Fieldbus control with embedded fieldbus 333
DCU communication profile
Because the DCU profile extends the control and status interface to 32 bits, two
different signals are needed for both the Control words (0301
and 0302) and Status
words (0303 and 0304).
Control words
The following tables describe the Control word content for the DCU profile.
DCU profile Control word, parameter 0301 FB CMD WORD 1
Bit Name Value Information
0 STOP 1 Stop according to either the stop mode parameter (2102) or
the stop mode requests (bits 7, 8 and 9).
Note: Simultaneous STOP and START commands result in
a stop command.
0 No operation
1START 1 Start
Note: Simultaneous STOP and START commands result in
a stop command.
0 No operation
2 REVERSE 1 Reverse direction. The direction is defined by using the
XOR operation on bit 2 and 31 (= sign of the reference)
values.
0 Forward direction
3 LOCAL 1 Enter local control mode.
0 Enter external control mode.
4 RESET -> 1 Reset.
other No operation
5 EXT2 1 Switch to external control EXT2.
0 Switch to external control EXT1.
6 RUN_DISABLE 1 Activate Run disable.
0 Activate Run enable.
7 STPMODE_R 1 Stop along currently active deceleration ramp (bit 10). Bit 0
value must be 1 (STOP).
0 No operation
8 STPMODE_EM 1 Emergency stop. Bit 0 value must be 1 (STOP).
0 No operation
9 STPMODE_C 1 Coast to stop. Bit 0 value must be 1 (STOP).
0 No operation
10 RAMP_2 1 Use acceleration/deceleration ramp pair 2 (defined by
parameters 2205…2207).
0 Use acceleration/deceleration ramp pair 1 (defined by
parameters 2202…2204).
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