MODBUS System Set Up
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An illegal data address exception will be returned to queries beginning at unused addresses,
40005 - 41010, 41088 - 42010, and 42167 - 99999.
Only one accumulator or counter can be polled at a time.
Table 17. Analog Accumulator Holding Register Addresses
Accumulator
Value
# Samples
Sample Rate
1
41011 - 41013
41014 - 41016
41017
2
41021 - 41023
41024 - 41026
41027
3
41031 - 41033
41034 - 41036
41037
4
41041 - 41043
41044 - 41046
41047
5
41051 - 41053
41054 - 41056
41057
6
41061 - 41063
41064 - 41066
41067
7
41071 - 41073
41074 - 41076
41077
8
41081 - 41083
41084 - 41086
41087
Table 17 shows the MODBUS holding register addresses used for analog input accumulators.
The average value of the accumulator and the total accumulated value - scaled to real world
units - can be calculated with the formulas presented below. An example will follow to help
clarify things, but first, some definitions.
Values to be calculated are:
A
= Average analog input value scaled to real world units.
T
= Total accumulated value, scaled to real world units.
P
= The time period, in seconds, that the accumulator has been running.
Values returned when the accumulator is read are:
V
= Accumulator value, unscaled.
N
= Accumulator number of samples.
R
= Sample rate
Values that are dependent on the sensor being used are:
M
L
= lowest real world value measured by the sensor.
M
H
= highest real world value measured by the sensor.
S
L
= sensor output corresponding to ML - in Volts or mA.
S
H
= sensor output corresponding to MH - in Volts or mA.
I
= analog input range - 5 Volts or 20mA depending on the type of sensor.
The formula for calculating the average analog input value in real world units is:
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