Instructions for Use
– SCHMIDT
®
LED Measured Value Display MD 10.010
Page 8
Analog output
The analog output of the
MD 10.010
is galvanically isolated from its own
energy supply and the sensor supply (pin 13:
Analog Out+
; pin 12:
Analog
Out
–
≙
AGND; see Figure 2).
When using the display version with DC supply (24 V), the mass of the
analog output (AGND) can be connected to that of the operating voltage
(GND). However, the galvanic isolation is lost and a possible mass offset
in the connecting cable can lead to a distortion of the output signal.
When using the display version with AC supply, the analog output must
not be in contact with the supply voltage under any circumstances.
The load resistance R
L
has to be connected to AGND:
Current mode:
R
L
≤ 400
Voltage mode:
R
L
≥ 1 k
In the configuration menu, beginning of signalization range without (0 mA
or 0 V) or with offset (signal transmitting zero point: 4 mA) can be selected.
5 Signalizations
Main display
Initially, the main display (see Figure 4) shows the status of the device:
Main display State
Initialization of measured value display
Duration approx. 5 s (after switch-on of supply voltage)
Key lock activated
Error message from sensor
Flashing
Displayable range exceeded or undercut
Table 2 Initial status reports
Analog output
If the connected sensor indicates an error, the analog output of the display
MD 10.010
will also signal an error:
Signal area without offset (0 ... 20 mA / 0 ... 10 V):
In current mode the interface outputs 0 mA.
In voltage mode the output switches to 0 V.
Signal area with offset (4 ... 20 mA):
The interface outputs 2 mA.
