USER MANUAL 1.2 | B-FORTIS CC-PRIME SERIES
Berghof Automation GmbH | Arbachtalstrasse 26 | 72800 Eningen | www.berghof-automation.com
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Temperature measurement AI (T)
Fig. 15: example connection: temperature measurement
Item
Description
1
PT 100 with 2-wire connection
2
PT 100 with 3-wire connection
Only use the corresponding AGND for each power input.
Do not connect AGNDs from different channels.
Only use one channel per function: either AI (U) or AI (I).
Do not connect to the common GND. The required connections can already be found on the
circuit board.
Cables to the PT100(0) sensors should be connected as directly as possible (avoid the use
of terminals and terminal blocks).
Only connect PT100(0) sensors to AI (U/T) channels. Each 14-pin plug-in connector has
2 AI (U/T) channels.
2-wire measurement
Resistance can result in a measurement error, which in the case of long cables with a small
cross-section can be up to 10°. If the temperature of the sensor is known, this deviation can be
subtracted and this way compensated through the software (alternatively, use 3-wire
measurement).
3-wire measurement
The nearest AI (U) connection is used to compensate the resistance in the cable. It can only be
used directly in conjunction with the following AI (U/T) channel.
