ABB ACS880 Firmware Manual page 471

No. Name / Range /
Selection
50.51 FBA B timelevel sel
Normal
Fast
Very fast
Monitoring
50.56 FBA B comm
supervision force
b0 Ext 1
b1 Ext 2
b2 Local
b3...15 Reserved
0000h...FFFFh
50.99 FBA automatic
detection
Disable
Enable
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 word, Act1
and Act2.
** Cyclic low data consists of the parameter data
mapped to parameter groups
FBA B data out, and acyclic data.
Control word, Ref1 and Ref2 are handled as interrupts
generated on receipt of cyclic high messages.
Note: This parameter cannot be changed while the
drive is running.
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 vs. external control (page
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.
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.
Enables/disables the FBA automatic detection.
Note: FBA automatic detection works with one fieldbus
adapter only.
FBA automatic detection is disabled.
FBA automatic detection is enabled.
Cyclic low **
10 ms 2 ms
2 ms 10 ms
500 μs 2 ms
250 μs 2 ms
55 FBA B data in
39)).
Parameters 471
Def / Type
FbEq 16b / 32b
Normal / uint16
and 56
0
1
2
3
- / uint16
Local
1 = 1
Enable / uint16
0
1