6 Removal and Replacement
6.6 DO Standby Manual Device Operation
R688 HPM High-Performance Process Manager Service 417
December 2020 Honeywell
If you want to use the Digital Output Standby Manual device to hold the current FTA
output states while servicing the associated Digital Output IOP, set the 16 output
switches equal to the output state that is displayed by the LEDs on the Digital Output
Standby Manual device and perform Steps 5 through 7 below. You can also set any of
the 16 output switches to an alternate state, if desired.
Place the ENABLE STANDBY switch on the Digital Output Standby Manual device in
the ON position.
Toggle the momentary ACTIVE STANDBY switch on the Digital Output Standby
Manual device. The STANDBY ACTIVATED LED should illuminate. This allows the
Digital Output Standby Manual device's switch settings to control the Digital Output
FTA and also send a status signal to the IOP to indicate that the connected Digital
Output Standby Manual device is armed and possibly controlling FTA outputs.
While the Digital Output Standby Manual device is controlling outputs, the IOP can be
placed in the idle mode or removed/replaced for servicing, and the FTA outputs will be
held by the Digital Output Standby Manual device. After servicing the IOP, proceed to
the Normal IOP Control procedure to restart the IOP.
ATTENTION
While the Digital Output Standby Manual device and the FTA’s associated IOP are both
present and controlling outputs (they are connected in parallel to the FTA), either can
override an “off” output from the other, but not an “on” output. Until the IOP is removed
or reset, the Digital Output Standby Manual device’s output LEDs indicate the resultant
outputs actually delivered to the FTA’s switching elements.
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