Nidec SI-Interbus 2 MBd, User Manual

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SI-INTERBUS User Guide
25
Issue Number: 1
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6.4.9 Cyclic data mapping status
If the SI-Interbus operating status parameter (Pr MM.006 ) indicates a value of -3,
a mapping configuration error has been detected. The actual reason for the error is
indicated by the mapping status parameter, Pr
MM.049 . When a mapping error has
been corrected, reset the SI-Interbus by setting Pr MM.032 to On.
Possible values for the mapping status are shown in Table 12-2 Mapping status
codes .
6.4.10 Block mapping
Block mapping provides a quick and convenient way of mapping sequential parameters
to the Interbus network with the minimum number of mapping parameters specified.
Block mapping is used automatically if:
•
The value entered in the mapping parameters (Pr MM.010 to MM.029 ) are specified
in ascending order (i.e. lowest value parameter number first).
• The menu number of adjacent mappings are identical.
For example, the following mappings would map 5 x 32-bit parameters in menu 20,
starting from Pr
20.021 to Pr 20.025 inclusive as inputs and 5 x 16-bit parameters in
menu 18, starting from Pr 18.011 to Pr 18.015 inclusive and 5 x 16-bit parameters in
menu 19, starting at Pr 19.021 to Pr 19.025 inclusive as outputs.
Table 6-5 Block mapping example
For this example to work, data compression must be enabled (Pr MM.034 = On).
The following table shows the data structure for the example mappings.
Cyclic Data Mapping Status
Pr MM.049
Default None
Type 8-bit
Access RO
If the mapping configuration size has changed (Pr MM.005 Interbus Data Format ),
then the module reset is insufficient to fully initialise the Interbus network and after saving
parameters, the module must be power-cycled.
NOTE
NOTE
Care must be taken to ensure the total number of cyclic mappings specified does not
exceed the maximum number allowed (Pr
MM.005 ).
Mapping Parameter Mapping Value
Pr MM.010 2021
Pr MM.011 2025
Pr MM.012
to
Pr MM.019
0
Pr MM.020 1811
Pr MM.021 1815
Pr MM.022 1921
Pr MM.023 1925
Pr MM.024
to
Pr MM.029
0
NOTE NOTE