Det-Tronics EA2100CG Eagle 2000 Communication Gateway - Manual (Page 6)

COMMUNICATION GATEWAY – EA2100CG
The gateway provides the communication link between
the communication module/detector and a Det-Tronics
Operator Interface Station, programmable logic con-
troller (PLC), distributed control system (DCS) or other
host device. Registers in the gateway are used for
passing information between the gateway and the host
or between the gateway and nodes on the network. The
gateway communicates through an RS232 or RS422
serial port using Modbus protocol.
Local annunciation capability is provided using LEDs, a
three digit display, and a twenty segment bar graph dis-
play on the faceplate of the gateway. The LEDs indicate
normal operation, alarm, calibration or fault condition.
When an alarm condition occurs at a node on the net-
work or when a calibration or fault event occurs, the
address and type of detector are identified on the digital
display, and the percentage of full scale is indicated on
the bar graph. If a single event occurs, the gateway
display shows the pertinent information for the detector
at that specific address. If more than one event should
occur at the same time, the display will sequentially
show each detector’s information by order of address.
Five relays are also provided – four fully configurable
alarm relays and one fault relay.
The use of additional gateways (each with its own host
connection) is possible, thereby ensuring enhanced
system fault tolerance.
The communication gateway is a rack mountable device
that occupies two spaces in a standard Det-Tronics
mounting rack (in control room location).
Refer to Section IV of this manual for a complete
description of gateway operation.
COMMUNICATION MODULE – EA2300CM
Each detector on the loop has its own communication
module. The communication module enables a conven-
tional detector to be converted to an addressable
detector. It provides communication capability for the
detector by digitizing a 4 to 20 ma output and transmit-
ting the value as a process variable to the gateway. The
communication module can also accept two digital con-
tact inputs. In addition, the communication module
sends status and diagnostic information for itself and its
detector to the gateway.
The communication module consists of an electronic
printed circuit board incorporating state-of-the-art com-
munication technology, mounted inside a watertight,
explosion-proof aluminum junction box. It is designed
for use in hazardous locations and is typically mounted
at or near the point of detection.
DIP switches on the communication module circuit
board are used to set the address of the communication
module, enabling the communication gateway to identi-
fy each individual detector in the system.
Refer to Section II of this manual for a complete descrip-
tion of communication module operation.
DIGITAL COMMUNICATION UNIT – EA2200DCU
The Digital Communication Unit (DCU) digitizes a 4 to 20
ma analog signal from a sensor/transmitter and transmits
the value as a process variable to the gateway. The DCU
consists of an aluminum enclosure containing a communi-
cation module circuit board and a terminal wiring board.
The communication module circuit board is identical to the
circuit board used in the communication module described
above. The DCU enables the use of Det-Tronics basic
sensor/transmitters, which attach directly to the DCU
enclosure, and provides a means of performing non-intru-
2
422/232
OR
60 SENSORS AND / OR 2000 METER LOOP
EAGLEVISION ™
OIS
POWER SUPPLY
PLC
DCS
COMMUNICATION
GATEWAY
(EA2100CG)
PORT (2)
NODE 2 NODE 3 NODE 4
NODE 5
OR
PORT (1)
NODE 1
DIGITAL
COMMUNICATION UNIT
(EA2200DCU)
DET-TRONICS
FLAME
DETECTION
DET-TRONICS
GAS
DETECTION
DET-TRONICS
ENVIRONMENTAL
MONITORING
COMMUNICATION MODULES (EA2300CM)
NETWORK
EXTENDER
(EA2400NE)
A1551
Figure 1—Simplified Eagle System