Specifications

11
flowserve.com
MX Protection, Control and Monitoring Features FCD LMENTB2300-01 – 07/08
When enabled, a User may set up the partial stroke and ESD signals as redundant digital inputs for
safety. There are two signal inputs for either selection, and both must be in the active state in order for
the specific function to occur.
If the partial stroke enable inputs are not active, in a fault state, or are released by the control logic and
a signal is detected on the momentary ESD/PSESD input, then the actuator will perform the configured
ESD operation. The momentary ESD/PSESD input will be ignored if there is a signal present for less
than 100 msec, and is guaranteed to latch in the ESD/PSESD if the signal is present for greater than 800
msec. ESD is active until the control logic ESD Release is given.
Please contact factory for application and purchase.
3. Network Communications
The MX provides a comprehensive network option portfolio to the user. Network solutions are improved
with the addition of DeviceNet to complement Modbus, F
o u n d a t i o n Fieldbus H1, Profibus DP_V1 and
Profibus PA. MX 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.
3.1 DDC (Distributed Digital Control) Communication – Modbus
™
DDC is Flowserve Limitorque’s digital communication control system that 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 redundant. 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.
DDC Network
Single-ended loop (as standard – See Figure 13.1)•
Modbus protocol•
High speed – up to 38.4K baud•
3.2 Master Station II
MX units equipped with DDC can be controlled via Flowserve Limitorque’s Master Station II. It
includes:
Host interface – RS-232 or RS-485 with TCP-IP (Ethernet) as standard (Modbus•
™
protocol)
LED indicator for network status•
Configurable polling sequence priority•
Configurable bitmap to host•
Redundant RS-485 network ports•
High-level surge protection on network•
Logging port for maintenance PC •