Siemens 7MC3040-..., Operating Manual, Page: 38 / 116

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Operating manual PA
30
Digital inputs
If you want to use the digital output as an input, you must first manually
deactivate the digital output and configure the following parameters:

Select a current output range (either 0
– 20 mA or 4 – 20 mA) for
Ao1/Ao2

Delete the temperature readings in Min/Max or DoubleMax

Define whether the laser will event-triggered. This only applies to
models with built-in laser.
Analogue input for emissivity correction or ambient temperature
compensation
When desired, current output 2 (Pin 3) can function as a voltage input.
Target object emissivity can be configured from another remote device.
Alternatively, the input signal can be used to define the temperature of
reflected radiation from surroundings for the ambient temperature com-
pensation function.
First, manually deactivate current output 2. Then select one of these two
correction functions at configuration layer
C010
using parameter
AI.FN.
When this is activated, it will not be possible to configure the emissivity
setting or the ambient temperature compensation using the rear panel
buttons, nor will you be able to change the settings from your PC. The
pyrometer display will alternate between showing the currently used val-
ue and showing
EXT
to indicate that these parameters were set from an
external source.
Define the upper and lower voltage values using parameter
AI.U
. Set
the input variables using parameter
AI.V
.
Example for setting emissivity:
AI.U1
= 0 V
AI.U2
= 10 V
AI.V1
= 0 (Epsilon 0 %)
AI.V2
= 100 (Epsilon 100 %)
Example for configuring the ambient temperature compensation function:
AI.U1
= 2 V
AI.U2
= 10 V
AI.V1
= 700 (temperature 700 °C)