Connection Of Electrical Bus Lines; Connection Of Power Supply - Belden HIRSCHMANN OZD Modbus Plus G12 Manuel

3 Start-Up

3.4 Connection of electrical bus lines

Only use approved shielded twisted pair cable for
Modbus Plus bus wiring, e.g., Modicom "Super
Cable", FT4, FT6.
The electrical Modbus Plus interface (Port 1) is a
9-pole Sub-D connector (female).
The pin assignment complies with the Modbus Plus
Standard.
A line which is fitted with 9-pole Sub-D connectors
Shield / 1
Data / 2
Data / 3
n.c. / 4
n.c. / 5
Fig. 11: Port 1 - assignment of Sub-D connector
z
Warning!
The shielding of the Sub-D connector is made of
metal to ensure safe ground current conduction and
must therefore be conductively connected to the
shielding plate of the connector attached to the
cable.
Modbus Plus bus lines must not be used to connect
Modbus Plus repeaters to system components to
which a different ground potential is being applied.

3.5 Connection of power supply

The Modbus Plus repeater should only be supplied
with a regulated safety extra-low voltage to IEC 950/
EN 60 950 / VDE 0805 of +24 V to max. +48 V +10%.
To enhance operational reliability, a redundant supply
from various sources is provided. The operating
voltages can be supplied in two ways:
– via terminal +24 V/48 V of the terminal block
– via terminal +24 V/48 V* of the terminal block
Version 04 07/2014
6 / n.c.
7 / n.c.
8 / n.c.
9 / n.c.
3.4 Connection of electrical bus lines
(male) should be used to connect data terminal equip-
ment. Max. length 100 m.
The electrical port must not be internally termi nated.
The external termination must be provided in or on
the connector of the bus line in accordance with the
Modbus Plus Standard.
The bus connection plug should be secured using
screws.
Voltage differences > 500 V could destroy the
repeaters or cause the system to malfunction!
Modbus Plus bus lines which are completely or partially
installed outdoors should not be connected, other -
wise any lightning strikes in the immediate vicinity
could destroy the repeaters.
Optical cables should be used for bus connections
which are routed out of buildings!
The common negative connection in the middle of the
terminal block is indicated by m (0 V).
The two voltages can have any (even different) values
within the specified limits of +24 V/+48 V.
If no signaling contact lines are connected to the
terminal block (see 3.6):
Secure the terminal block by screwing on the flange.
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