Do Standby Manual Device Operation; Purpose; Secondary Function; Mounting Locations - Honeywell HPM Service

6 Removal and Replacement

6.6 DO Standby Manual Device Operation

Normal IOP control procedure
Use the procedure in the following table to return to normal IOP control of the FTA field devices.
Step
1
Use the HPM Status display to restore the Checkpoints to the replacement IOP, to
select RUN STATES, and to STARTUP the IOP.
For the IOP's first point that controls the channel 1 output level of the IOP, use the
2
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
3
of the Analog Output Standby Manual device as follows:
(NOTE: the keyswitch access level must be in the SUPERVISORY position or
the ENGINEER's position to perform this function);
Select the slot, then select the slot's "OP", type in a value equal to the current
output from the Standby Manual device for that slot, 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.
4
When the output level for channel 1 matches the output level of the Analog
Output Standby Manual device, place the OUTPUT SOURCE SELECT switch
for channel 1 in the PM position. The IOP will now be controlling channel 1.
Use the point's Detail or Group display to select the Normal mode for the point.
5
6
Repeat steps 2 through 5 for IOP channels 2 through 8.
7
Disconnect the Analog Output Standby Manual device cable from the STANDBY
MANUAL connector on the FTA, if desired.
6.6 DO Standby Manual Device Operation

Purpose

The primary function of the model MU-SMDC02 or model MU-SMDX02 Digital Output Standby
Manual (DOSM) device is to control Digital Output FTAs while the associated Digital Output IOP card
is serviced. Except in the case of the +24 Vdc nonisolated FTA which has no relays, the FTA's relays are
controlled, not their loads.

Secondary function

A secondary function of the Digital Output Standby Manual device is to indicate the state of each IOP
output (LED on = output on). The LEDs indicate the output state of the IOP as soon as the connection is
made.

Mounting locations

The model MU-SMDX02 Digital Output Standby Manual device can be mounted in an HPM cabinet on
an FTA Mounting Channel. The model MU-SMDC02 Digital Output Standby Manual device is mounted
in a carrying case for portable applications.
414 HPM High-Performance Process Manager Service
Honeywell
Action
R688
December 2020