User manual

Operating Instructions OPUS20E For external sensors
8
EN
No sensor assignment is pre-set during initial commissioning at the factory. In
the case of subsequent configurations, the last pre-set specification is assigned.
By holding down the mode selection key, you can now switch to the configuration
menu for the analog sensor specification.
Press the mode selection key repeatedly until the desired sensor specification
is displayed. Finally, confirm the desired sensor specification by holding down
the mode selection key.
Once the sensor has been logged on, a message indicating the selected
sensor configuration is also shown for your information – the message
symbol flashes in the lower right corner of the display. You can close
this message display by briefly pressing the mode selection key.
Sample LCD displays: Sensor specification for logging on an analog
sensor to the first input channel (AN0):
Selection to specify no sensor assignment
o
n the first input channel.
Status display showing that no sensor is
l
ogged on to the first input channel.
Selection of a voltage measurement
sensor 0 - 1 V.
Status display showing that a voltage
measurement sensor 0 - 1 V is logged on
to the first input channel.
Selection of a current measurement
sensor using the 2-wire technique.
Status display showing that a current
measuring sensor using the 2-wire tech-
nique is logged on to the first input channel.
Selection of a current measurement
sensor using the 3-wire technique.
Status display showing that a current
measuring sensor using the 3-wire tech-
nique is logged on to the first input channel.
Selection of a Pt100 sensor using the
3-wire technique.
Status display showing that a Pt100
sensor using the 3-wire technique is
logged on to the first input channel.
8. Measurement Value Display and
Data Logging
8.1. Channel Groups and Measurement Channels
Each measurement variable captured by a connected sensor - in the defined
unit of measurement - represents one channel group.
For example, a temperature sensor with defined units of measurement in °C or
°F represents two channel groups (temperature in °C and temperature in °F).
The number of channel groups which a BUS sensor can measure depends on
the sensor type. For example, the type TFF BUS sensor can measure seven dif-
ferent channel groups.
Analog sensors for measuring voltage or current can only measure one channel
group; analog sensors for measuring temperature can measure two channel
groups (°C and °F).
Again, four measurement channels are available for each channel group for the
purpose of data logging: current measurement (curr), minimum measurement
(min), maximum measurement (max) and mean measurement (mean).
With full sensor assignment and a total of four connected type TFF BUS sensors
and two connected analog Pt100 sensors, the data logger is capable of capturing
measurements from a total of 32 channel groups and 128 measurement chan-
nels, as shown in Table 1.
S
election of a Pt100 sensor using the
4-wire technique.
S
tatus display showing that a Pt100
sensor using the 4-wire technique is
l
ogged on to the first input channel.
Selection of a type K thermocouple. Status display showing that a type K
t
hermocouple is logged on to the first
input channel.
S
election of a type J thermocouple
on the first input channel.
S
tatus display showing that a type J
thermocouple is logged on to the first
i
nput channel.
Selection of a type S thermocouple
on the first input channel.
Status display showing that a type S
thermocouple is logged on to the first
input channel.