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. 735-2904
Mfr. Part No.6ES7241-1CH30-1XB0
BrandSiemens
kr 785,64
Each
Units
S7-1200 - - - - S7-1200 Series - - - - - 62mm 38mm 21mm
RS Stock No. 667-9217
Mfr. Part No.750-340
BrandWago
kr 3 953,40
Each
Units
750 Series 32 32 Analogue, Digital Analogue, Digital 750 Series 64 - 24 V - - - - -
RS Stock No. 828-5252
Mfr. Part No.6ES7231-4HD32-0XB0
BrandSiemens
kr 2 128,60
Each
Units
6ES7231 4 - Analogue - SIMATIC S7-1200 4 - 24 V dc - - 100mm 45mm 75mm
RS Stock No. 901-0826
Mfr. Part No.2903805
kr 4 312,67
Each
Units
TC MOBILE I/O X200 2 4 Analogue, Digital Relay PSI Modem SMS Relay 6 - 0 60 V dc 6 A Analogue, Digital 71.6mm 62.2mm 89.7mm
RS Stock No. 787-7986
Mfr. Part No.6ES7234-4HE32-0XB0
BrandSiemens
kr 3 100,67
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. 888-7940
Mfr. Part No.G4ODC5
BrandOpto 22
kr 164,89
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. 320-9121
Mfr. Part No.FX2N-16EYR-ES/UL
BrandMitsubishi
kr 2 617,92
Each
Units
FX2N Series - 16 - Relay FX2N Series - - 24 V dc - Output Module 90mm 40mm 87mm
RS Stock No. 667-9236
Mfr. Part No.750-430
BrandWago
kr 580,81
Each
Units
I/O SYSTEM 750 8 (Channel) - Digital - 750 Series - - 24 V dc - Input Module 100mm 12mm 64mm
RS Stock No. 735-2910
Mfr. Part No.6GK7243-5DX30-0XE0
BrandSiemens
kr 4 187,40
Each
Units
S7-1200 - - - - S7-1200 Series - - - - - 100mm 30mm 75mm
RS Stock No. 735-2884
Mfr. Part No.6ES7231-4HA30-0XB0
BrandSiemens
kr 607,17
Each
Units
SIMATIC S7-1200 1 - Analogue, Differential - SIMATIC S7-1200 Series 1 - 5 V dc - - 62mm 38mm 21mm
RS Stock No. 787-7961
Mfr. Part No.6ES7223-1PL32-0XB0
BrandSiemens
kr 2 607,16
Each
Units
SM 1223 16 16 Digital Relay SIMATIC S7-1200 Series 32 - 24 V dc 2 A - 100mm 70mm 75mm
RS Stock No. 787-7970
Mfr. Part No.6ES7231-4HF32-0XB0
BrandSiemens
kr 3 459,59
Each
Units
SM 1231 8 - Analogue Analogue SIMATIC S7-1200 Series - - 24 V dc - - 100mm 45mm 75mm
RS Stock No. 735-2888
Mfr. Part No.6ES7231-5PA30-0XB0
BrandSiemens
kr 917,24
Each
Units
SIMATIC S7-1200 1 - Analogue, RTD - SIMATIC S7-1200 Series 1 - 5 V dc - - 62mm 38mm 21mm
RS Stock No. 528-0576
Mfr. Part No.2862385
kr 3 220,31
Each
Units
ILB IB 24 DI16 DO16 16 16 Digital Digital INTERBUS 32 - 24 V dc 500 mA - 140.5mm 156mm 57mm
RS Stock No. 810-4147
Mfr. Part No.6ES7231-5PD32-0XB0
BrandSiemens
kr 2 976,05
Each
Units
SM 1231 4 - Analogue - CPU 1211, CPU 1212, CPU 1214 4 - 24 V dc - - 100mm 45mm 75mm
RS Stock No. 719-1936
Mfr. Part No.750-1504
BrandWago
kr 1 253,13
Each
Units
I/O SYSTEM 750 - 16 (Channel) - Digital 750 Series - - 24 V dc - Output Module 67mm 12mm 100mm
RS Stock No. 787-7945
Mfr. Part No.6ES7221-1BH32-0XB0
BrandSiemens
kr 1 645,05
Each
Units
SM 1221 16 - Digital - SIMATIC S7-1200 Series - - 24 V dc - - 100mm 45mm 75mm
RS Stock No. 320-9115
Mfr. Part No.FX2N-16EYT-ESS/UL
BrandMitsubishi
kr 2 617,92
Each
Units
FX2N Series 16 16 Analogue Transistor FX2N Series - - 24 V dc - Output Module 90mm 40mm 87mm
RS Stock No. 508-3959
Mfr. Part No.750600
BrandWago
kr 142,87
Each
Units
I/O SYSTEM 750 - - - - 750 Series - - - - End Module 100mm 12mm 64mm
RS Stock No. 889-1025
Mfr. Part No.SNAP-ODC5-I
BrandOpto 22
kr 586,07
Each
Units
SNAP - 4 - Digital DC Voltage SNAP PAC System 4 - 5 60 V dc 3 A Digital DC Output 82.55mm 18.29mm 90.17mm
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