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11.3.3
Useful data through PROFIBUS
Cyclic useful data
The positioner can exchange a combination of the following cyclic useful data through
PROFIBUS:
Name
German
Sollwert
Istwert
Aktorzustand
Fernkaskade Eingang
Fernkaskade Ausgang
Setpoint
The setpoint is divided into a floating point value (4 bytes) and the corresponding status (1
byte, see further below).
Actual value
The actual value indicates the valve position. The actual value is divided into a floating point
value (4 bytes) and the corresponding status (1 byte).
Position discrete
The discrete valve position is displayed as a value (1 byte) having the following meaning:
0 = not initialized
1 = valve closed
2 = valve open
3 = valve in the intermediate position: Even this value has a status (1 byte).
Checkback
The checkback is displayed in 3 bytes in a bit-coded format:
Bit
Meaning of "1"
0
0
Device in the fail safe position
1
Request for on-site operation
2
The device is operated on-site.
SIPART PS2 with PROFIBUS communication
Operating Instructions, 09/2007, A5E00127926-07
English
Setpoint
Position discrete
Checkback
Remote Cascade Input
Remote Cascade
Output
Functions/operations using PROFIBUS PA
Abbreviation
Direction from the
positioner's point of
view
SP
Input
RB
Output
POS_D
Output
CB
Output
RCAS_IN
Input
RCAS_OUT
Output
Remarks
The position is determined by the "49.FSTY"
parameter.
Reports that a button has been pressed.
The device is parameterized on-site, e.g. using the
"1.YFCT" parameter or is not initialized.
11.3 Cyclic data transfer
Length in
Comprising:
byte
5
Value/Status
5
Value/Status
2
Value/Status
3
Value
5
Value/Status
5
Value/Status
195
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