PLC Input and Output Modules

PLC input and output modules (I/O modules) are expansion units that carry sensor, push button and transmitter signals from the field to the PLC processor and pass the processor's commands to devices such as relays, valves and drives. They are added to machine and process panels when the built-in I/O count on the CPU is not enough, or when an additional function such as temperature measurement, weighing or communication is required. The subcategories include digital and analog input and output modules as well as communication, temperature, load cell and remote I/O modules; most of the products are from Schneider Electric, ABB and Delta Electronics. Select the module according to the brand and series of your PLC, the signal type (digital or analog), the channel count, the input/output type such as NPN, PNP or relay, and the current or voltage signal range. Local expansion modules use a series-specific bus; verify the number of modules the CPU supports and its supply capacity from the manufacturer's data. This page also includes ABB input/output and interface modules and Schneider Electric Edge I/O NTS modules.

Products

How to choose PLC Input and Output Modules

PLC input and output modules (I/O modules) are expansion units that carry sensor, push button and transmitter signals from the field to the PLC processor and pass the processor's commands to devices such as relays, valves and drives. They are added to machine and process panels when the built-in I/O count on the CPU is not enough, or when an additional function such as temperature measurement, weighing or communication is required.

  • Separate sensing, motion control, logic processing and operator interface requirements.
  • Select signal type, supply voltage, communication protocol and I/O count for the machine network.
  • Verify housing size, sensing distance and PNP/NPN output polarity against the PLC input card.

Frequently asked questions

What is PLC Input and Output Modules and where is it used?

PLC input and output modules (I/O modules) are expansion units that carry sensor, push button and transmitter signals from the field to the PLC processor and pass the processor's commands to devices such as relays, valves and drives. They are added to machine and process panels when the built-in I/O count on the CPU is not enough, or when an additional function such as temperature measurement, weighing or communication is required.

What should I compare when choosing PLC Input and Output Modules?

Select the module according to the brand and series of your PLC, the signal type (digital or analog), the channel count, the input/output type such as NPN, PNP or relay, and the current or voltage signal range.

Which product groups are available under PLC Input and Output Modules?

The current subcategories include Analog I/O Modules, Analog Input Modules, Analog Output Modules, Communication Modules, Connection Modules, Digital I/O Modules. Open a subcategory to compare its products and technical details.

PLC Input and Output Modules Selection Guide