7. Menu 74 Parameters
ALSPA PROFIBUS Field Bus Coupler
Page 7-4
Technical Manual
(09/06)
7.4.7
Use FBC Data P74.06
The default value of this parameter is 1 (Enable). If it is set to 0
(Disable), the 'receive network data' is scaled and can be viewed by
the spy viewer, but the data will not be copied to the destination
parameters specified by the receive pointers.
7.4.8
Source Loss Action P74.07
A loss of reference may be declared if the PROFIBUS link detects a
loss of communications with the master.
When a loss of reference is declared, one of three things can
happen depending on the setting. Valid values:
0
Ignore loss of reference errors and carry on running.
1
On a loss of reference set a warning and carry on
running.
2
On a loss of reference trip the drive.
The warning code for loss of communications is 106, and the trip
code is 204.
Status flag 97 indicates whether Fieldbus communications are
healthy or not. Status flag 97 can be viewed using parameter
P11.35.
7.4.9
Freeze/Fallback Action P74.08
On an MVS3007-4001 PROFIBUS card, switch S3-5 (see Section
3.3) must always be set to OFF.
This parameter determines the action taken by the drive if the link to
the PROFIBUS master fails. It affects what values are copied into
the Fieldbus reference parameters defined in Section 7.4.12. If
freeze is selected the parameter value freezes to the last good
received data. If fallback is selected, the associated fallback value
(refer to Table 7-5, parameters 74.20 to 74.43) is copied into the
appropriate references.
