User guide and technical documentation
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2.4.7.2
Analog inputs – AIy.x
These analog inputs on sections 2 and 3 have an accurate measurement of voltage, current or resistance.
The measurement mode must be set for each analog input in the chosen software (see chapter 3) according
to the following table:
The measured value is of the REAL type and corresponds directly to the measured value.
2.4.8
Analog output connection – AO
Analog outputs serve for regulation of external devices (such as three-way valves or heat exchangers) by
output analogue signal in range of either 0–10 V or 0–20 mA.
External device is connected to the terminals AGND and AORx, or AORy.x (see chapter 2.4.8.1) or to the
terminals AGND and AOVx, or AOVy.x (see chapter 2.4.8.2).
The following illustration demonstrates connection of external device (resistive load) to analog output:
2.4.8.1
Analog output – AOR
In addition to the functions of voltage and current output, this analog output also has the option of measuring
resistance up to 2 k
Ω
, so it is suitable for measuring resistance sensors, e.g. PT1000. The output mode must
be set in the chosen software (see chapter 3) according to the following table for each analog output:
The set/measured values are of the REAL type and corresponds directly to the set or measured value.
Settings
Type of measurement
0
Off
1
Voltage 0–10 V
2
Voltage 0–2.5 V
3
Current 0–20 mA
4
Resistance (three-wire conductors)
0–1 960
Ω
5
Resistance (two-wire conductors) 0–100 k
Ω
Settings
Behaviour
0
Voltage output 0–10 V
1
Current output 0–20 mA
3
Resistance measurement 0–2 k
Ω