Sequence Of Events; Power And Module Cooling Considerations - Racal Instruments 1260-22 User Manual

Publication No. 980673-055 Rev. A
Sequence of
Events
Power and Module
Cooling
Considerations
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When a reset event occurs, the following sequence takes place:
•
The 1260-22 recognizes the reset event and sets a logic
latch.
•
All relays are opened on the 1260-22. This occurs within the
time it actually takes the contacts to open, typically fifteen
milliseconds.
•
If the scope of the reset function is set to global, then all
relays on all switch products connected to the same Option-
01T are also opened. This happens independently of
software.
•
An interrupt is generated to notify the Option-01T that a
reset event has occurred. This informs the Option-01T that
the relays have opened, so that it remains up-to-date on the
relay status.
•
The relays remain open and do not respond to any
commands from the Option-01T.
•
After the reset condition is removed (the external switch is
returned to its normal position), the relays remain open until
otherwise commanded by the Option-01T.
Once a reset condition has occurred, no communications can
occur between the Option-01T and any switch modules until the
reset condition is removed. When the reset condition is removed,
the relays remain in the open state until operated under software
control.
If the user issues a relay command while a reset condition is
applied, then the following message shall be received:
-300 "DEVICE-SPECIFIC
PREVENTS EXECUTING OF COMMAND OR OPERATION."
The 1260-22 is a high density, high power switch module
capable of switching high current levels. Because of this certain
precautions should be applied when using the switch module.
1260-22 User Manual
ERROR: EXTERNAL
Module Operation 3-11
RESET