Communications:
The 745 is equipped with three standard serial communications ports, one RS232 located in the front panel, and two RS485/RS422 in the rear of the relay. One optional Ethernet port is available at the rear of the relay. The front panel port allows easy local computer access. The rear ports provide remote communications or connection to a DCS, SCADA, or PLC. The baud rate of all the ports is variable from 300 to 19,200 bps. The optional Ethernet port can be used to connect the 745 to 10 Mbps Ethernet networks. The 745 supports ModBus® RTU, DNP3.0 Level 2, and ModBus® RTU TCP/IP protocols.The three serial ports support ModBus® RTU protocol, while either of the two rear ports can be configured to support DNP 3.0 Level 2. The optional Ethernet port supports ModBus® RTU via TCP/IP protocol. The communication system of the 745 is designed to allow simultaneous communication via all ports.Using Ethernet as the physical media to integrate the 745 to Local or Wide Area Networks, replaces a multidrop-wired network (e.g., serial Modbus®), and eliminates expensive leased or dial-up connections, reducing monthly operating costs.
User Interface:
Various user interfaces facilitate operation of the 745
Display
A 40 character display allows access to setpoints, actual values, and diagnostic messages generated by a trip or alarm condition. The 745 can display 30 user-selected messages during keypad inactivity.
Indicators
Twenty LEDs indicate relay status, system status, and trip and alarm conditions.
IRIG-B Input
This feature provides time synchronization via standard GPS clock inputs.
EnerVista Software:
The EnerVista™ Suite is an industry-leading set of software programs that simplifies every aspect of using the 745 relay. The EnerVista™ suite provides all the tools to monitor the status of the transformer, maintain the relay, and integrate information measured by the 745 into DCS or SCADA monitoring systems. Convenient COMTRADE and Sequence of Events viewers are an integral part of the 745 Setup software included with every 745 relay, to carry out postmortem event analysis to ensure proper protection system operation.
