Honeywell ALERTON ACM-AXM - Special Points in DDC Programming

Installation and Operations Guide
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VLX/ACM-VLX data, DDC, and automation
© Honeywell. All Rights Reserved. LT-VLXEXPAXMIOG Rev. 01
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The property shows the execution rate of DDC in milliseconds and the number
of memory bytes DDC occupies. If DDC halts, this property returns a text string
indicating the condition that caused the halt.
Other properties of the Program 1024 object may be useful as well. See
“Properties of VLX/ACM-VLX Program objects” on page 93.
Special points in DDC programming
Figure 26 The Ale rton Diagnostic (513) prope rty shows DDC exe cution time
and byte s occupie d by DDC
Branch points Used for temporary storage of values in a DDC routine.
Not available for display or as BACnet objects and
properties. Total of 128 (BR-0 through BR-127) available
when using global/building controller DDC. Total of
2048 (BR-0 through BR-2047) available when using
VisualLogic.
Initialize Flag that is ON only during the first pass of DDC. Use
Data Type 8 - Other.
Current time Provides a count of minutes since midnight. 0 = midnight.
1339 = 11:59 p.m. Use Data Type 8 - Other.
MS/TP dev cnt Provides a count of the devices currently communicating
on the VLXs/ACM-VLXs MS/TP LAN.
NOTE: VLX and ACM have dedicated diagnostic
screens for MS/TP device counts. Use the Alerton/
Standard templates.