Emerson DM6391 ac2 Interface Card

Power Input

The system operates from 120 V AC or 220 V AC, 50/60 Hz single-phase power with

internal three wire power terminals. Ensure that a good safety ground is provided to the

electrical supply to which the power input is connected. The system contains three main fuses

(6.3x32 mm, 1 A) in the DIN-rail mounted fuse blocks. Each chassis and the LCD touch panel

are independently fused. Each NIM is powered from redundant 24 V DC power supplies from

the two chassis power supplies. The LCD touch panel is powered from an independent 24 V DC

power supply. All other modules within the unit are powered over the base back plane from the

associated main chassis power supply.

Mounting of Rack Mount Enclosure

The enclosure is designed for standard EIA 19 in. DIN rail rack mounting. Dimensions of the

enclosure are shown in Figure 7. The enclosure conforms to EIA RS-310. IEC 297-1. and DIN 41

494. Part 1 standards. The rack in which the enclosure(s) are mounted must allow a minimum

of 20 in. / 508 mm depth, allowing space for cable connections. If the system includes backup

LCD keypad terminals, some planning is required to allow for proper height above the floor to

view the display and operate the keypad properly.

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.