DMI
52
11/04 MN01219002Z-EN
Figure 10: Switching element on the DMI: Switch fieldbus
controlled via level of the output data
a
The motor is switched on at location by the switch on the DMI.
b
The switch on via the fieldbus has no external effects as the
motor is already switched on.
c
The motor is switched off again by resetting the control bit on
the fieldbus, even though the switch is still positioned to “ON”.
The switch off takes priority here for safety reasons.
d
The motor is already switched off, therefore local the switch off
signal has no effect.
e
The fieldbus switches the motor back on.
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 on location at
g
.
g
The motor is switched off again locally by opening the switch.
In this case the switch off command also takes priority for safety
reasons, even though the “ON” signal is still present on the
fieldbus.
h
The switch off via the bus does not have an effect as the motor
is already switched off.
a b
c
d
e
f
g
h
Switch
Motor
Fieldbus
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