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For controller installations where end devices are located long distances away, field I/O or distributed I/O systems can greatly improve system efficiency and reduce wiring costs. Localizing field terminations at the machine or device being monitored/controlled allows for easier installations/modifications, shorter wire runs, and faster troubleshooting.
Field I/O Systems
Category Selection
Field I/O systems are available in a variety of form factors and protocol compatibility, most typically Modbus (RTU or TCP) and Ethernet or EtherNet/IP. IO-Link is a newer and very popular field I/O system that incorporates extended diagnostic information from IO-Link compatible sensors/actuators with standard I/O signals.
Field I/O Overview
IO-Link
Typical of field I/O systems, IO-Link connects remote sensors and actuators to a central control system, providing real-time process values and control signals. However, IO-Link also allows additional data to be collected from intelligent field devices, including the device's condition, configured parameters, and performance data.
- Handles traditional field I/O signals (position, pressure, temperature, etc.) along with diagnostic data including sensor/actuator errors and the health of each connected IO-Link capable device
- Machine-mountable components with IP65, IP67 and IP68 ratings
- Master modules have a built-in web server for easy access to device status, configurations, and diagnostics
- IO-Link masters available that convert IO-Link signals to/from EtherNet/IP, OPC UA, and MQTT
- IO-Link hubs connect several non-IO-Link enabled sensors and actuators to an IO-Link master via a single standard M12 cable
- A selection of IO-Link capable sensors available
Protos X I/O
The Protos X compact, modular field I/O system allows a user to monitor and control remote field I/O devices without having to invest in another controller. The easy-to-install design saves time and excess field wiring and speeds up troubleshooting.
- The ultra-compact design makes it perfect for applications where a typical PLC or I/O solution simply would not fit
- Unique interlocking design of the terminals means the data and power buses are carried from module to module and used only when needed
- Four bus coupler models support Modbus RTU, Modbus TCP and EtherNet/IP protocols
STRIDE Field I/O Modules
The Stride Field I/O family of modules provides a simple and economical means to connect inputs and outputs to a Modbus TCP communications network. Each module operates as a standalone Modbus TCP server, and can be configured via a built-in web server.
- Interfaces remote I/O points to a Modbus TCP network via Ethernet 10/100 Base-T
- Digital inputs, discrete relay and transistor outputs
- Analog current, voltage, resistance and temperature inputs; analog current and voltage outputs
NITRA PAL I/O
The NITRA Pneumatic Automation Link (PAL) system is an electro-pneumatic system as well as a field I/O system that can include electrical I/O or pneumatic valves or both. A system can be controlled either by an EtherNet/IP master or direct wiring (for configurations with exclusively pneumatic valves).
- Supports up to 16 discrete input and 16 discrete output modules per system, plus 4 analog output, and 4 analog temperature
- IP65 rated, machine mountable system decreases design and installation time
- Quick-disconnect electrical and push-to-connect pneumatic connections keep installation clean and simple
- Local expansion allows for several subsystems controlled from one EtherNet/IP node
Terminator I/O
Terminator Field I/O combines I/O points with their field terminations into a modular package to save panel space and money. With Terminator I/O, you can use distributed I/O nodes close to field devices for faster and more efficient wiring and troubleshooting.
- Network interface modules support Ethernet, DeviceNET, MODBUS and Koyo remote I/O; some adapters include an on-board RS232 serial port
- Discrete and analog industrial I/O modules with modular terminal bases
- Configuration flexibility by plugging together a network interface module with up to 16 I/O modules
- For high power systems, combine multiple power supplies on a single I/O set
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