
B–62075E/04
2. HARDWARE
160
With the Series 15–B, if an error occurs on a PC board other than the main
board or sub–board, the red LED on the main board or sub–board may
light.
The tables below list the ALARM LED statuses when an error occurs on
the main board or on a sub–board:
ALARM LED display when an error occurs
(when the main CPU is MAIN–A or MAIN–B)
Main board Sub–board Description
jjJ SYSEMG. jjJ SYSEMG. An NMI error occurred on the PMC, remote buff-
er, or a PC board other than the main board or
sub–board on the F–bus.
The power supply unit supplies a lower–than–
normal voltage.
JJj SERVO
ALARM
jJj SYSFAIL An error occurred in the servo module on the
main board.
The software detected an error on a PC board on
the F–bus.
jjJ SYSEMG. JJj SERVO
ALARM
An error occurred in the servo module of the
sub–board.
ALARM LED display when an error occurs
(when the main CPU is MAIN–C)
Main board Sub–board Description
jJj SYSFAIL jJj SYSFAIL The software detected an error on a PC board on
the F–bus.
jjJ SYSEMG. jjJ SYSEMG. An NMI error occurred on the PMC, remote buff-
er, or a PC board other than main board or sub–
board on the F–bus.
The power supply unit supplies a lower–than–
normal voltage.
JJj SERVO
ALARM
jJj SYSFAIL An error occurred in the servo module on the
main board.
jJj SYSFAIL
or
jjJ SYSEMG.
JJj SERVO
ALARM
An error occurred in the servo module on the
sub–board.
ALARM LED display when an error occurs
(when the main CPU is MAIN–A, –C)
Main board Sub–board Description
jJj SYSFAIL jJj SYSFAIL A software–detected error occurred on a PC
board on the F–bus (including the F–bus on the
additional shelf side).
jjJ SYSEMG. jjJ SYSEMG. On the main shelf side, an NMI error occurred on
the PMC, remote buffer, or a PC board on the
F–bus other than the main board and sub–board.
The voltage being supplied from the power sup-
ply unit dropped.
JJj ADD
SHELF
SYSEMG.
jJj SYSFAIL An NMI error occurred on a PC board on the
additional shelf side.
The voltage being supplied from the power sup-
ply on the additional shelf side dropped.
2.5.22
Alarm LED Display
(Red) in the Event of an
Error