6 Removal and Replacement
6.5 AO Standby Manual Device Operation
R688 HPM High-Performance Process Manager Service 411
December 2020 Honeywell
Standby Manual device control procedure
Use the HPM Status display to save the Checkpoint for the IOP, and then use the procedure in the
following table to provide Standby Manual device control of the FTA field devices.
For the first output, press the BAL switch and note the IOP’s output value.
Release the BAL switch and adjust the VALVE knob to make the output of the Analog
Output Standby Manual device equal to the output of the IOP.
Place the mode switch for this output in the MAN position.
Repeat steps 1 through 3 for all remaining outputs from the IOP.
Remove and replace the IOP or switching module, as appropriate, and proceed to the
Normal IOP Control procedure.
Normal IOP control procedure
Use the procedure in the following table to return to normal IOP control of the FTA field devices.
Use the HPM Status display to restore the Checkpoint to the replacement IOP, to select
RUN STATES, and to STARTUP the IOP.
For the first point controlling the output of the IOP, use the point’s Detail or Group display to
place the point in the Manual mode.
Use the IOP’s slot summary display to adjust the first IOP output to match that of
the Analog Output Standby Manual device as follows:
(NOTE: the keyswitch access level must be in the SUPERVISORY position or the
ENGINEER position to perform this function);
Select the slot, and then select the slot’s “OP”. Type in a value equal to the current
output from the Standby Manual device for that slot, and then press the ENTER
key.
This allows the IOP to regain FTA output control and provide the same output level,
if so desired, that existed before the Analog Output Standby Manual device
established control.
On the Analog Output Standby Manual device, change the mode switch for this output to
the position opposite the MAN position.
Use the point’s Detail or Group display to select the Normal mode for the point.
Repeat steps 2 through 5 for all remaining outputs from the IOP.
Disconnect the Analog Output Standby Manual device cable from the STANDBY MANUAL
connector on the FTA, if desired.
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