Connection to the PROFIBUS fieldbus
PROFIBUS is an asynchronous serial fieldbus. As a rule, all subscribers are connected
in a line (line topology). With its BUS IN and BUS OUT connections, the fieldbus module
serves as a T-connector to the MLG-2. The MLG-2 is connected to the fieldbus with a
stub cable. If replacement is necessary, the terminator (part number 6021156) must
be supplemented (MLG-1 has an internal resistor).
The bus cables must satisfy the characteristics for cable type A according to IEC
61156:
•
Two-wire, twisted and shielded
•
Impedance: 135 … 165 Ωat 3 … 20MHz
•
Capacitance: <30pF/m
•
Resistance: <110 Ω/km
•
Wire cross-section: >0.34mm
2
•
Wire diameter: >0.64mm
NOTE
•
Do not mix up the two PROFIBUS A and PROFIBUS B High data cables in the same
segment.
•
Connect a large area of the shielding to protective ground at both ends of the
cable.
We recommend using preassembled connection cables for the wiring (see "Accesso‐
ries", page 170.
T-connector for connecting the sender and fieldbus module
A T-splitter is available for the MLG-2, which connects the sender and fieldbus module
with each other and also provides the connection options for the power supply, switch‐
ing output 1 and the test input.
ELECTRICAL INSTALLATION 5
8018748.1Q3I/2024-12-18 | SICK O P E R A T I N G I N S T R U C T I O N S | MLG-2 ProNet
53
Subject to change without notice
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