Flowserve UEX Limitorque - Manual (Page 29)

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Limitorque UEX FCD LMENIM1205-03-AQ – 05/15
flowserve.com
The UEX provides a comprehensive network option portfolio to the user. Network solutions are improved
for the user that has an L120 with UEC, with the addition of DeviceNet to complement Modbus, F
oundation
Fieldbus H1, Profibus DP_V1 and Profibus PA. UEX provides the user with predictable, reliable, and safe
operation for years to come, in applications which are subject to the most rigorous requirements and
environmental extremes.
With each of the provided network protocols a user may configure the unit to move to a predefined
fail-safe position on loss of communication. Action on loss of command signal OPEN, CLOSE, STOP, or
MOVE-TO preconfigured position. The user may also configure the length of time communication must be
lost before the unit indicates communication loss and performs the communication loss action.
9.1 Modbus ™
Modbus ™ provides the ability to control and monitor up to 250 actuators over a single twisted-pair
cable. The communication network employs Modbus ™ protocol on an RS-485 network and is redun-
dant. Redundancy assures that any single break or short in the communication cable will not disable
any actuators. Each actuator has included an addressable field unit that communicates over the twisted
pair network and executes open, close, stop, ESD, and GO TO position commands. The field unit
also communicates all actuator status and alarm diagnostic messages over the same communication
network.
Modbus Network
• Single-ended loop (as standard – See Figure 16.1)
• Modbus protocol
• High speed – up to 19.2K baud
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Network Communications