Emergency Reset Feature; Interface; Normal State Of External Switch; Scope Of Reset Event - Racal Instruments 1260-22 User Manual

Publication No. 980673-055 Rev. A
Emergency Reset
Feature

Interface

Normal State of
External Switch
Scope of Reset
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To enhance safety in applications that involve power switching, the
1260-22 offers an emergency reset function, activated by an
external input. This function instantly opens all relays in response
to an external event. This is a hardware operation that does not
require intervention on the part of the Option-01T or application
software.
When using the emergency reset feature, exercise due
caution if any undesirable effects may result from opening
all channels.
The 1260-22 reset inputs are located at pins 29 and 30 of
connector J202 on the front panel. You may connect this to an
external device such as a mechanical switch. When the switch is
closed, all relays on the plug-in or module are immediately opened.
If desired, a jumper may be added to the 1260-22 to accommodate
an active "open" external switch. Active "closed" is the default.
If you prefer to use an active "open" switch, add a shunt jumper to
the header designated as JP2 on the 1260-22 printed circuit board
(see Figure 3-3).
The emergency reset inputs (J202 pins 29 and 30) must be
inactive during initialization of the VXIbus system. If the
emergency reset is configured for normally-open operation
(reset occurs when reset pins are connected together), then
the pins must not be connected together during system
initialization. Otherwise, the slot 0 controller will not detect
the presence of the Option-01T that controls the 1260-22
module.
Similarly, if the emergency reset is configured for normally-
closed operation (reset occurs when reset pins are not
connected together), then the reset pins must be connected
together during system initialization. The reset pins must not
call for a reset condition while the system is being initialized.
The 1260-22 design allows the scope of an emergency reset to be
configured. In the default configuration, the 1260-22 opens only its
own relays in response to an external reset event. If desired, a
1260-22 User Manual
CAUTION:
NOTE:
Module Operation 3-9