DMI
50
11/04 MN01219002Z-EN
Figure 8: Switching element on the DMI: Switch fieldbus
controlled via command codes
a
The motor is switched on at location by the switch on the DMI.
b
The switch on command on the fieldbus has no external effects
as the motor is already switched on.
c
The fieldbus switches off the motor even though the switch is
still positioned at “ON”. The switch off command takes priority
here for safety reasons.
d
The motor is already switched off, therefore the local switch off
signal has no effect.
e
The fieldbus switches the motor back on via a command.
f
The switch is also set to “ON” on location. This step has no
external influence as the motor is already switched on. The use
of a switch (instead of a button) is necessary in order to be able
to switch off the motor locally at
g
.
g
The motor is switched off again locally by opening the switch.
In this case, the switch off command will also take priority even
though the motor was not originally switched on via the switch
but rather via the fieldbus.
h
The switch off command via the bus does not have an effect as
the motor is already switched off.
a b
c
d
e
f
g h
Switch
Fieldbus command
Motor
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