Manual
ibaLink-VME
56
Issue 1.8
Note
We recommend that the sequence in the cascade (predecessor
successor) is accord-
ing to the ascending address order, although this is not mandatory.
In case of overlapping ranges the successors overwrite the data of the predecessors,
independent from the addresses.
9.4
Cascade with 32Mbit Flex
Up to 15 ibaLink-VME cards or other iba devices, which support 32Mbit Flex mode, can
be cascaded in a FO ring (only channel 1).
Switch S3 (Address) specifies a unique device address 1…F, which corresponds to an
address 1..15.
Example:
Figure 26 Cascading with Flex devices
The amount of data per participant is not defined by switches like in 3Mbit mode, but is
allocated dynamically. According to the number of analog and digital signals configured
in ibaPDA and the configured timebase the amount of data is calculated by ibaPDA.
The maximum total data rate is determined by the fiber-optic links and must be divided
through the number of devices and the amount of data per device. A reference value is
approx. 3000 bytes per ms.
The devices can work with different cycle times, however the cycle time must be an
integer multiple of the smallest cycle.
If the maximum data rate is exceeded, ibaPDA displays an error message and recom-
mends increasing the timebase or decreasing the amount of data.
