Operation: CP1SD/T/L Version
CENTRON® Polyphase Meter Technical Reference Guide
53
Load Profile
Load Profile (mass memory) data is stored in blocks (records) of 128 intervals. The profile
interval length is the same for all channels and is independent of the interval length for
demand quantities. Each interval of load profile data is identified by date and time. Each
interval contains status bits indicating the occurrence of outages, Test Mode, and other
significant events or errors. Refer to the PC-PRO+ Advanced online help for a list of Load
Profile Status Codes. Register readings are also stored for each channel for data validation.
The Load Profile functionality is designed for use in billing and load research applications
where multi-channel high resolution data is needed.
Load Profile Specifications
Capacity
The load profile option is available in 144 kBytes of memory. The amount of memory
actually used for load profile recording is programmable in 1 kByte increments. There are
up to 8 channels available for interval load profile data.
Bit Resolution
The load profile operates with 16-bit data resolution. Equivalent pulse count resolution is as
follows:
Bits
Pulse Counts
16 65,535
15
1
32,767
1 When a Net quantity (i.e., Net Wh) is chosen as a load profile channel, all load profile channels have
15-bit data resolution.
There is a difference between MV-90 and the D/T/L Register concerning load profile
data. The D/T/L Register can accommodate a maximum of 65,535 pulses (16 bit) per
interval. (A maximum of 32,767 pulses per interval is allowed when using bidirectional
quantities because the 16th bit is used for "+" or "-"). MV-90 is a 16 bit system,
however the 16th bit is always used for "+" or "-". Since the 16th bit is always signed,
the maximum allowed pulses per interval is always 32,767. If MV-90 receives a number
of pulses per interval larger than 32,767, MV-90 will record a negative number
(received value) for that interval.
Itron recommends programming any D/T/L Register with load profile that is
interrogated by MV-90 or any system that exports load profile information to MV-90 to
use 15 bit resolution or 32,767 pulses per interval.
