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Section 10: Data Exchange During Parameterization
August 2022
It should be noticed that every time that Profibus communication is established, the
parameterization string will be sent to the device writing the parameters to the set up
values. The values in parameterization string shall be modified at the Master station.
Byte 0-2
Byte 3
Byte 4
NOTE:
Fail-safe action is active only if watchdog control is enabled.
Byte 5
Byte 6
Byte 7
26
Reserved for DPV1
Storage format
This byte defines the format of the variables that are transmitted on 2 or 4
bytes. The setting of this parameter affects the format of the following data:
Output data:
(if module 2 is selected)
Input data:
(if module 2 is selected)
General data:
Slot 1 index 1
Value:
0: LSB byte is transmitted first
(default setting)
1: MSB byte is transmitted first
Fail-safe action
This byte defines the action of the actuator in case of loss of signal. The
action takes place only if the local selector is on Remote position and if the
bus is operating. When the bus signal restores, the actuator also restores at
its normal functioning.
Value:
0: Off - disable (default setting)
1: Close
2: Open
3: Stay put
4: Go to position indicated in the parameter "safe position"
Delay before initiating fail-safe operation
This byte defines the delay before execution of the programmed safe action.
Value:
minimum
maximum
default value:
Safe position
This byte defines the safe position when "fail-safe action: go to position"
is selected.
Value:
minimum
maximum
default value:
Dead band
This byte defines in tenth of % the dead band of the positioning function
available on the modulating actuator. The movement is inhibited until the
difference between current position and requested position (position error)
is lower than dead band.
Value:
minimum
maximum
default value:
Installation, Operation and Maintenance Manual
0 s
10 s
4 s
0%
100%
50%
3 = 0.3%
20 = 2.0%
15 = 1.5%
Data Exchange During Parameterization
VCIOM-17121-EN Rev. 0
Set point
Current position
Current position
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