Local Operation
3-22
M370078-01
Alarm Output Latching
When an alarm is triggered, the output will be disabled with the exception
of the Fan alarm. When an alarm is cleared, the alarm output latch
determines if the output should be re-enabled to the state before the alarm
occurred or if the output should remain in the off state.
Where setting the bit position (1) of an alarm latch will result in output
latching to the off state when the alarm is cleared and if cleared (0) output
will be re-enabled to the state before the alarm triggered.
To define the values for the bit position you determine which alarms you
want to latch. Read the value for this bit position from Table 3-6 and sum
them together. The result is the alarm last mask. Which you should send
with the SCPI command.
For Example:
If you wanted to enable latching for OTP and Foldback you would
take the OTP value of 2 and add it to the foldback value of 256 to get
a mask of 258. This is the value you would send with the SCPI
command.
The output latches are accessible through the SCPI command.
The SCPI command (s) for these instructions are:
[:]SYSTem[<channel>]:PROTection:LATCh
The latch command take a single decimal parameter made up of the sum
of the values for the alarms to determine if they are to be latched in the off
state on clearing. See Table 3-6 for the values associated with each
latchable alarm.
Table 3-6
Alarm Latch Bit Positions
Alarm
Bit
Position
Value
AC Fail
0
1
Over Temperature Protection (OTP)
1
2
Foldback
8
256
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