15P0059B3 DCREG2
USER MANUAL DCREG4
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3.36 MILLIAMPERE INPUT / OUTPUT SIGNALS
It is possible to feed an analog input as an mA signal to terminals 5 / 7 (REF) or terminals 11 / 13 (IN
1): if current enters terminal 5 and goes out from terminal 7, or if current enters terminal 11 and goes out
from terminal 13, the internally generated signal is positive by default.
Similarly, it is possible to obtain an analog output as an mA signal from terminal 8 (OUT 1) or terminal
10 (OUT 2): said signal, that may be only outgoing towards 0V, is obtained by an internally generated
signal which is positive by default.
1. INPUT SIGNALS
Between signal I
in
in mA, which is externally applied, and signal V
RL
in Volt, which is internally generated in
the load resistance terminals, the following relation is applied:
I
in
=20mA V
RL
=4V
The Gain and Bias functions (and the Polarity and Reverse following functions) may be applied to signal
V
RL
before generating the TermRef reference displayed by parameter M014 (or signal AnIn1 displayed by
parameter M010), according to the formula below:
With the default values of the relevant parameters, the final matching between I
in
and TermRef(AnIn1) is
the following:
I
in
=0mA TermRef(AnIn1)=0V
I
in
=4mA TermRef(AnIn1)=0.8V
I
in
=20mA TermRef(AnIn1)=4V
The table below shows the values to be assigned to the different parameters relating to the Gain and Bias
functions in order to obtain a given percentage of internal reference TermRef(AnIn1), with 100%
corresponding to 10V, starting from external signal I
in
in mA. The table assumes that the parameters
relating to the Polarity function (parameter P120 and P126) are at their default value and that the Reverse
function is not applied.
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