Introduction to SICAM P power meter modbus communication message analysis

Taking the P38 instrument as an example, set the PT transformation ratio of 100 and the CT transformation ratio of 20, and the analysis of its communication message is introduced as follows. 

Analog (function code 03H) 

1) Input phase A voltage 57.7 V, 0 degrees. Phase A current 1A,-30 degrees. 

Send: 07 03 10 00 00 28 41 72 

Received: 07 03 50 

16 92 00 00 00 00 07 86 (phase voltage) 

16 92 00 00 16 92 OF OC (线电压) 

03 E9 00 00 00 00 01 4D (current) 

03 E9 

00 32 00 00 00 00 00 32 (active power) 

00 1C 00 00 00 00 00 1C (无功功率) 

00 39 00 00 00 00 00 39 (visible power) 

03 62 03 E8 03 E8 03 62 (power factor) 

13 86 (Frequency) 

75  30  75  30  00  1F  00  12  00  24

01  2B  00  00  00  00  02  72  00  00

8829

Resolution: 

1692H = 5778D, phase A voltage, the default coefficient is 0.01, and the phase A voltage is 57.78 V. 

03E9H = 1001D, phase A current, the default coefficient is 0.001, and the phase A current is 1.001 A, 

0032H = 50D, total active power, default coefficient 1, total active power is 50w, 

001CH = 28D, total reactive power, the default coefficient is 1, and the total reactive power is 28Var. 

0039H = 57D, total apparent power, default coefficient 1, total apparent 57VA 

0362H = 866D, total power factor, default factor 0.001, total power factor 0.866. 

1386H = 4998D, frequency, default coefficient 0.01, resulting in a frequency of 49.98 Hz. 

Multiply these quadratic values by the corresponding transformation ratios to get the corresponding primary values. 

2) Input phase A voltage 57.7 V, 0 degrees. Phase A current 1A, 150 degrees. 

Send: 07 03 10 00 00 28 41 72 

Received: 07 03 50 

16 92 00 00 00 00 07 86 16 92 00 00 16 92 OF OC 03 EA 00 00 00 00 01 4E 03 

EA FF CE 00 00 00 00 FF CE FF E4 00 00 00 00 FF E4 FF C7 00 00 00 00 FF C7 

FC 9E 03 E8 03 E8 FC 9E 13 86 75 30 75 30 00 00 00 00 00 00 08 33 00 00 00 

00 00 00 00 00 

9B C3

Resolution: Power and power factor are negative values. 

FF CEH, because it is in the form of complement, is actually-50, so the active power is-50w 

FC9EH, because it is in the form of complement, is actually-866, so the power factor is-0.866 

Electrometric (function code 03H) 

Send: 07 03 20 06 00 02 2F AC 

Received: 07 03 04 00 00 02 12 1D 5E 

Resolution: 

00000212H = 530D, forward total active power, default coefficient 0.1 wh, obtain 53wh, multiply by PT, CT changes 

Ratio, getting 116kWh.