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Installation and Operations Guide
Backup mode sequence of operation
VLX/VLX-Platinum: saving and restoring configuration and setup data
66
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ACM-VLX/VLX/EXP/AXM
In backup mode, all EXP/AXM outputs are set to backup mode values. These
values are programmed using AVs (see "Setting backup mode values for AOs
and BOs" on page 56) and are stored in nonvolatile EXP/AXM memory. While
in backup mode, the Status LED on the EXP/AXM enters pulse flash mode: 0.5
seconds ON, 2.5 seconds OFF (see "EXP/AXM Status LED" on page 64).
Once an EXP/AXM enters backup mode, it remains in backup mode for a
minimum of five minutes. After the five-minute period, on first receipt of a
message from the VLX/ACM-VLX, the EXP/AXM resumes normal operation.
You can manually return an EXP/AXM to normal operation by cycling
EXP/AXM power while VLX/ACM-VLX communication is present.
The EXP/AXM enters backup mode under the following conditions.
Lost communications
Power reset and no
communications
See the ACM Installation and Operations Guide for the data retention
Note
processes for the ACM.
Any time you change configuration settings, automation features, or DDC, save
this data to the Compass operator workstation. Configuration AVs are stored in
battery-backed non-volatile memory, and DDC and automation features are
stored in flash memory. However, saving this data to the operator workstation
lets you quickly restore settings after a catastrophic failure that requires you to
completely reprogram the controller.
See Compass Help for information about sending and saving controller data.
© Honeywell. All Rights Reserved. LT-VLXEXPAXMIOG Rev. 01
The EXP/AXM loses VLX/ACM-VLX
communication for more than five minutes. Unless
overridden by H-O-A switch, outputs remain in their
last commanded state for the five-minute period
until backup mode activates. Then outputs are set to
backup mode AVs. When communication is re-
established, outputs are immediately commanded to
AO or BO present-value.
The EXP/AXM detects no VLX/ACM-VLX
communications for one minute immediately after a
power reset. Unless overridden by H-O-A switch,
outputs remain 0/OFF for the one-minute period
until backup mode activates. If the power off period
is a short enough duration (approx. 5-10 seconds)
for the EXP/AXM to retain last commanded values,
not all power is dissipated, and outputs will remain
at last commanded values for the one-minute period
until backup mode activates. Then outputs are
commanded to backup mode AVs. When
communication is re-established, outputs are
immediately commanded to AO present-value.
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