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. 787-7977
Mfr. Part No.6ES7232-4HD32-0XB0
BrandSiemens
$645.15
Each
units
SM 1232 - 4 Analogue Analogue SIMATIC S7-1200 Series - - 24 V dc 0 → 20 mA - 100mm 45mm 75mm
RS Stock No. 508-3943
Mfr. Part No.750461
BrandWago
$521.23
Each
units
I/O SYSTEM 750 2 (Channel) - Analogue - 750 Series - - - - Input Module 100mm 12mm 64mm
RS Stock No. 674-1968
Mfr. Part No.TM2DMM8DRT
$324.97
Each
units
Modicon M238, Twido Series 4 4 Digital Digital Modicon M238, Twido Series - - 24 V dc - I/O Module 90mm 24mm 70mm
RS Stock No. 674-1940
Mfr. Part No.TM2DDI8DT
$295.52
Each
units
Twido Series 8 - Digital - Twido Series - - 24 V dc - Input Module 90mm 24mm 70mm
RS Stock No. 893-0697
Mfr. Part No.1315620000
BrandWeidmuller
$402.63
Each
units
- 4 - Analogue Voltage - - 4 - -10 → 10 V, 0 → 10 V, 0 → 5 V, 1 → 5 V, 2 → 10 V - Analogue Input 120mm 11.5mm 76mm
RS Stock No. 787-7958
Mfr. Part No.6ES7222-1BH32-0XB0
BrandSiemens
$370.87
Each
units
SM 1222 - 16 Digital Digital SIMATIC S7-1200 Series - - 24 V dc 500 mA - 100mm 45mm 75mm
RS Stock No. 508-3937
Mfr. Part No.750554
BrandWago
$806.06
Each
units
I/O SYSTEM 750 - 2 (Channel) - Analogue 750 Series - - - - Output Module 100mm 12mm 64mm
RS Stock No. 806-7051
Mfr. Part No.TM3AM6G
$382.47
Each
units
TM3 Series 4 2 Current, Voltage Current, Voltage Modicon M221, Modicon M241, Modicon M251 6 - -10 → 10 V dc 0 → 20 mA - 90mm 23.6mm 70mm
RS Stock No. 148-098
Mfr. Part No.BMXDDO6402K
$1,460.74
Each
units
M340 - 64 - Discrete, Transistor M340 Series 64 - 24 V dc - - - - -
RS Stock No. 787-7967
Mfr. Part No.6ES7223-1BL32-0XB0
BrandSiemens
$598.94
Each
units
SM 1223 16 16 Digital Digital SIMATIC S7-1200 Series 32 - 24 V dc 500 mA - 100mm 70mm 75mm
RS Stock No. 746-6154
Mfr. Part No.6ES7151-8AB01-0AB0
BrandSiemens
$1,583.55
Each
units
6ES7 Series - - - - EM 200 Series - - 24 V dc - - 119.5mm 120mm 75mm
RS Stock No. 735-2901
Mfr. Part No.6GK7242-5DX30-0XE0
BrandSiemens
$685.17
Each
units
S7-1200 - - - - S7-1200 Series - - - - - - - -
RS Stock No. 787-7964
Mfr. Part No.6ES7223-1BH32-0XB0
BrandSiemens
$378.87
Each
units
SM 1223 8 8 Digital Digital SIMATIC S7-1200 Series 16 - 24 V dc 500 mA - 100mm 45mm 75mm
RS Stock No. 434-1759
Mfr. Part No.6ES72231BF220XA0
BrandSiemens
$468.15
Each
units
S7-200 Series 4 4 Digital Digital S7-200 Series - - 24 V dc - I/O Module - - -
RS Stock No. 612-9084
Mfr. Part No.6ES7334-0CE01-0AA0
BrandSiemens
$1,084.32
Each
units
SIMATIC S7-300 Series 4 2 Analogue Analogue SIMATIC S7-300 Series 6 - 24 V dc - - 125mm 40mm 120mm
RS Stock No. 674-1962
Mfr. Part No.TM2DRA16RT
$592.53
Each
units
Modicon M238, Twido Series - 16 - Digital Modicon M238, Twido Series - - 230 V ac - Output Module 90mm 24mm 70mm
RS Stock No. 510-1495
Mfr. Part No.CJ1WOD211
BrandOmron
$416.96
Each
units
SYSMAC CJ Series - 16 - Digital, Transistor SYSMAC CJ Series 16 - 12 → 24 V dc 500 mA - 89mm 31mm 95.4mm
RS Stock No. 787-7961
Mfr. Part No.6ES7223-1PL32-0XB0
BrandSiemens
$536.68
Each
units
SM 1223 16 16 Digital Relay SIMATIC S7-1200 Series 32 - 24 V dc 2 A - 100mm 70mm 75mm
RS Stock No. 148-082
Mfr. Part No.BMXDDO3202K
$575.46
Each
units
M340 - 32 - Discrete, Transistor M340 Series 32 - 24 V dc - - - - -
RS Stock No. 498-943
Mfr. Part No.3RK1205-0BQ00-0AA3
BrandSiemens
$230.14
Each
units
3RK1205 2 - Digital - - 2 - 26.5 → 31.6 V - - 80mm 45mm 34mm
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