Yokogawa PR300 Power and Energy Meter - Manual (Page 49)

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<Toc> <Ind> <3. Procedures for Setting PR300 Functions>
IM 77C01E01-10E
3.6 Writing Energy Values
3.6.1 Active Energy
[Procedure]
(1) Write an active energy value to the two D registers in the table below. The data type is
integer.
(2) After writing that value, write 1 to the writing status register, D0373.
D Register
D0371
Reference No.
40371
H No.
0172
Description
Active energy-setpoint
(lower 2 bytes)
Effective Range
Refer to the "NOTE" below.
D0372 40372 0173
Active energy-setpoint
(upper 2 bytes)
D0373 40373 0174
Active energy value writing
status If other than 1: Invalid
If 1: Writing is executed
[Example]
To set the active energy value to 10,000,000 kWh:
For station number 01, use PC link communication (without checksum) and the random
write command as shown below:
If 10,000,000 is converted into a hexadecimal value, the value is 0098 9680. Then the
order of the upper two bytes and the lower two bytes is reversed
⇒
9680 0098.
[Command]
[STX] 01010WRW03D0371, 9680, D0372, 0098, D0373, 0001 [ETX] [CR]
[Response]
[STX] 0101OK [ETX] [CR]
NOTE
The set active energy value range of the PR300 changes depending on the values of the
VT and CT ratios. The table below shows the set value range.
[Secondary Rated Power] ϫ [VT Ratio] ϫ [CT Ratio]
Less than 100 kW
100 kW to less than 1 MW
1 MW to less than 10 MW
10 MW or greater
Possible Set Value Range
0 to 99999 kWh
0 to 999999 kWh
0 to 9999999 kWh
0 to 99999999 kWh
NOTE
The secondary rated power of the PR300 changes depending on its model and suffix
codes.