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How the Control Panel Works in Normal Operation
16 AFC-600 Operations PN 51033:A 3/8/99
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The system operates in Normal mode when no alarms or troubles exist. In Normal
mode, the control panel displays a system message as follows:
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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
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