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2301E Digital Control Manual 26641
142 Woodward
actuator current to zero and activates the shutdown relay. The Controlled
Shutdown function is used to stop the engine in a controlled manner, as opposed
to an Emergency Trip. When a STOP command (controlled shutdown) is issued
the shutdown relay is not activated.
The Emergency Shutdown and Controlled Shutdown commands do not influence
the operation of the Trip Relay.
Start Command through Modbus
The start-up permissive of a prime mover is possible from a command through
the Modbus. The open/close of contact inputs (RUN/SHUTDOWN, etc.) serve as
the independent command in Modbus BW. These commands operate as a
momentary input. Which means the input from the Modbus commands are
latching.
For More Modbus Information
Detailed information on the Modbus protocol is presented in “Reference Guide
PI-MBUS-
300” published by AEC Corp./Modicon Inc., formerly Gould Inc. To
implement your own source code, you must register with Modicon. Registration
includes purchasing document PI-MBUS-303 and signing a non-disclosure
agreement. You can register to use Modbus at your nearest Modicon field office.
To find the office nearest you, contact Modicon Technical Support at
+1-800-468-5342 (in North America).