ABB ACS880 Firmware Manual page 381

No. Name/Value
50.51 FBA B timelevel sel
Normal
Fast
Very fast
Monitoring
50.56 FBA B comm
supervision force
Bit Name
0 Ext 1
1 Ext 2
2 Local
3...15 Reserved
0000b...0111b
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 *
Monitoring
Normal
Fast
Very fast
* Cyclic high data consists of fieldbus Status words, Act1
and Act2.
** Cyclic low data consists of the parameter data mapped to
parameter groups 55 FBA B data in
and acyclic data.
Control word, Ref1 and Ref2 are handled as interrupts
generated on receipt of cyclic high messages.
Normal speed.
Fast speed.
Very fast speed.
Low speed. Optimized for PC tool communication and
monitoring usage.
Activates fieldbus communication monitoring separately for
each control location (see section
control on page 40).
The parameter is primarily intended for monitoring the
communication with FBA B when it is connected to the
application program and not selected as a control source by
drive parameters.
Value
1 = Communication monitoring active when Ext 1 is being used.
1 = Communication monitoring active when Ext 2 is being used.
1 = Communication monitoring active when local control is being
used.
FBA B communication monitoring selection.
Cyclic low **
10 ms 10 ms
2 ms 10 ms
500 µs 2 ms
250 µs 2 ms
and 56 FBA B data
Local control vs. external
Parameters 381
Def/FbEq16
Normal
out,
0
1
2
3
0000b
1 = 1