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4-10
H Free Allocation Restrictions
• Each node address can be set only once in the output blocks and once in the input blocks.
The same node ad-
dress cannot be set
twice.
Output block 1
Node 02
Output block 2
Node 02
WRONG
• If a Configurator is used to freely allocate words or bytes to each Slave, only a Slave using only one
byte (8 bits) can be set in the leftmost byte of the allocated word. Slaves with more than 8 bits cannot be
set for the leftmost bit of the allocated word.
Only one byte can be set
if the first byte is a left-
most byte.
Start byte
WRONG
15 0
• The same Slave cannot be allocated words in more than one Master.
Master
Master
Slave
Words must be allocated to a
Slave from one Master only.
WRONG
Note The master parameter file duplication check from the Configurator can be used to check for node
addresses that have been set more than once in the scan list, which shows the I/O allocations that
have been made.
• Always use the Configurator when there is more than one Master and enable the scan lists. A Bus OFF
error can occur if there is more than one Master with the scan list disabled on the same Network.
CompoBus/D System Startup Chapter 4