Appendix A.Configuration Example ALSPA PROFIBUS Field Bus Coupler
Page A4
Technical Manual
(09/06)
PROFIBUS reference 1, see Table A-4. The received data is
transferred using the Reference Pointers in P75.23 to P75.27.
In this example we will use Reference Pointer 1 to transfer the
Speed Reference, Reference Pointer 2 retains its configuration from
the above "simple example".
Table A-4 Reference parameter set-up
Parameter
Value
Meaning
P75.23
75.12
Ref. 1 = P75.12 = PPO PZD2 word
P75.24
5.17
PPO PZD3 - P5.17 minimum speed
P75.25
0
PPO PZD4 word not used
P75.26
0
PPO PZD5 word not used
P75.27
0
PPO PZD6 word not used
Having configured the P75.23 pointer to transfer data to a Fieldbus
reference "holder", the user has the option of declaring a ‘fallback’
value for that reference. This will be dealt with later.
Reference Scaling and Masking
The ‘holder’ for the received reference can only have a value of
±
100.00%, which internally is represented as ±10000. It is
necessary to enter a value of 10,000 into P75.28 to make the drive
scale a received value of 10,000 into 10000. As the scaling will
apply only to the first reference, the second and third bits in the
Scale Reference Mask, P75.29, need to be a ‘1’ and a ‘0’
respectively. The default setting, where the second, third, fourth and
fifth bits are ‘1’, so P75.29 must be changed to read
0000000000000010 binary which is 0002H. It is necessary to know
the hexadecimal value as the parameter requires the value to be
entered as hexadecimal.
Once the PROFIBUS reference has been configured it is necessary
to configure the speed reference to come from the Fieldbus
Reference 1. Each of the drive references has a parameter or
parameters that set-up where the source of that reference is. For
the speed references these parameter are P5.01 to P5.05. These
parameters need to be configured to source the reference from the
‘Pointer menu’, Menu 42. Each of the pointers in Menu 42 is
dedicated to one of the drive references. The speed reference has
pointers 1 and 2 dedicated to it. We will use pointer 1, see Table A-
5.
