Emerson EPXCPE220 PACSystems RSTi-EP Backplane Controller, 3xRJ45 1Gbps Ethernet

The FloBoss S600 Flow Manager offers multiple communication interfaces:

• One or two Ethernet 10baseT ports. An optional second Ethernet port

can be added if required.

• HART communication is facilitated using a 12 channel HART board,

supporting point-to-point and multi-drop architectures (up to 50 transmitters).

• An embedded webserver allows remote access to the flow computer.

Security is provided by way of user name and password protection with

a detailed event log for audit purposes. Supports Windows® Internet

Explorer® version 5 or greater.

Emerson Controlinc Network Masters are the master of Emerson Controlinc valve

actuator networks with Modbus RTU protocol. The system provides network management,

data concentration and protocol conversion, off-loading the host system of these tasks.

This enhances overall system performance and minimizes software development and

system configuration tasks by the system integrator. The Network Master serves as the

master of a master/slave network. It manages the network by keeping an orderly cycle of data

transfers to and from the slave devices (valve actuators). It handles error detection, alarming,

and network recovery. The Network Master serves as a data concentrator for the host by

providing a common database for all slave devices. The host is required to communicate

with only one slave device (network master) for all data transfers to and from the field.

Data can be transferred between the network master and host in large blocks at a much

higher communications rate than would be possible if the host communicated with each

slave device (valve actuator) on the field network.

The Network Master acquires data fromthe valve actuators by polling or scanning each

device in a sequence of slave address from a table called a scan list. Polling is a process

of the Network Master sending to each slave  address, a command to return its status information,

including alarms, discrete and analog inputs and outputs. When control commands

(valve open, stop, close, position set point, etc.) are generated by a host system up-line

of the Network Master, it then sends the appropriate commands over the network to

the addressed slave device.

A more detailed functional description of operation is provided in the Theory of Operation

section of this manual. The reliability of the analog performance of the FloBoss S600 allows

longer intervals between calibration checks.