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Compiler – Examples
State machine, fieldbus control with emergency mode
18.9
kVA
i
f
n
18
Hz
P Hz
State machine, fieldbus control with emergency mode
A drive is to be controlled via the fieldbus in normal mode. However, in the event of a
bus fault, manual operation via terminal and analog value should be possible. Further,
provisions have to be made for a mixed mode (fieldbus setpoint + analog setpoint). The
operating mode is set using input terminals DI10 and DI11. The selected operating
mode is to be displayed on outputs DO10 and DO11. The following operating modes
should be provided:
INFORMATION
Use "IPOS" to assign PO data and base the control word on the ControlWord H484,
otherwise there will be a problem in mode 2 if the bus fails.
The following status chart shows the transitions between the operating modes:
Chart of mode statuses:
01
Mode 0
Mode 1
00
01
01
00
00
11
10
10
11
10
Mode 3
Mode 2
11
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Manual – IPOSplus®
261