CompoBus/D System Startup | Chapter 4 | |
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HFree 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.
WRONG
Output block 1
Node 02
Output block 2
Node 02
•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.
WRONG
Start byte |
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15 | 0 |
•The same Slave cannot be allocated words in more than one Master.
MasterMaster
Words must be allocated to a
Slave from one Master only.
WRONG
Slave
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.
