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
MYR3,786.34
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. 662-3592
Mfr. Part No.6ES7132-4BF00-0AA0
BrandSiemens
MYR383.21
Each
units
SIMATIC ET 200S - 8 - Digital SIMATIC ET 200S Series 8 - 24 V dc 500 mA - 81mm 15mm 52mm
RS Stock No. 512-5889
Mfr. Part No.CJ1WID211
BrandOmron
MYR1,148.55
Each
units
SYSMAC CJ Series 16 - Digital - SYSMAC CJ Series 16 - 20.4 → 26.4 V dc 3 mA - 89mm 31mm 95.4mm
RS Stock No. 787-7961
Mfr. Part No.6ES7223-1PL32-0XB0
BrandSiemens
MYR1,609.67
Each
units
SM 1223 16 16 Digital Relay SIMATIC S7-1200 Series 32 - 24 V dc 2 A - 100mm 70mm 75mm
RS Stock No. 868-7374
Mfr. Part No.750-517
BrandWago
MYR505.45
Each
units
750 - 2 Digital Relay - 2 (Output) - - 1 A @ 250 V ac, 1 A @ 40 V dc - 64mm 12mm 100mm
RS Stock No. 508-3915
Mfr. Part No.750513
BrandWago
MYR509.47
Each
units
I/O SYSTEM 750 - 2 (Channel) - Digital, Relay 750 Series - - 230 V dc - Output Module 100mm 12mm 64mm
RS Stock No. 815-5552
Mfr. Part No.FP2-X64D2
BrandPanasonic
MYR1,874.56
Each
units
FP2 Series 64 - DC - FP2 Series - - 24 V dc - - - - -
RS Stock No. 787-7945
Mfr. Part No.6ES7221-1BH32-0XB0
BrandSiemens
MYR946.83
Each
units
SM 1221 16 - Digital - SIMATIC S7-1200 Series - - 24 V dc - - 100mm 45mm 75mm
RS Stock No. 787-7942
Mfr. Part No.6ES7221-1BF32-0XB0
BrandSiemens
MYR540.65
Each
units
SM 1221 8 - Digital Digital SIMATIC S7-1200 Series - - 24 V dc - - 100mm 45mm 75mm
RS Stock No. 888-7849
Mfr. Part No.G4IDC5
BrandOpto 22
MYR78.89
Each
units
G4 - - Digital DC Voltage Digital - - - 10 → 32 V dc, 12 → 32 V ac 50 (Sinking) mA Digital DC Input 48.8mm 12.2mm 41.1mm
RS Stock No. 453-2539
Mfr. Part No.6ES7322-1BH01-0AA0
BrandSiemens
MYR1,631.16
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. 320-9121
Mfr. Part No.FX2N-16EYR-ES/UL
BrandMitsubishi
MYR1,347.40
Each
units
FX2N Series - 16 - Relay FX2N Series - - 24 V dc - Output Module 90mm 40mm 87mm
RS Stock No. 453-2618
Mfr. Part No.6ES7321-1BL00-0AA0
BrandSiemens
MYR2,581.90
Each
units
SIMATIC S7-300 Series 32 - Digital - S7-300 Series 32 - 20.4 → 28.8 V dc - - 125mm 40mm 120mm
RS Stock No. 746-6606
Mfr. Part No.6ES7323-1BL00-0AA0
BrandSiemens
MYR3,053.38
Each
units
- 16 16 Digital Digital S7-300 Series - - 24 V dc - - 125mm 40mm 120mm
RS Stock No. 662-3561
Mfr. Part No.6ES7138-4CA01-0AA0
BrandSiemens
MYR104.77
Each
units
ET200S - - - Current, Potential, Voltage ET200S Series - - 24 V dc - Power Module 81mm 15mm 52mm
RS Stock No. 662-3491
Mfr. Part No.6ES7132-4BD32-0AA0
BrandSiemens
MYR485.58
Each
units
SIMATIC ET 200S - 4 - Digital SIMATIC ET 200S Series 4 - 24 V dc 2 A - 81mm 15mm 52mm
RS Stock No. 508-3959
Mfr. Part No.750600
BrandWago
MYR95.80
Each
units
I/O SYSTEM 750 - - - - 750 Series - - - - End Module 100mm 12mm 64mm
RS Stock No. 662-3586
Mfr. Part No.6ES7134-4GB11-0AB0
BrandSiemens
MYR957.13
Each
units
SIMATIC ET 200S 2 - Analogue - SIMATIC ET 200S Series 2 - 24 V dc - - 81mm 15mm 52mm
RS Stock No. 735-2904
Mfr. Part No.6ES7241-1CH30-1XB0
BrandSiemens
MYR409.60
Each
units
S7-1200 - - - - S7-1200 Series - - - - - 62mm 38mm 21mm
RS Stock No. 888-7852
Mfr. Part No.G4IDC5K
BrandOpto 22
MYR115.53
Each
units
G4 - - Digital DC Voltage Digital - - - 2.5 → 16 V dc 50 (Sinking) mA Digital DC Input 48.8mm 12.2mm 41.1mm
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