3. Operation of the Control Panel Output Circuit Trouble Mode of Operation
36 NFS-640 Operations Manual P/N 51334:B 10/03/2003
How the Control Panel Indicates a NAC Trouble
A Trouble occurring on a NAC causes the control panel to do the following:
• Produce a pulsed audible tone
• Flash the
SYSTEM TROUBLE LED
• Turn on the Trouble relay (TB9)
• Send a message to the LCD display, History buffer and installed printers, terminal mode LCD-
80s, and CRT-2s
• Display a
TROUBL status banner and a CONTROL Type Code on the LCD display, along with
information specific to the device
Figure 17 Sample of a NAC in Trouble Message
How the Control Panel Indicates a Panel Circuit Trouble
A trouble occurring on a Panel Circuit causes the control panel to do the following:
• Produce a pulsed audible tone
• Flash the
SYSTEM TROUBLE LED
• Turn on the Trouble relay (TB9)
• Send a message to the LCD display, History buffer and installed printers, terminal mode LCD-
80s, and CRT-2s
• Display a
TROUBL status banner and CONTROL Type Code on the LCD display, along with
information specific to the device
Figure 18 Sample of a Panel Circuit in Trouble Message
How the Control Panel Indicates a Control/Relay Trouble
A trouble occurring on a control/relay module or control/relay transponder causes the control panel to
do the following:
• Produce a pulsed audible tone
• Flash the
SYSTEM TROUBLE LED
• Turn on the Trouble relay (TB9)
• Send a message to the LCD display, History buffer and installed printers, terminal mode LCD-
80s, and CRT-2s
• Display a
TROUBL status banner and CONTROL Type Code on the LCD display, along with
information specific to the device
Figure 19 Sample of a Control/Relay Module in Trouble Message
Status banner
Type Code
Time and date of trouble
TROUBL CONTROL PANEL CIRCUIT NO. 2
OPEN 09:38A 071401 B02
Device Address
Type of Trouble
Custom Description for
this device location
TROUBL CONTROL PANEL CIRCUIT P8-8
OPEN 09:38A 071401 P8.8
Status banner
Type Code
Time and date of trouble
Device Address
Type of Trouble
Custom Description for
this device location
TROUBL CONTROL MODULE ADDR 1M044
OPEN 09:38A 071401 1M044
Status banner
Type Code
Time and date of trouble
Device Address
Type of Trouble
Custom Description for
this device location
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