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. 148-004
Mfr. Part No.BMXAMO0210
SGD543.06
Each
units
M340 - 2 - Analogue M340 Series 2 - 24 V dc - - - - -
RS Stock No. 148-183
Mfr. Part No.BMXDDI1602
SGD370.29
Each
units
M340 16 - Discrete - M340 Series 16 - 24 V dc - - - - -
RS Stock No. 787-7986
Mfr. Part No.6ES7234-4HE32-0XB0
BrandSiemens
SGD604.59
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. 453-2539
Mfr. Part No.6ES7322-1BH01-0AA0
BrandSiemens
SGD484.94
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. 662-3561
Mfr. Part No.6ES7138-4CA01-0AA0
BrandSiemens
SGD29.95
Each
units
ET200S - - - Current, Potential, Voltage ET200S Series - - 24 V dc - Power Module 81mm 15mm 52mm
RS Stock No. 888-7940
Mfr. Part No.G4ODC5
BrandOpto 22
SGD25.63
Each
units
G4 - - DC Digital Digital DC Voltage - - - 5 → 60 V dc 3 A Digital DC Output 48.8mm 12.2mm 41.1mm
RS Stock No. 455-6838
Mfr. Part No.QY80
BrandMitsubishi
SGD331.65
Each
units
MELSEC Q - 16 - Transistor MELSEC Q Series - - 12 → 24 V dc - Output Module 98mm 27.4mm 90.17mm
RS Stock No. 512-5895
Mfr. Part No.CJ1W-OC211
BrandOmron
SGD507.19
Each
units
SYSMAC CJ Series - 16 - Digital, Relay SYSMAC CJ Series 16 - 24 V dc, 250 V ac 2 A - 89mm 31mm 95.4mm
RS Stock No. 492-963
Mfr. Part No.FX2N-2DA
BrandMitsubishi
SGD634.07
Each
units
FX1N Series, FX3G Series, FX3U Series - 2 - Analogue FX1N Series, FX3G Series, FX3U Series 2 - 5 V dc, 24 V dc 4 → 20 mA - 90mm 55mm 87mm
RS Stock No. 818-4241
Mfr. Part No.CJ1WMD232
BrandOmron
SGD626.42
Each
units
CJ1W-MD 16 16 Voltage Transistor CJ/NJ Controllers 16 (Input), 16 (Output) - 24 V dc 500 mA - 95.4mm 31mm 83.6mm
RS Stock No. 787-7967
Mfr. Part No.6ES7223-1BL32-0XB0
BrandSiemens
SGD437.80
Each
units
SM 1223 16 16 Digital Digital SIMATIC S7-1200 Series 32 - 24 V dc 500 mA - 100mm 70mm 75mm
RS Stock No. 320-9121
Mfr. Part No.FX2N-16EYR-ES/UL
BrandMitsubishi
SGD404.79
Each
units
FX2N Series - 16 - Relay FX2N Series - - 24 V dc - Output Module 90mm 40mm 87mm
RS Stock No. 818-4210
Mfr. Part No.C500CE241
BrandOmron
SGD36.23
Each
units
- - - - - Omron CJ1W-OC/OA/OD - - - - - - - -
RS Stock No. 815-5555
Mfr. Part No.FP2-Y64T
BrandPanasonic
SGD585.08
Each
units
FP2 Series - 64 - NPN FP2 Series - - 24 V dc 100 mA - - - -
RS Stock No. 467-838
Mfr. Part No.6GK5310-0BA00-2AA3
BrandSiemens
SGD3,338.84
Each
units
6GK5 310 - - - - - 14 - 24 V dc - - 125mm 120mm 123mm
RS Stock No. 855-3486
Mfr. Part No.2861768
SGD657.09
Each
units
IB IL IMPULSE-IN-PAC - - - - - - - - - - 135mm 12.2mm 71.5mm
RS Stock No. 623-7624
Mfr. Part No.VBG-PB-K20-DMD
SGD1,576.00
Each
units
- - - - - - - - - - - 120mm 75mm 76mm
RS Stock No. 539-0768
Mfr. Part No.FX3U-4AD-PT-ADP
BrandMitsubishi
SGD597.16
Each
units
MELSEC FX 4 (PT100) - Analogue Relay, Transistor MELSEC FX Series 4 - 5 → 24 V dc - - 90mm 17.6mm 89.5mm
RS Stock No. 453-2551
Mfr. Part No.6ES7332-5HD01-0AB0
BrandSiemens
SGD1,120.18
Each
units
SIMATIC S7-300 Series - 4 - Analogue SIMATIC S7-300 Series 4 - 24 V dc - - 125mm 40mm 120mm
RS Stock No. 787-7955
Mfr. Part No.6ES7222-1HH32-0XB0
BrandSiemens
SGD332.65
Each
units
SM 1222 - 16 Digital Digital SIMATIC S7-1200 Series - - 24 V dc 2 A - 100mm 45mm 75mm
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