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. 453-2624
Mfr. Part No.6ES7322-1BL00-0AA0
BrandSiemens
TWD20,821.00
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. 453-2551
Mfr. Part No.6ES7332-5HD01-0AB0
BrandSiemens
TWD23,998.00
Each
units
SIMATIC S7-300 Series - 4 - Analogue SIMATIC S7-300 Series 4 - 24 V dc - - 125mm 40mm 120mm
RS Stock No. 787-7977
Mfr. Part No.6ES7232-4HD32-0XB0
BrandSiemens
TWD12,857.00
Each
units
SM 1232 - 4 Analogue Analogue SIMATIC S7-1200 Series - - 24 V dc 0 → 20 mA - 100mm 45mm 75mm
RS Stock No. 453-2618
Mfr. Part No.6ES7321-1BL00-0AA0
BrandSiemens
TWD15,026.00
Each
units
SIMATIC S7-300 Series 32 - Digital - S7-300 Series 32 - 20.4 → 28.8 V dc - - 125mm 40mm 120mm
RS Stock No. 662-3561
Mfr. Part No.6ES7138-4CA01-0AA0
BrandSiemens
TWD644.00
Each
units
ET200S - - - Current, Potential, Voltage ET200S Series - - 24 V dc - Power Module 81mm 15mm 52mm
RS Stock No. 787-7986
Mfr. Part No.6ES7234-4HE32-0XB0
BrandSiemens
TWD11,098.00
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. 453-2646
Mfr. Part No.6ES7322-5HF00-0AB0
BrandSiemens
TWD10,252.00
Each
units
SIMATIC S7-300 Series - 8 - Digital, Relay S7-300 Series 8 - 24 240 V ac, 24 V dc 5 A - 125mm 40mm 120mm
RS Stock No. 746-6602
Mfr. Part No.6ES7323-1BH01-0AA0
BrandSiemens
TWD13,011.00
Each
units
- 8 8 Digital Digital S7-300 Series - - 24 V dc - - 125mm 40mm 120mm
RS Stock No. 810-4141
Mfr. Part No.6ES7231-5PF32-0XB0
BrandSiemens
TWD17,406.00
Each
units
SM 1231 8 - Analogue - CPU 1211, CPU 1212, CPU 1214 8 - 24 V dc - - 100mm 70mm 75mm
RS Stock No. 787-7964
Mfr. Part No.6ES7223-1BH32-0XB0
BrandSiemens
TWD7,126.00
Each
units
SM 1223 8 8 Digital Digital SIMATIC S7-1200 Series 16 - 24 V dc 500 mA - 100mm 45mm 75mm
RS Stock No. 662-3498
Mfr. Part No.6ES7131-4BD01-0AB0
BrandSiemens
TWD6,960.00
Each
units
SIMATIC ET 200S 4 - Digital - SIMATIC ET 200S Series 4 - 24 V dc 500 mA - 81mm 15mm 52mm
RS Stock No. 746-6589
Mfr. Part No.6ES7322-1FH00-0AA0
BrandSiemens
TWD18,205.00
Each
units
- - 16 - Digital S7-300 Series - - 120/230 V ac - Output 125mm 40mm 120mm
RS Stock No. 662-3678
Mfr. Part No.6ES7151-3AA23-0AB0
BrandSiemens
TWD11,892.00
Each
units
ET200S - - - - ET200S Series - - 24 V dc - Interface Module 119.5mm 60mm 75mm
RS Stock No. 662-3577
Mfr. Part No.6ES7131-4BF00-0AA0
BrandSiemens
TWD2,061.00
Each
units
SIMATIC ET 200S 8 - Digital - SIMATIC ET 200S Series 8 - 24 V dc - - 81mm 15mm 52mm
RS Stock No. 662-3167
Mfr. Part No.6ES7131-4BD01-0AA0
BrandSiemens
TWD4,754.00
Each
units
SIMATIC ET 200S 4 - Digital - SIMATIC ET 200S Series 4 - 24 V dc - - 81mm 15mm 52mm
RS Stock No. 612-9084
Mfr. Part No.6ES7334-0CE01-0AA0
BrandSiemens
TWD18,040.00
Each
units
SIMATIC S7-300 Series 4 2 Analogue Analogue SIMATIC S7-300 Series 6 - 24 V dc - - 125mm 40mm 120mm
RS Stock No. 787-7945
Mfr. Part No.6ES7221-1BH32-0XB0
BrandSiemens
TWD5,893.00
Each
units
SM 1221 16 - Digital - SIMATIC S7-1200 Series - - 24 V dc - - 100mm 45mm 75mm
RS Stock No. 662-3494
Mfr. Part No.6ES7132-4BD02-0AA0
BrandSiemens
TWD1,604.00
Each
units
SIMATIC ET 200S - 4 - Digital SIMATIC ET 200S Series 4 - 24 V dc 500 mA - 81mm 15mm 52mm
RS Stock No. 787-8018
Mfr. Part No.6ES7223-1PH32-0XB0
BrandSiemens
TWD5,893.00
Each
units
SM 1223 8 8 Digital Digital SIMATIC S7-1200 Series 16 - 24 V dc 2 A - 100mm 45mm 75mm
RS Stock No. 434-1850
Mfr. Part No.6ES7231-7PD22-0XA0
BrandSiemens
TWD28,342.00
Each
units
S7-200 4 - Analogue - S7-231 Series - - 24 V dc - Input Module 80mm 71.2mm 62mm