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the operator has specified an automatic IML after power-on using the System
Configuration-Customer display.
Then a power-on reset of the 4381 Processor (clear reset and time-of-day
clock reset) is performed. The processor is placed in the stopped state and the
Program Load display is shown on the operator console. When a power-on is
not successful, an IML and reset do not occur. This pushbutton is also used to
perform an IML of the support processor only when power is already on.
The natively attached 3205 or 3278 Model 2A and/or 3279 Model 2C
displays and 3287 and/or 3268 Printers must be powered on individually.
Power to these natively attached devices should be turned on before the Power
on/IML pushbutton is pressed. At least one display console must be powered
on in order to power up a 4381 Processor. The Channel-to-Channel Adapter
must be enabled using the channel-to-channel pushbutton.
•
Power-off pushbutton. This pushbutton is used only to remove power from the
4381 Processor (not the 3205, 3278, and 3279 displays or 3287 and 3268
printers) under control of the power-off sequencing microcode that is resident
in the support processor.
•
Channel-to-channel pushbutton. When the optional Channel-to-Channel
Adapter is installed, this pushbutton is used to enable and disable the logical
interface to the other processor to which the adapter is attached.
•
Chan-chan disabled indicator. This indicator is lit to indicate the
Channel-to-Channel Adapter logical interface to the other processor is not
enabled. This indicator should be on before the 4381 Processor is powered
off. In addition, before a 4381 Processor with the Channel-to-Channel
Adapter is powered on or off, the processor to which the adapter is attached
should be soft stopped to ensure its operation is not impacted.
•
Power-in-process indicator. This light turns on as soon as the power-on/IML
pushbutton is pressed and stays on until power-on sequencing of all system
components is successfully completed, at which time it is turned off. This light
also turns on during a power off sequence.
•
Power-complete indicator. When lit, this light indicates power is on.
It
is
turned on at the successful completion of a power-on sequence when the
power-in-process indicator is turned off.
•
Basic check indicator. When this indicator is lit, a hardware malfunction exists
in the support processor or the processor is in CE mode.
•
System indicator. This indicator is lit whenever instruction processing or 1/0
data transfer is taking place.
•
Wait indicator. This indicator is lit when instruction execution is not occurring
because the current PSW has the wait bit on. For a 4381 Model Group 14 or
3, this indicator is lit if either instruction processor is in the wait state.
•
Lamp test pushbutton. When pressed, this pushbutton causes all functional
indicator bulbs on the operator control panel to be lit and is used for testing
. .....,..,
purposes.
Section 40: Operator Console
87
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