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951-170-218-EN
Version 06
EN
3. Overview, functional description
3.5 Design-speciic components
Fieldbus coupler, Fig. 3
Legend to Fig. 3
Plug
Function
H1/H2 Indicate the status of the
connection to the PROFIBUS
H3/H4 Indicate the status of the
connection to the MQL control unit
1
M12x1 connection to MQL system
2
M12x1 connection for
termination resistor
3
M12x1 PROFIBUS connection
4
Fastening screw
5
Termination resistor
Plug contact
Assignment
1
NC
2
BUS-N=A
3
BUS nc
4
BUS-N=B
5
Shielding
Note!
In a de-energized state, all LEDs are
transparent. Normal operation is shown.
1
2
4
3
5
2
1
3
4
5
H2
H1
H3
H4
H1 = Green LED (PROFIBUS)
H2 = Red LED (PROFIBUS)
H3 = Green LED (MQL)
H4 = Red LED (MQL)
Union
nut
See Figure 3
MQL systems with PROFIBUS interface
come with a PROFIBUS fieldbus coupler
(Fig. 3). The MQL system behaves like an I/O
device connected to the bus.
Data is exchanged via input and output
bytes.
For unique identification of the MQL
system on the PROFIBUS, the bus address
must be set. The address is set with the
rotary decade switches at the respective
control unit (see Chapter 7.1).
For diagnostic purposes, the PROFIBUS
DP fieldbus coupler has four LEDs, which
indicate whether a data connection exists
during commissioning or in case of errors
(see Table 1).
3.5.1 PROFIBUS communication interface
M12x1 plug, B-coded
