3. Operation of the Control Panel Normal Mode of Operation
22 NFS-640 Operations Manual P/N 51334:B 10/03/2003
Normal Mode of Operation
The system operates in Normal mode when no alarms or troubles exist. In Normal mode, the control
panel displays a System Normal message as follows
Figure 5 Sample System Normal Message
In Normal mode, the control panel does the following functions at regular intervals:
• Polls all SLC devices, Panel Circuits, and the four NACs to check for valid replies, alarms,
troubles, circuit integrity, and supervisory signals, and so forth
• Checks power supply troubles and batteries at 10-second intervals
• Sends a supervisory query on the optional terminal mode LCD-80 and verifies proper response
• Refreshes the LCD display and the optional terminal mode LCD-80 display and updates time
• Scans for any keypad or Control Key entries
• Performs a detector automatic test operation
• Tests system memory
• Monitors for microcontroller failure
SYSTEM NORMAL 01:56P 071401 Sat
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