DFM-400P Rev 2.1 Installation and Appplication Guide Edition 1.6
Page 10 of 14
Object Name
Description
Default Value
AV20
PI4 Total Pulses
Total Pulses (from PI Data tab)
N/A
AV21
Battery Backup Voltage
Current Voltage of Backup
Battery
N/A
AV30
Baud Rate
Network Baud Rate
76,800 bps
Notes
1.
Object Names: The Device object name can be written to and may be up to 64 characters
long. The Pulse Input object names can also be written to and may be up to 16 characters
long. Note that the AV object names are fixed and cannot be changed.
2.
PI Objects: These objects are used to configure each of the four pulsed inputs. Refer to the
PI Object in Chapter 10 (Objects) of the
V3.22 ORCAview Technical Reference Manual
for
further information. The properties of the PI objects in the Pulse Input Field Module are
identical to those in other products with the following important notes:
•
Description Tab: The PI object in the Pulse Input Field Module does not support this.
•
Pulse Duration: The PI object in the Pulse Input Field Module does not support this
property. There is no need when the hardware supports a jumper configurable
debounce.
•
COV: The PI objects each have a COV setting that is used globally for all of its properties
and associated AV objects, but current versions of DCU and DAC firmware do not
support COV data exchange with PI objects. Use the AV objects for data exchange
instead of the PI properties (at least until V3.23).
3.
AV Objects: These are mapped internally to specific PI properties, as indicated in the list on
the previous page, for integrating with other vendors in a multi-vendor installation and
support COV data exchange.
Operation
The Pulse Input Field Module measures time and counts in-coming pulses. All the associated
values and statistics are then derived from these two basic functions.
Time Clock
The Pulse Input Field Module does not have a real time clock, but it does have an on-board
software clock. This means that time is only kept while the module is running, but is very
accurate. Time is lost whenever power is cycled on the device, and will be initialized to
‘Delta default time’. Time will of course be updated over the network from a device that is
configured as a Time Master.
