4 Configuring the device
4.2 MODBUS register
NZM-XMC Measuring and Communication Module
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4.2.7 Mean value over time window (Max. Demand)
Parameter No. 35 (max. demand) is configured here; any other parameter is
assigned for this purpose. The selected value of this parameter is sampled at
short time intervals within the time window, and the average value of the
sampled values is calculated.
The mean value is a moving average formed only from the discrete values
determined in the selected period. If, for example, a period of 60 minutes is
selected, the mean value applies to the last 60 minutes.
Registers 1250 and 1251 define the behavior of the measuring device for the
max. demand setting:
•
The code of the parameter to be monitored must be entered in register
1250.
•
The window time is specified, in minutes, in register 1251.
4.2.7.1 Overview of Modbus coils
Table 11: Modbus coils
Register
Variable
Range
1250
Parameter code
0: no maximum setting
X: Parameter code (1 - 48)
1251
Time window (the period in which the max.
demand must be determined)
1 - 60 minutes
Variable
Coil
Part no.
Function
code
Digital outputs
0 - 9
R/W
1; 5
Digital inputs
10 - 19
R
1
Restart the whole device
1)
2000
W
5
Delete power values
2100
W
5
Initialize max. demand
2101
W
5
Delete maximum and minimum values
2102
W
5
Delete power (max./min., demand value)
2103
W
5
Delete maximum acceptance value
2104
W
5
1) = acceptance of a new configuration