71M6543F/H and 71M6543G/GH Data Sheet
Table 81: CE Transfer Variables (with CTs)
CE
Address
Configuration
Name
Description
WSUM_X
W0SUM_X
W1SUM_X
W2SUM_X
VARSUM_X
The signed sum: W0SUM_X+W1SUM_X+W2SUM_X.
0x84
0x85
0x86
0x87
0x88
The sum of Wh samples from each wattmeter
element.
LSBW = 1.0856*10-12 VMAX IMAX Wh.
Figure 32 (page 88)
The signed sum:
VAR0SUM_X+VAR1SUM_X+VAR2SUM_X.
VAR0SUM_X
VAR1SUM_X
VAR2SUM_X
0x89
0x8A
0x8B
The sum of VARh samples from each wattmeter
element.
LSBW = 1.0856*10-12 VMAX IMAX VARh.
WSUM_X and VARSUM_X are the signed sum of Phase-A, Phase-B and Phase-C Wh or VARh values
according to the metering equation specified in the control field EQU[2:0] (I/O RAM 0x2106[7:5]).
WnSUM_X is the Wh value accumulated for phase n in the last accumulation interval and can be computed
based on the specified LSB value.
For example, with VMAX = 600 V and IMAX = 208 A, the LSB for WnSUM_X is 0.135 µWh.
5.4.8.1 Instantaneous Energy Measurement Variables
InSQSUM_X and VnSQSUM are the squared current and voltage samples acquired during the last accumulation
interval. INSQSUM_X can be used for computing the neutral current.
Table 82: CE Energy Measurement Variables (with Shunts)
CE
Name
Description
Configuration
Address
Neutral Current:
I0SQSUM_X
I1SQSUM_X
LSBI = 9.9045*10-13 * IMAX2 A2h (PRE_E=0)
LSBI = 6.1903125*10-14 * IMAX2 A2h (PRE_E=1)
0x8C
0x8D
LSBI = 6.3968*10-13 * (IMAX2) A2h
I2SQSUM_X
I3SQSUM_X
V0SQSUM_X
0x8E
0x8F
0x90
Figure 31 (page 87)
LSBV = 9.4045*10-13*VMAX2 V2h
V1SQSUM_X
V2SQSUM_X
0x91
0x92
Table 83: CE Energy Measurement Variables (with CTs)
Description
CE
Address
Name
Configuration
I0SQSUM_X
I1SQSUM_X
0x8C
0x8D
LSBI = 1.0856*10-12 * (IMAX2) A2h
I2SQSUM_X
I3SQSUM_X
V0SQSUM_X
0x8E
0x8F
0x90
Figure 32 (page 88)
LSBV = 1.0856*10-12 * VMAX2 V2h
V1SQSUM_X
V2SQSUM_X
0x91
0x92
126
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