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
$895.53
Each
units
SIMATIC S7-300 Series 4 2 Analogue Analogue SIMATIC S7-300 Series 6 - 24 V dc - - 125mm 40mm 120mm
RS Stock No. 148-082
Mfr. Part No.BMXDDO3202K
$1,030.40
Each
units
M340 - 32 - Discrete, Transistor M340 Series 32 - 24 V dc - - - - -
RS Stock No. 148-054
Mfr. Part No.BMXDDI6402K
$1,186.40
Each
units
M340 64 - Discrete - M340 Series 64 - 24 V dc - - - - -
RS Stock No. 662-3586
Mfr. Part No.6ES7134-4GB11-0AB0
BrandSiemens
$308.65
Each
units
SIMATIC ET 200S 2 - Analogue - SIMATIC ET 200S Series 2 - 24 V dc - - 81mm 15mm 52mm
RS Stock No. 787-7986
Mfr. Part No.6ES7234-4HE32-0XB0
BrandSiemens
$673.88
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. 512-5902
Mfr. Part No.CJ1W-OD212
BrandOmron
$596.10
Each
units
SYSMAC CJ Series - 16 - Digital, Transistor SYSMAC CJ Series 16 - 24 V dc 500 mA - 89mm 31mm 95.4mm
RS Stock No. 539-0960
Mfr. Part No.FX3U-ENET
BrandMitsubishi
$949.52
Each
units
FX3U Series - - - - FX3U Series 8 - 24 V dc - Ethernet Communications Module 90mm 55mm 87mm
RS Stock No. 488-6151
Mfr. Part No.6ES7291-8GF23-0XA0
BrandSiemens
$212.42
Each
units
- - - - - S7-200 Series - - - - Memory Module - - -
RS Stock No. 662-3539
Mfr. Part No.6ES7138-4AA01-0AA0
BrandSiemens
$32.91
Each
units
ET200S - - - - ET200S Series - - 24 V dc - Reserve Module 15mm 81mm 52mm
RS Stock No. 662-3549
Mfr. Part No.6ES7132-4HB01-0AB0
BrandSiemens
$81.73
Each
units
SIMATIC ET 200S - 2 - Digital SIMATIC ET 200S Series 2 - 24 → 120 V dc, 24 → 230 V ac 5 A - 81mm 15mm 52mm
RS Stock No. 746-6713
Mfr. Part No.6ES7360-3AA01-0AA0
BrandSiemens
$447.77
Each
units
6ES7 Series - - - - S7-300 Series - - - - - - - -
RS Stock No. 453-2630
Mfr. Part No.6ES7322-1HH01-0AA0
BrandSiemens
$772.70
Each
units
SIMATIC S7-300 Series - 16 - Digital, Relay S7-300 Series - - 24 → 240 V ac, 24 V dc 2 A - 125mm 40mm 120mm
RS Stock No. 512-5930
Mfr. Part No.CJ1W-SCU41
BrandOmron
$1,233.53
Each
units
CJ Series - - - - CJ Series - - - - - - - -
RS Stock No. 453-2624
Mfr. Part No.6ES7322-1BL00-0AA0
BrandSiemens
$1,054.21
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. 528-0453
Mfr. Part No.2862343
$906.58
Each
units
ILB IB 24 DI32 32 - Digital - INTERBUS 32 - 24 V dc - - 140.5mm 156mm 57mm
RS Stock No. 623-7680
Mfr. Part No.VBA-4E3A-KE-ZE/R
$249.00
Each
units
- 4 3 - - - 7 - 21 → 31 V dc - - 102mm 22.5mm 99mm
RS Stock No. 148-111
Mfr. Part No.BMXDRA0805
$312.48
Each
units
M340 - 8 - Discrete, Relay M340 Series 8 - 24 → 240 V ac, 24 V dc - - - - -
RS Stock No. 746-6606
Mfr. Part No.6ES7323-1BL00-0AA0
BrandSiemens
$984.65
Each
units
- 16 16 Digital Digital S7-300 Series - - 24 V dc - - 125mm 40mm 120mm
RS Stock No. 667-9217
Mfr. Part No.750-340
BrandWago
$946.32
Each
units
750 Series 32 32 Analogue, Digital Analogue, Digital 750 Series 64 - 24 V - - - - -
RS Stock No. 787-8018
Mfr. Part No.6ES7223-1PH32-0XB0
BrandSiemens
$395.53
Each
units
SM 1223 8 8 Digital Digital SIMATIC S7-1200 Series 16 - 24 V dc 2 A - 100mm 45mm 75mm
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