Mfr. Part No.6ES7223-1PL32-0XB0
BrandSiemens
kr 2 607,16
Each
Units
SM 1223 16 16 Digital Relay SIMATIC S7-1200 Series 32 - 24 V dc 2 A - 100mm 70mm 75mm
RS Stock No. 787-7970
Mfr. Part No.6ES7231-4HF32-0XB0
BrandSiemens
kr 3 459,59
Each
Units
SM 1231 8 - Analogue Analogue SIMATIC S7-1200 Series - - 24 V dc - - 100mm 45mm 75mm
RS Stock No. 735-2910
Mfr. Part No.6GK7243-5DX30-0XE0
BrandSiemens
kr 4 187,40
Each
Units
S7-1200 - - - - S7-1200 Series - - - - - 100mm 30mm 75mm
RS Stock No. 735-2888
Mfr. Part No.6ES7231-5PA30-0XB0
BrandSiemens
kr 917,24
Each
Units
SIMATIC S7-1200 1 - Analogue, RTD - SIMATIC S7-1200 Series 1 - 5 V dc - - 62mm 38mm 21mm
RS Stock No. 810-4147
Mfr. Part No.6ES7231-5PD32-0XB0
BrandSiemens
kr 2 976,05
Each
Units
SM 1231 4 - Analogue - CPU 1211, CPU 1212, CPU 1214 4 - 24 V dc - - 100mm 45mm 75mm
RS Stock No. 787-7945
Mfr. Part No.6ES7221-1BH32-0XB0
BrandSiemens
kr 1 645,05
Each
Units
SM 1221 16 - Digital - SIMATIC S7-1200 Series - - 24 V dc - - 100mm 45mm 75mm
RS Stock No. 746-6606
Mfr. Part No.6ES7323-1BL00-0AA0
BrandSiemens
kr 5 055,03
Each
Units
- 16 16 Digital Digital S7-300 Series - - 24 V dc - - 125mm 40mm 120mm
RS Stock No. 735-2901
Mfr. Part No.6GK7242-5DX30-0XE0
BrandSiemens
kr 2 941,15
Each
Units
S7-1200 - - - - S7-1200 Series - - - - - - - -
RS Stock No. 787-7949
Mfr. Part No.6ES7222-1BF32-0XB0
BrandSiemens
kr 1 036,88
Each
Units
SM 1222 - 8 Digital Digital SIMATIC S7-1200 Series - - 24 V dc 500 mA - 100mm 45mm 75mm
RS Stock No. 787-7977
Mfr. Part No.6ES7232-4HD32-0XB0
BrandSiemens
kr 3 589,20
Each
Units
SM 1232 - 4 Analogue Analogue SIMATIC S7-1200 Series - - 24 V dc 0 → 20 mA - 100mm 45mm 75mm
RS Stock No. 453-2551
Mfr. Part No.6ES7332-5HD01-0AB0
BrandSiemens
kr 5 997,13
Each
Units
SIMATIC S7-300 Series - 4 - Analogue SIMATIC S7-300 Series 4 - 24 V dc - - 125mm 40mm 120mm
RS Stock No. 787-8018
Mfr. Part No.6ES7223-1PH32-0XB0
BrandSiemens
kr 1 645,05
Each
Units
SM 1223 8 8 Digital Digital SIMATIC S7-1200 Series 16 - 24 V dc 2 A - 100mm 45mm 75mm
RS Stock No. 662-3520
Mfr. Part No.6ES7193-4CA20-0AA0
BrandSiemens
kr 83,15
Each
Units
ET200S - - - - ET200S Series - - - - Terminal Module - - -
RS Stock No. 787-7967
Mfr. Part No.6ES7223-1BL32-0XB0
BrandSiemens
kr 2 607,16
Each
Units
SM 1223 16 16 Digital Digital SIMATIC S7-1200 Series 32 - 24 V dc 500 mA - 100mm 70mm 75mm
RS Stock No. 662-3612
Mfr. Part No.6ES7151-1CA00-0AB0
BrandSiemens
kr 2 510,88
Each
Units
ET200S - - - - ET200S Series - - 24 V dc - Interface Module 119.5mm 45mm 75mm
RS Stock No. 810-4153
Mfr. Part No.6ES7231-5QD32-0XB0
BrandSiemens
kr 2 976,05
Each
Units
SM 1231 4 - Analogue - CPU 1211, CPU 1212, CPU 1214 4 - 24 V dc - - 100mm 45mm 75mm