EXCEL 100C INSTALLATION INSTRUCTIONS
23 EN1R-0144GE51 R1007
System Bus (C-Bus)
Up to 30 controllers can communicate with one another and a PC central via the
system bus. In addition to Excel 50, 100, 500/600/800 controllers, other system bus
compatible components can also be connected (Excel IRC Multicontroller, Excel
EMC). The system bus must be connected through the individual controllers (open
ring).
Fig. 2. Open-ring connection of controllers
Excel 800 Excel 100 Excel 500 Excel 50
NOTE:
Star connection is not permissible because uncontrollable line reflections
may occur.
For setting up the system bus in the right way, three steps have to be followed:
•
cable specification for system bus
•
baud rate selection
The maximum communication speed of the XC5010C/XCL5010/Excel 50 /
Excel 100C is 76800 baud. These controllers can be mounted together with the
XC6010 or Excel 100B (with XD505A or XD508 submodule) since the XC5010C /
XCL5010 / Excel 50/Excel 100C communication speed can be adjusted to match
either submodule.
NOTE:
When changing the baud rate of bus devices, proper communication
cannot be ensured until all bus devices are set to the same baud rate
again.
NOTE:
When adding or removing a controller to/from the C-Bus, it may take up to
two minutes to re-initialize the bus. During this time communication on the
C-bus is lost.
See page 14 for details on setting the C-Bus termination on the Excel 100C.
IMPORTANT
For communication with more than 9600 baud it is required to enable the
termination of the first and the last device on the C-bus (see page 14). The
controllers with termination must be switched on prior to the controllers in
the middle of the C-bus. The C-bus might not work if the controllers with
termination are switched off.
System Bus Cable Types
The cable specification depends mainly on the baud rate. There are regional
differences as to whether shielded or unshielded cable must/can be used.
For detailed information on cables to be used in accordance to regional
requirements, please refer to the U.S. and European Specifications chapters.
System Bus Extension by Using Repeaters
The system bus length can be extended by using repeaters. Each repeater extends
the bus length by the amount of a single bus length. Due to differences in regional
guidelines, the maximum number of repeaters that may be added to a bus varies.
For detailed information on repeaters to be used in accordance to regional require-
ments, please refer to the U.S. and European Specifications chapters.
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