DL200X operating manual for external sensors
7
EN
b
Important: If several sensors are used, each sensor must first
be individually connected to the data logger, registered and as-
signed a BUS ID in this manner. The registration process cannot be carried
out if more than one sensor is connected to the BUS !
Thus, ensure that only the applicable sensor is connected
to the BUS for registration.
This restriction only applies for the registration process. After all sensors
have been individually registered, it is possible to use several BUS sensors
without difficulty, of course.
Otherwise, the BUS sensors can be configured directly
in the SmartGraph software.
Further detailed information about configuration of the BUS sensors in the
software is provided in the software manual which you can open by using
the help function of the SmartGraph software.
7.1.3 Logging the BUS sensors (M7x) off
To log off a registered BUS sensor from the data logger again, use the mode
selection button to navigate to the configuration mode M7x. The option for re-
moving the first BUS sensor is shown on the display.
To log off, it is not necessary to connect the sensor to the device!
If several BUS sensors had already been connected and a BUS sensor which is
not the first is to be removed, press the mode selection button until the BUS ID
shows the sensor to be removed.
Briefly pressing the mode selection button now starts BUS sensor log off. After
sensor log off, a message is displayed with information about the BUS ID – the
message symbol in the bottom right corner of the display flashes. Briefly press -
ing the mode selection button closes the message.
7.2 Connection of analogue sensors
The data logger has a 10-pin terminal with two independent input channels for
connecting up to two analogue sensors. Input channel 1 has pins 1, 3, 5, 7 and
9 while input channel 2 has pins 2, 4, 6, 8 and 10 (see
������
, chapter 3).
Both of the input channels support the sensor configurations listed in
the following subchapters.
Example display: Registration function
M61 selection for registering the first
BUS sensor (n1).
Example display: Message specifying
the BUS ID (71.01) for the first registered
BUS sensor.
Example display: Log off function M70
selection for logging off the first selected
sensor.
Example display: Message specifying
the BUS ID (71.01) for the logged off
BUS sensor.
7.2.1 Sensors for measuring voltage 0 - 1V
The sources of voltage are connected with the positive pole at terminal B and
with the negative pole at terminal A, as shown in the diagram:
Important: The voltage input is a real difference input.
If the sensor is connected to the data logger via cables which are
too long, it might be necessary to connect the sensor via shielded cabling.
The cable shield should be connected to the GND terminal.
To register and configure sensors for measuring voltage at the data logger,
follow the instructions in chapter 7.3.
7.2.2 Sensors for measuring current, 2-cable 4 - 20 mA
and 3-cable 0 - 20 mA
The switching supports current measurement in 2-cable and 3-cable operation.
For 2-cable operation, sensor supply and supply for the DL200X must have
identical reference potential. In 2-cable and 3-cable operation, the sensor
current is fed into the A0/A1 terminal.
Wiring diagram for measuring current in 2-cable operation:
The sensor current is converted into voltage in the DL200X at a load. The load
has a resistance of <50 Ω. Both the sensor and the DL200X can be supplied via
an external source of voltage.
Wiring diagram for measuring current in 3-cable operation:
This switching is used for sensors whose own current usage is over 4 mA, such
as gas sensors for example.
To register and configure sensors for measuring current at the data logger,
follow the instructions in chapter 7.3.
Ri
+
-
Sensor
B0 / B1
A0 / A1
GND
Sensor: 4 … 20 mA
External power supply
A0 / A1
+24V
Sensor
GND
Sensor: 0/4 … 20 mA
External power supply
A0 / A1
+24V
Sensor
