Siemens 6DR55 Series Manual page 137

Electropneumatic positioner for linear and part--turn actuators
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Manual
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SIPART PS2 PA Manual
A5E00127926--05
NOTE
Note that the positioner will respond after the transmission with the
quality "Bad" and the status "value constant".
On leaving this target mode and if no further master sends a setpoint
to the positioner, the positioner after the set monitoring period will
adopt the parameterized fail safe value.
Even if cyclic communication is running, a setpoint can be sent to the
positioner using PDM. For this precedence over the cyclical master
must previously have been set up.
Perform the following settings:
Open the "Operating mode" register
S
Set the target mode to "Manual".
S
Enter an initial value between 0 and 100%, quality "Good" and
S
Status "OK".
Upload the settings into the positioner.
S
The positioner will now control to the desired initial value and will report
this in manual mode by showing "MM" in the display.
Note that in manual mode the initial value entered will be written
without proportioning directly into the initial block of the positioner.
Set the positioner locally into manual mode and adjust the drive using
the keys. The setpoint will then be set to the current readback. After
switching back into automatic operation, the manual mode and the
exact current setting will be maintained.
After a loss of electrical power the positioner will perform in manual
mode according to the direction of control action of the drive on the set
values for YA or YE.
NOTE
For the cyclical master's setpoints to take effect again, the target mode
must be set to "Automatic".
Functions/operation via PROFIBUS PA
135

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