ABB ACS880 Firmware Manual page 258

258 Parameters
No. Name/Value
50.21 FBA A timelevel sel
Normal
Fast
Very fast
Slow
50.31 FBA B enable
Disable
Option slot 1
Option slot 2
Option slot 3
50.32 FBA B comm loss
func
No action
Fault
Last speed
Description
Selects the communication time levels.
In general, lower time levels of read/write services reduce
CPU load. The table below shows the time levels of the
read/write services for cyclic high and cyclic low data with
each parameter setting.
Selection Cyclic high *
Slow
Normal
Fast
Very fast
* Cyclic high data consists of fieldbus Control and Status
words, Ref1, Ref2, Act1 and Act2.
** Cyclic low data consists of the parameter data mapped to
parameter groups 52 FBA A data in
Acyclic data is handled as a background task.
Normal speed.
Fast speed.
Very fast speed.
Slow speed.
Enables/disables communication between the drive and
fieldbus adapter B, and specifies the slot the adapter is
installed into.
Communication between drive and fieldbus adapter B
disabled.
Communication between drive and fieldbus adapter B
enabled. The adapter is in slot 1.
Communication between drive and fieldbus adapter B
enabled. The adapter is in slot 2.
Communication between drive and fieldbus adapter B
enabled. The adapter is in slot 3.
Selects how the drive reacts upon a fieldbus communication
break. The time delay is defined by parameter
comm loss timeout.
No action taken.
Communication break detection active. Upon a
communication break, the drive trips on a
communication fault and coasts to a stop.
Communication break detection active. Upon a
communication break, the drive generates a warning
FBA B communication) and freezes the speed to the level the
drive was operating at. The speed is determined on the basis
of actual speed using 850 ms low-pass filtering.
WARNING! Make sure that it is safe to continue
operation in case of a communication break.
Cyclic low **
10 ms 10 ms
2 ms 10 ms
500 µs 2 ms
250 µs 2 ms
and 53 FBA A data
50.33 FBA B
7520 FBA B
Def/FbEq16
Normal
out.
0
1
2
3
Disable
0
1
2
3
No action
0
1
2
(A7C2