ABB ACSM1 - Page 208

Parameters and firmware blocks
208
50.12 FBA CYCLE TIME FW block: FIELDBUS (see above)
Selects the fieldbus communication speed. The default selection is (2) Fast. Lowering the speed
reduces the CPU load.
The table below shows the read/write intervals for cyclic and cyclic low data with each parameter
setting.
*Cyclic data consists of fieldbus CW and SW, Ref1 and Ref2, and Act1 and Act2.
**Cyclic low data consists of the parameter data mapped to parameter groups 52 and 53.
(0) Slow Slow speed selected.
(1) Normal Normal speed selected.
(2) Fast Fast speed selected.
50.20 FB MAIN SW FUNC FW block: FIELDBUS (see above)
Contains various compatibility settings especially for drive retrofits.
Selection Cyclic* Cyclic low*
Slow 10 ms 10 ms
Normal 2 ms 10 ms
Fast 500 us 2 ms
Bit Name Information
0 Run enable func 1 = Parameter only:
Bit 1 of 2.13 FBA MAIN SW is set to 1 whenever the external run
enable signal (par. 10.09 RUN ENABLE) is 1.
0 = Param AND Fb cw:
Bit 1 of 2.13 FBA MAIN SW is set to 1 whenever both the external
run enable signal (par. 10.09 RUN ENABLE) is 1 AND 2.12 FBA
MAIN CW bit 7 (RUN ENABLE) are 1.
1 Mech brake func 1 = Force ramp stop:
Drive always uses ramp stop when a mechanical brake is used.
0 = Allow coast stop:
Coast stop is allowed when a mechanical brake is used.