Chapter 11 Gen 2 Environmental Alarm System
Gen 3 Site Controller System Manual
EAS2 Functional Description
11-4
68P80801E30-A 5/1/2002
The Site Controller and EAS2 interact in a master/slave relationship. The
Site Controller sends commands to the EAS2 to determine the status of
alarm inputs or set the state of control outputs. The EAS2, in turn, sends
alarm status responses to the Site Controller.
The EAS2 continuously scans the status of the alarm inputs, ensuring that all
alarms are consistently monitored.
TEBTS029_2
010802JNM
IEEE1284
PORT1
17
IEEE1284
PORT2
17
10MHz OSC
RESET
CONTROLLER
SERIAL
EEPROM
(XC17S20XL)
OPTO-
ISOLATORS
A/D
CONVERTER
OPTO-
ISOLATORS
(48X)
RELAYS
(8X)
4 INPUTS
5 OUTPUTS
8 BI
3
8
48
FPGA
(XCS20XL)
56 INPUTS
20 OUTPUTS
16 BI
92 TOTAL I/O
8
48
LED’s (ON POWER SUPPLY)
RELAYS
ALARM INPUTS
-48V
BATTERY
DC-DC
CONVERTER
+3.3 VDC
-48 VDC FROM
BATTERY
CONNECTOR
Figure 11-2
EAS2 Block Diagram