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Number of retries
on the PA side
Fig. 85 - Configuration of bus parameters on PA
Options for the Watchdog selection:
•
Off (not recommended)
•
No change (PA watchdog is the same as DP watchdog)
•
Scaled (Watchdog is calculated based on DP watchdog)
•
User-defined (enter the watchdog time manually).
The number of retries can also be adjusted. This must be a number between 0 and 15.
12.4 Coupler mode
rd
Make sure to set the 3
dipswitch 'LNK' to 'OFF' (to the left). Then connect a
power source to the connector on top of the module. The DC voltage offered to
the PA coupler module is the same as the output on the PA side. The minimum
is 11VDC, maximum is 28VDC.
This module is now a fully functional PROFIBUS PA coupler. It is totally transparent up to 1.5 Mbit/s, it also
sends FDL status requests onto PA. It supports connection of up to 32 devices that can take up a total of 500mA
from the bus. Furthermore, all functionality described in paragraph 12.2 is also available in Coupler mode.
To receive telegrams from a PLC or DCS in Coupler mode, you need to install another module in the
ComBricks backplane. This module can be any PROFIBUS DP interface card, either fiber optic or
copper. All modules in chapters 7, 8 and 9 can be used. Set this DP card to the same network as the
PA Coupler module.
12.4.1 Bus Parameters
Some adjustments to the bus parameters in the PLC or DCS need to be made. Follow Table 8 for your master
project:
ComBricks User Manual v6.4.0 | January 18| © PROCENTEC
Setup the PA side
Watchdog
User-defined
Watchdog time
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