CET Electric Technology
63
Notes:
1) This register represents the Month when it is read. To read the Monthly Energy Log, this register
must be first written to indicate to the PMC-53A which log to load from memory. The range of
this register is from 0 to 12, which represents the Present Month and the Last 12 Months. For
example, if the current month is 2016/10, “0” means 2016/10, “1” means 2016/09, “2” means
2016/08, … and ”12” means “2015/10”.
2) For each Monthly Energy Log, the time stamp shows the exact Self-Read Time (20YY/MM/DD
HH:MM:SS) when the log was recorded. For the Monthly Energy Log of the Present Month, the
time stamp shows the current time of the meter because the Present Month is not yet over.
3) The Monthly Energy Log for the Present Month can be modified, but the Monthly Energy Logs
for the Last 12 Months are Read Only.
5.8 Daily and Monthly Freeze Logs (Optional)
5.8.1 Daily Freeze Log
High-order Byte: Year (0-99)
Low-order Byte: Month (1-12)
High-order Byte: Day (1-31)
Low-order Byte: Hour (0-23)
High-order Byte: Minute (0-59)
Low-order Byte: Second (0-59)
Peak Demand of kvar Total
Table 5-24 Daily Freeze Log
Notes:
1) There is no Log Pointer that indicates the current logging position. Writing a value N between 1
and 60 to the Index register to retrieve the Daily Freeze Log of the N
th
entry. For example, writing
1 to the Index register will retrieve yesterday’s Daily Freeze Log. If N = 0 or N > 60, an exception
response will be returned with the Illegal Data Value error code (0x03) as defined by the Modbus
protocol. If all the returned values of the N
th
Log Record (where 1 ≤ N ≤ 60) are all 0 (including the
timestamp), this indicates that the returned Log Record is invalid and that the end of the Log has
been reached. If the software is reading the Log for the very first time, it should start with N=1 and
stop when either N=60 or when the returned Log Record is invalid. After that, all the software has
to do is to read the Log on a daily basis with N=1.
5.8.2 Monthly Freeze Log
High-order Byte: Year (0-99)
Low-order Byte: Month (1-12)
High-order Byte: Day (1-31)
Low-order Byte: Hour (0-23)
High-order Byte: Minute (0-59)
Low-order Byte: Second (0-59)
See Table 5-26
Demand Data Structure
Peak Demand of kvar Total
Table 5-25 Monthly Freeze Log
To Next Page
Loading...
Need help?
General
