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. 612-9084
Mfr. Part No.6ES7334-0CE01-0AA0
BrandSiemens
HK$4,256.91
Each
units
SIMATIC S7-300 Series 4 2 Analogue Analogue SIMATIC S7-300 Series 6 - 24 V dc - - 125mm 40mm 120mm
RS Stock No. 453-2624
Mfr. Part No.6ES7322-1BL00-0AA0
BrandSiemens
HK$4,552.60
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. 453-2517
Mfr. Part No.6ES7321-1BH02-0AA0
BrandSiemens
HK$1,689.27
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. 453-2618
Mfr. Part No.6ES7321-1BL00-0AA0
BrandSiemens
HK$3,429.90
Each
units
SIMATIC S7-300 Series 32 - Digital - S7-300 Series 32 - 20.4 → 28.8 V dc - - 125mm 40mm 120mm
RS Stock No. 746-6722
Mfr. Part No.6ES7361-3CA01-0AA0
BrandSiemens
HK$3,853.20
Each
units
6ES7 Series - - - - S7-300 Series - - 24 V dc - - 125mm 80mm 120mm
RS Stock No. 612-9078
Mfr. Part No.6ES7331-7HF01-0AB0
BrandSiemens
HK$8,022.00
Each
units
SIMATIC S7-300 Series 8 - Analogue - SIMATIC S7-300 Series 8 - 24 V dc - - 125mm 40mm 120mm
RS Stock No. 453-2539
Mfr. Part No.6ES7322-1BH01-0AA0
BrandSiemens
HK$2,210.00
Each
units
SIMATIC S7-300 Series - 16 - Digital SIMATIC S7-300 Series 16 - 20.4 → 28.8 V dc 4 A - 125mm 40mm 120mm
RS Stock No. 434-1866
Mfr. Part No.6ES7277-0AA22-0XA0
BrandSiemens
HK$5,009.01
Each
units
SIMATIC S7-200 Series - - - - S7-200 Series - - 24 V dc - Slave Module - - -
RS Stock No. 453-2630
Mfr. Part No.6ES7322-1HH01-0AA0
BrandSiemens
HK$3,480.92
Each
units
SIMATIC S7-300 Series - 16 - Digital, Relay S7-300 Series - - 24 V dc, 24 → 240 V ac 2 A - 125mm 40mm 120mm
RS Stock No. 746-6621
Mfr. Part No.6ES7331-7KB02-0AB0
BrandSiemens
HK$3,720.00
Each
units
- 2 - Analogue - SIMATIC S7-300 Series - - - - Input 125mm 40mm 120mm
RS Stock No. 828-5265
Mfr. Part No.6GK5308-2FL10-2AA3
BrandSiemens
HK$23,198.08
Each
units
6GK5308 - - Current, Voltage Current, Voltage - - - 24 V dc 100 mA - 125mm 120mm 123mm
RS Stock No. 787-7986
Mfr. Part No.6ES7234-4HE32-0XB0
BrandSiemens
HK$2,897.74
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. 746-5785
Mfr. Part No.6ES7223-3BD30-0XB0
BrandSiemens
HK$614.28
Each
units
6AG1 Series 2 2 Digital Digital S7-1200 Series 4 - 24 V dc 100 mA - 62mm 38mm 21mm
RS Stock No. 787-7961
Mfr. Part No.6ES7223-1PL32-0XB0
BrandSiemens
HK$3,180.19
Each
units
SM 1223 16 16 Digital Relay SIMATIC S7-1200 Series 32 - 24 V dc 2 A - 100mm 70mm 75mm
RS Stock No. 662-3167
Mfr. Part No.6ES7131-4BD01-0AA0
BrandSiemens
HK$307.41
Each
units
SIMATIC ET 200S 4 - Digital - SIMATIC ET 200S Series 4 - 24 V dc - - 81mm 15mm 52mm
RS Stock No. 662-3595
Mfr. Part No.6ES7134-4GB01-0AB0
BrandSiemens
HK$1,384.32
Each
units
SIMATIC ET 200S 2 - Analogue - SIMATIC ET 200S Series 2 - 24 V dc - - 81mm 15mm 52mm
RS Stock No. 453-2646
Mfr. Part No.6ES7322-5HF00-0AB0
BrandSiemens
HK$2,366.77
Each
units
SIMATIC S7-300 Series - 8 - Digital, Relay S7-300 Series 8 - 24 V dc, 24 → 240 V ac 5 A - 125mm 40mm 120mm
RS Stock No. 662-3494
Mfr. Part No.6ES7132-4BD02-0AA0
BrandSiemens
HK$418.59
Each
units
SIMATIC ET 200S - 4 - Digital SIMATIC ET 200S Series 4 - 24 V dc 500 mA - 81mm 15mm 52mm
RS Stock No. 746-6713
Mfr. Part No.6ES7360-3AA01-0AA0
BrandSiemens
HK$3,359.20
Each
units
6ES7 Series - - - - S7-300 Series - - - - - - - -
RS Stock No. 453-2551
Mfr. Part No.6ES7332-5HD01-0AB0
BrandSiemens
HK$5,395.43
Each
units
SIMATIC S7-300 Series - 4 - Analogue SIMATIC S7-300 Series 4 - 24 V dc - - 125mm 40mm 120mm