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Distributed I/O

Eaton’s SMP I/O platform is a substation-grade module specially designed to meet the requirement for distributed I/O in modern utility substation automation systems. The SMP I/O platform supports binary input and binary output modules, as well as analog input modules. It operates with AC or DC voltage, and communicates using the DNP3 protocol over serial RS-485 or TCP/IP using fiber or copper Ethernet. It supports IEC 61850 GOOSE messaging and can be integrated with the SMP Gateway or used as a standalone I/O module that connects directly to a DNP3 master station. The SMP I/O platform is one of Eaton's grid automation system solutions.

Easy integration to automation platform
Improved productivity
Modular I/O cards
Increased flexibility
Substation grade
Rugged reliability

Core features

  • Distributed architecture, substation-grade in rack or wall-mount models
  • Small form factor (1U)
  • Supports binary input/output cards and analog input cards
  • Seamless networking is facilitated through the SMP I/O’s Ethernet and  RS-485 port, and by relying on the industry-standard DNP3 protocol
  • Error-detection features ensure data integrity between the data point and the control center, with supported IRIG-B synchronization for precise timestamping
  • All wiring resides on the rear panel through removable terminal blocks, with a front panel that displays the status of the device and the state of all I/O signals
  • Provides two programmable form-C output relays

Supporting IEDs in distributed systems

The architecture of automation systems has moved from a centralized approach, based on large RTUs, to distributed systems based on Intelligent Electronic Devices (IED) with built-in I/O capability. However, not all I/O can be managed by the IEDs and numerous functions require an I/O processor. Eaton’s SMP I/O is specially designed to fill this gap.

Typical applications

When using a standalone SMP I/O, a master station can monitor and control remote devices using the DNP3 protocol, with accurate IRIG-B time-stamping, effectively replacing a traditional RTU. It is designed to provide seamless integration with the SMP Gateway. It transparently adds support for discrete and analog I/O to the automation platform. Eaton's SMP Gateway extends the SMP I/O through is extensive protocol support, logic processing, built-in HMI and security features
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