The Control Word And The Status Word - ABB ACS 400 User Manual

The Control Word and the Status Word

Holding registers: 40001 (Control Word), 40004 (Status Word)
The Control Word (CW) is the principal means for controlling the drive from a fieldbus system. It is
effective when
• The drive is in external (remote) control and the controlling commands are received through
serial communication channel (set by parameters 1001 EXT1 COMMANDS, 1002 EXT2 COM-
MANDS and 1102 EXT1/EXT2 SEL), and
• Serial communication channel that is used for the controlling is Standard Modbus (parameter
5006 COMM COMMANDS is set to 1 (
The Control Word (detailed in Table 27) is sent by the fieldbus master station to the drive. The drive
switches between its states according to the bit-coded instructions of the Control Word. See also
state machine on page 132.
The Status Word (SW) is a word containing status information, sent by the drive to the master
station. The composition of the Status Word is explained in Table 29.
Note! Operation of Control Word and Status Word conforms to ABB Drives Profile with the
exception of Control Word bit #10 (REMOTE_CMD), which is not used by the ACS 400.
Table 27 The Control Word. See also the state machine on page 132.
Bit Value
0 1 Enter
0 Emergency OFF. Ramp to stop according to parameter 2203
ACTIVE
1 1 Continue operation (OFF2 inactive)
0 Emergency OFF, coast to stop.
Enter
2 1 Continue operation (OFF3 inactive)
0 Emergency stop. Drive ramps to stop according to parameter 2205
3
OFF
3 0 -1 Enter
digital input – see parameter 1601
0 Inhibit operation. Enter
4 Unused.
5 1 Normal operation.
Enter
0 Halt ramping (Ramp Function Generator output held)
6 1 Normal operation. Enter
0 Force Ramp Function Generator input to zero.
7 0 - 1 Fault reset (enter
0 (Continue normal operation)
8 to 10 Unused
11 1 Select external control location 2 (
0 Select external control location 1 (
12 to 15 Unused
ACS 400 User's Manual
STD MODBUS
READY TO OPERATE
; proceed to
READY TO SWITCH ON
2 ; proceed to
OFF ACTIVE
; proceed to
ACTIVE SWITCH
(Note that also the Run enable signal must be present on a
OPERATION ENABLED
OPERATION INHIBITED
RAMP FUNCTION GENERATOR
OPERATING
-
SWITCH ON INHIBITED
).
Description
unless other interlocks (OFF2, OFF3) are active.
- .
SWITCH ON INHIBITED
- .
ON INHIBITED
.
RUN ENABLE
:
ACCELERATOR ENABLED
)
2)
EXT
1)
EXT
1. Enter
OFF
DECELER TIME
2. Enter
DECELER TIME
1
127