Xylem Expert 7060_7070_Modbus - Manual (Page 26)

Communication protocol Serie30
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6.3.2 Analogue Output
The analogue output has to transfer the error states described in the former chapter and therefore additional analogue states
were introduced. The graph below shows the transfer function between pressure ( in this example the analogue output is a
function of P – however it could also be some other mathematical function using CH0). The black line showes the transfer
function for a positive DAC-gain. The Sig
error
is independent of any scaling function and represents a internal error state (see
table above).
The following table shows possible analogue values for different hardware types:
0-10 V 0-2.5 V 4-20 mA Dig. represantive
Sig
error
11.6 V 2.9 V 22.5 mA NaN
Sig
ovl
11 V 2.75 V 21.8 mA +Inf
Sig
max
10 V 2.5 V 20 mA value
Sig
min
0 V 0 V 4 mA value
Sig
uvl
-1 V -0.3 V 3.3 mA -Inf