ZIEHL-ABEGG CXE/AV, Operating Instructions Manual, Page: 14 / 121

Shielding
The use of shielded cables is normally not needed but offers high protection against electromagnetic
interferences, especially high frequencies. However, the effectiveness of the shield depends on care-
ful installation of the line.
If shielded cables are used, the shield should be placed at
“ PE ” on at least one side (preferably on the
master connection). The occurrence of compensating currents may have to be considered if the shield
is contacted on both sides.
Shield connection correct Shield connection incorrect
Information
If any matters are unclear, please contact our V-STE support department for control systems -
ventilation technology. The information sheet "Network structure of MODBUS" R-TIL08_01 contains
detailed information about "MODBUS".
5.10 Addressing member MODBUS Master Interface
Up to 32 members can be connected at the MODBUS Master interface.
No other components are required for the patented automatic addressing (activation see menu group
MODBUS Master: Auto Addressing). Only the connections
“ ID1 ” and “ ID2 ” of the Slave members are
connected additionally next to the bus connection and at the “ ID ” connection of the MODBUS Master
for this.
The
“ ID ” connection of the MODBUS Master must be connected to the “ ID1 ” or “ ID2 ” connection of the
fi rst Slave member . This is recognised as a result and occupied by address 1 .
For the following users the connection “ ID1 ” or “ ID2 ” of a Slave user respectively is connected with
connection “ ID1 ” or “ ID2 ” of the next Slave user.
The automatic addressing of other users is initiated by the previous user via this connection.
The individual members can be addressed in advance without this device by an external terminal or a
PC.
Alternatively, manual addressing with free assignment of the address is possible (see Manual
addressing).
Information
•
If a repeater is necessary and automatic addressing should be carried out, only the repeater of the
Z-G-1NE type can be used, only it can relay the addressing signal.
•
Depending on the version, the connections for MODBUS “ A (D+) ” , “ B (D-) ” are available single or
double at the Slave members. These are connected with each other internally electrically.
•
The connections for the automatic addressing “ ID1 ” and “ ID2 ” are not directly connected with each
other internally. These may not be bridged; any order of connection is possible.
•
When using the connection box the cable shield of the CAT5 cable is internally connected to “ PE ” by
an RC element.
•
The communication parameters are fi xed preset, see programming menu group MODBUS Master.
Operating Instructions UNIcon MODBUS Master Electrical installation
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