Connecting The M-Bus - Siemens SIMATIC PN/M-Bus LINK Operating Instructions Manual

Connecting

7.6 Connecting the M-Bus

7.6 Connecting the M-Bus
Connecting the M-Bus
①
M-Bus connection
Note
The maximum permissible length of the connecting cable is 300 m.
Depending on the properties of the cable used, the baud rate and the number of connected
slaves, the permissible length of the cable can be less than 300 m.
Connector pin assignment
The following figure shows the assignment of the terminal for the M-Bus connection.
Table 7- 2
Permissible torques for screw terminal:
● Minimum tightening torque: 0.5 Nm
● Maximum tightening torque: 0.6 Nm
34
Terminal assignment for the M-Bus connection
M+ M-Bus connection (+)
M- M-Bus connection (-)
M-Bus cable shield
Also see information and notes on shielding in the section
Power supply and potential ratios (Page 28).
The PN/M-Bus LINK is connected to the M-Bus via a two-
wire cable to the M-Bus connection
Conductor cross-section: max. 1.5 mm
Suitable cables: Twisted two-wire line YCYM or J-Y(ST)Y 2
x 2 x 0.8 mm.
To ensure interference-free communication, we recom-
mend that you use a shielded cable for the connection.
Operating Instructions, 03/2018, A5E44260928-AA
①
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PN/M-Bus LINK