7.5.6 High–speed serial bus (HSSB) board
High–speed serial bus (HSSB) board A20B–8001–0730
D Connector and LED locations
serial bus set-
At maintenance: 0
serial bus (HSSB)
Name Color Meaning Required action
LED B Red HSSB–based com-
– Check the HSSB cable.
– Check the PC or intelligent termi-
– Replace the printed–circuit board.
LED A Red A RAM parity alarm
occurred in the
If this LED is on, replace the printed–
circuit board though the alarm can
sometimes be released by turning
the power off then on.
Green LED status display J : on and j : off
4 3 2 1
J J J J The power has just been switched on.
J J J j The HSSB board is being initialized.
J J j J The HSSB is waiting for the PC to complete booting.
J J j j The CNC screen is displayed on the PC.
J j j j Start–up has been completed normally, and the regular operation
is under way.
j J J j A thermal error has been detected at the intelligent terminal.
j J j J HSSB–based communication has been interrupted.
j J j j A RAM parity alarm condition has occurred in the common RAM.
j j J J A communication error has occurred.
j j J j A battery alarm condition has occurred at the intelligent terminal.