Commissioning
EL3692
106
Version: 2.1
• as 32-bit integer measuring range-dependent value, with 24-bit content
"fixpoint"
Explanation:
Each of the 9 measuring ranges of the EL3692 extends over 1 decade (e.g. 1 .. 10 Ω). The regular
value range of
value
extends from x0 .. x00 7F FF FF for each measuring range with "x00 7F FF FF ≈
full-scale value".
In Autorange mode the measuring range is exceeded by up to 10%, in order to ensure the measuring
range changeover; referred to as extended measuring range.
Note the status information.
The following example is for the measuring range 1 .. 10 Ω:
Input resistance
32-bit value
Interpretation
Status bits
0 Ω
x00 00 00 00
0
Extended Range = 0
Overrange = 0
10 Ω
x00 7F FF FF
8.388.607
extended range = 1 "extended measuring
range"
Overrange = 0
10 .. 11 Ω
Extended Range = 1
Overrange = 0
> 11 Ω
x00 8C CC CB
9.227.467
Extended Range = 0
Overrange = 1
Please note that that the
relative
measuring error is very large near the lower end of the measuring range.
For measurements within the range of less than 10% of the lower end of the measuring range the next lower
measuring range should be used. The AutoRange function works accordingly.
• as 32-bit fixed-point float-value with mantissa and exponent, measuring range-independent
"float"
Explanation:
This 32-bit variable can be linked directly with a FLOAT variable of the PLC according to IEC61131.
The conversion takes place in the EL3692; no measuring range-dependent conversion by the user is
required.
See additional information on page
Process data [
}
111]
6. You have to check the correct operation of the range change function in the autorange opration mode for
all test specimens. This is mandatory in the special case, if test specimens with very different resistance/
capacity/inductive values are connected to channel 1 and 2 (> 3 measuring ranges). An unoccupied channel
will measure in the measuring range 7 (1 MΩ .. 10 MΩ).
This can be compensated channel-wise by the extension of the delay time (CoE
0x80n0:31 [
}
136]
), if the
automatic setting is not sufficient. The delay time should be increased stepwise for the channel, which has
not the optimal range setting.
7. During the operation, the channel-wise process data value has to be verified by checking of the state
variables
Error, DataInvalid
and
SteadyState
.
For further configuration in TwinCAT please refer to sections
Process data [
}
111]
and
Important CoE entries
[
}
132]
.
5.5
Operating behavior, diagnostics
The following section describes certain aspects of the EL3692 operating behavior.
5.5.1
Control
The EL3692 is either controlled via the
CoE settings
or via the
control word
in the output process image.
