Owner`s manual

Table 3–2: Upper Key Switch
Position Effect Light Color
O (Off) Removes all power, except to the battery backup
charger and optional storage.
No light
Standby Supplies power to XMI backplane, blowers, and in-
cabinet console load device.
Red
Enable Supplies power to whole system; console terminal is en-
abled. Used for console mode or restart, and to start
self-test.
Yellow
Secure
(Normal Position)
Prevents entry to console mode; positionused while ma-
chine is executing programs. Disables Restart but-
ton. When switch at Secure, the system per-
forms an automatic restart, regardless of the set-
ting of the lower key switch.
Green
The upper key switch has four positions: Off, Standby, Enable, and Secure.
You change the position of the upper key switch by inserting and turning
a key. A light to the right of each key position lights to show what mode is
in operation. When the switch is set to Off, no lights are lit. Each position
modifies power to the system as follows:
• Off removes all power from the system, disabling the battery backup
unit’s output. This position is a total off, except for power to the battery
charger and optional storage. To ensure total absence of power in
the machine, pull the circuit breaker and unplug the machine. See
Section 3.6.
• Standby powers the XMI backplane, blowers, and in-cabinet console
load device.
• Enable supplies power to the entire system. While the upper switch is
in the Enable position, you can use the console (see Chapter 5) or the
Restart button (see Section 3.4). Also, when you move the upper switch
from Standby to Enable, the system runs self-test. If the power goes off
with the switch in the Enable position, the operation of the system is
controlled by the position of the lower key switch. Figure 3–2 shows the
upper key switch with the key in the Enable position and the Enable
light lit.
• Secure prevents interruptions to program execution. When the switch
is in the Secure position, the console terminal can only be used as a
user terminal (in program mode). A CTRL/P does not cause a switch
to console mode. Secure also disables the Restart button. If the power
goes off with the switch in the Secure position, the system may reboot
if it has a battery backup unit or if power is restored.
Controls and Indicators 3–5