ALSPA PROFIBUS Field Bus Coupler
8. Menu 75 Parameters
(09/06)
Technical Manual
Page 8-5
8.5.9
Received Data Parameters P75.22 to P75.27
In order to use the data received in the PPO, it must be placed
somewhere for the drive to use. Parameters P75.22 to P75.27 allow
the relevant PPO word to be placed in a destination parameter.
While some parameters can be directly written to, others, such as
references, cannot. For this reason a group of reference
parameters are available to hold the received reference. Menu 42
then points to these references for inclusion into the relevant
reference selector.
8.5.10
References P75.12 to P75.21
The PROFIBUS module can provide up to 5 references for use
within the drive. These references can be used to control such
values as the speed (if pointed to by one of the speed reference
pointers). The PROFIBUS reference module needs to be used in
conjunction with Menu 42 (the Pointer Menu), which is described in
Section 6 of the Software Technical Manual T1679.
To send data from Ref. 1 parameter 1 to PZD1 (P75.12), for
example:
-
Set Ref. 1 parameter 1 to point at the reference parameter,
ie. P75.23 = 75.12
The data received at this position will then be copied to P75.12.
WARNING:
Ensure that no two Fieldbus parameters are mapped to the
same Drive parameter as this will lead to unpredictable
results.
If a loss of PROFIBUS reference is declared, (see Section 7.4.8)
the reference value will no longer be updated by the PROFIBUS
link. In this situation the user has the choice of using the last value
obtained from the PROFIBUS link or using the fallback value.
In the above example, the fallback value for reference 1 can be set
to 0 by setting P75.13 = 0. To use the fallback value instead of the
last value received over the PROFIBUS link set P75.07 = 1. If this
reference value were linked to the speed reference for example,
