15 CMVPFB01A
Cyclic Data Access
5.3 Channel Data Size
P415 and P416 - Data Sizes
Default: N/A Range: 00.00 - 99.99
Access: RO Type: Integer
During network setup, it is necessary to program the network master with the amount of IN and OUT
cyclic data used for each slave device that it is associated with. This process is simplified with the use
of GSD support files (refer to paragraph 4.2.2, PROFIBUS-DP Master Setup Procedure, for details).
The amount of cyclic data configured in each SMV PROFIBUS-DP module must be equal to the amount
configured in the network master. Failure to do this may result in lost data and/or network master
configuration errors.
To aid this routine the SMV PROFIBUS-DP module has two useful parameters that display the amount
of IN and OUT cyclic data configured in the master and drive. Refer to Table 9.
Table 9: Directional Data Sizes
Parameter Function Format Description
P415 Master.Slave
Dout Data Size
xx.yy
xx = Master configured number of data WORDs
yy = Slave configured number of data WORDs
P416 Master.Slave
Din Data Size
xx.yy
EXAMPLE
The master PLC is configured for the slave node to have 4 IN words and 6 OUT words.
The drive is configured for 2 IN words and 6 OUT words
When the module is re-initialised (P418) as part of the commissioning routine it will fail to go online.
P419 will display the actual status.
Check P415 and P416 to identify the data size miss-match, i.e.
P415 = 04.02
P416 = 06.06
To clear the error, the amount of cyclic data used must be rectified and the module re-initialised
again.
NOTE
Depending upon the Acyclic data mode selected in P431 it may contribute towards the total
cyclic data count too. Refer to P431 for further details. The Acyclic data channels actually
utilise cyclic channels. Refer to section 6 for details on Acyclic parameter access
•
•
•
•
•
•
•
•
To Next Page
Loading...
Need help?
General
