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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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Part Details Brand Stock Manufacturer Series Number of Inputs Number of Outputs Input Type Output Type For Use With Number of I/O Voltage Category Output Current Module Type Length Width Depth Dimensions Input Current Special Features Supply Voltage Application Maximum Operating Temperature Minimum Operating Temperature Mounting Type Connection to Host
Phoenix Contact PLC I/O Module 1 Inputs, 1 Outputs 1 A 12 → 48 V dc, 28 x 70 x 110 mm Phoenix Contact 0 - 1 1 - Digital Relay - - 12 → 48 V dc 1 A FO Converter 28mm 70mm 110mm 28 x 70 x 110 mm 100mA - 12 → 48 V dc - +75°C -40°C DIN Rail Terminal Block
Phoenix Contact PLC I/O Module 1 Inputs, 1 Outputs 500 mA 19.2 → 30.5 V dc, 17.5 x 99 x 114.5 mm Phoenix Contact 0 - 1 1 Analogue Digital - 32 19.2 → 30.5 V dc 500 mA Wireless Module 17.5mm 99mm 114.5mm 17.5 x 99 x 114.5 mm <lteq/>6A - 19.2 → 30.5 V dc - +70°C -40°C DIN Rail Terminal Block
Opto 22 G4 PLC I/O Module 3 A 5 → 60 V dc, 48.8 x 12.2 x 41.1 mm Opto 22 548 G4 - - DC Digital Digital DC Voltage - - 5 → 60 V dc 3 A Digital DC Output 48.8mm 12.2mm 41.1mm 48.8 x 12.2 x 41.1 mm 18mA - 24 V dc DC Relays, Indicators, Lamps, Motor Starters, Solenoids +70°C -30°C PCB Mount Circuit Board
Opto 22 G4 PLC I/O Module 50 (Sinking) mA 10 → 32 V dc, 12 → 32 V ac, 48.8 x 12.2 x 41.1 mm Opto 22 230 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 48.8 x 12.2 x 41.1 mm 25mA - 5 V dc Limit Switches, Photoelectronic Switches, Proximity Switches, Push Button, Selector Switches, TTL-Compatible Devices +70°C -30°C PCB Mount Circuit Board
Opto 22 G4 PLC I/O Module 3 A 5 → 60 V dc, 48.8 x 12.2 x 41.1 mm Opto 22 207 G4 - - DC Digital Digital DC Voltage - - 5 → 60 V dc 3 A Digital DC Output 48.8mm 12.2mm 41.1mm 48.8 x 12.2 x 41.1 mm 12mA - 5 V dc DC Relays, Indicators, Lamps, Motor Starters, Solenoids +70°C -30°C PCB Mount Circuit Board
Schneider Electric PM8000 PLC I/O Module 6 Inputs, 2 Outputs , 90.5 x 22 x 90.5 mm Schneider Electric 131 PM8000 6 2 Digital Relay - 8 - - Digital 90.5mm 22mm 90.5mm 90.5 x 22 x 90.5 mm - - - - +70°C -25°C DIN Rail -
Opto 22 G4 PLC I/O Module 1 Inputs, 1 Outputs 3 A 24 → 280 V ac, 48.8 x 12.2 x 41.1 mm Opto 22 78 G4 1 1 Digital Digital AC Voltage - - 24 → 280 V ac 3 A Digital AC Output 48.8mm 12.2mm 41.1mm 48.8 x 12.2 x 41.1 mm 12mA - 5 V dc AC Relays, Heaters, Indicators, Lamps, Motor Starters, Solenoids +70°C -30°C PCB Mount Circuit Board
Opto 22 G4 PLC I/O Module 1 Inputs, 1 Outputs 3 A 24 → 280 V ac, 48.8 x 12.2 x 41.1 mm Opto 22 57 G4 1 1 Digital Digital AC Voltage - - 24 → 280 V ac 3 A Digital AC Output 48.8mm 12.2mm 41.1mm 48.8 x 12.2 x 41.1 mm 18mA - 19.5 → 32 V dc AC Relays, Heaters, Indicators, Lamps, Motor Starters, Solenoids +70°C -30°C PCB Mount Circuit Board
Wago I/O SYSTEM 750 PLC I/O Module, 100 x 12 x 64 mm Wago 52 I/O SYSTEM 750 - - - - 750 Series - - - End Module 100mm 12mm 64mm 100 x 12 x 64 mm - - - - - - - -
Siemens S7-200 Series PLC I/O Module 4 Inputs, 4 Outputs 24 V dc Siemens 45 S7-200 Series 4 4 Digital Digital S7-200 Series - 24 V dc - I/O Module - - - - - - - - - - - -
Opto 22 G4 PLC I/O Module 1 Inputs, 1 Outputs 3 A 12 → 140 V ac, 48.8 x 12.2 x 41.1 mm Opto 22 35 G4 1 1 Digital Digital AC Voltage - - 12 → 140 V ac 3 A Digital AC Output 48.8mm 12.2mm 41.1mm 48.8 x 12.2 x 41.1 mm 12mA - 5 V dc AC Relays, Heaters, Indicators, Lamps, Motor Starters, Solenoids +70°C -30°C PCB Mount Circuit Board
Omron SYSMAC CJ Series PLC I/O Module 16 Outputs 2 A 24 V dc, 250 V ac, 89 x 31 x 95.4 mm Omron 34 SYSMAC CJ Series - 16 - Digital, Relay SYSMAC CJ Series 16 24 V dc, 250 V ac 2 A - 89mm 31mm 95.4mm 89 x 31 x 95.4 mm - - - - - - - -
Mitsubishi MELSEC FX PLC I/O Module 4 Inputs, 5 V dc, 24 V dc, 90 x 55 x 87 mm Mitsubishi 33 MELSEC FX 4 - Analogue - MELSEC FX Series 4 5 V dc, 24 V dc - - 90mm 55mm 87mm 90 x 55 x 87 mm - - - - +55°C 0°C - -
Opto 22 Digital I/O Module, 18.29 x 82.55 x 69.85 mm Opto 22 31 - - - - - - - - - - 18.29mm - 82.55mm 18.29 x 82.55 x 69.85 mm - LED Indicator, Pluggable Wiring - - +70°C -20°C Rack Mount, Snap-In -
Siemens SM 1223 PLC I/O Module 16 Inputs, 16 Outputs 500 mA 24 V dc, 100 x 70 x 75 mm Siemens 31 SM 1223 16 16 Digital Digital SIMATIC S7-1200 Series 32 24 V dc 500 mA - 100mm 70mm 75mm 100 x 70 x 75 mm - - - - +70°C -40°C - -
S7-1200 COMMUNICATION BOARD CB 1241 Siemens 30 S7-1200 - - - - S7-1200 Series - - - - 62mm 38mm 21mm - - - - - - - - -
Siemens SIMATIC ET 200S PLC I/O Module 4 Inputs, 24 V dc, 81 x 15 x 52 mm Siemens 30 SIMATIC ET 200S 4 - Digital - SIMATIC ET 200S Series 4 24 V dc - - 81mm 15mm 52mm 81 x 15 x 52 mm - - - - +55°C 0°C - -
Siemens SIMATIC S7-300 Series PLC I/O Module 16 Outputs 2 A 24 → 240 V ac, 24 V dc, 125 x 40 x 120 mm Siemens 28 SIMATIC S7-300 Series - 16 - Digital, Relay S7-300 Series - 24 → 240 V ac, 24 V dc 2 A - 125mm 40mm 120mm 125 x 40 x 120 mm - - - - - - - -
PLC memory mod,6ES7 291 8GF23 0XA0 64kB Siemens 27 - - - - - S7-200 Series - - - Memory Module - - - - - - - - - - - -
Schneider Electric TM3 Series PLC I/O Module 4 Inputs, -10 → 10 V dc, 90 x 23.6 x 70 mm Schneider Electric 26 TM3 Series 4 - Current, Temperature, Voltage - Modicon M221, Modicon M241, Modicon M251 - -10 → 10 V dc - - 90mm 23.6mm 70mm 90 x 23.6 X 70 mm - - - - - - - -
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