Useful Data Through Profibus - Siemens SIPART PS2 Operating Instructions Manual

Functions/operations using PROFIBUS PA
9.3 Cyclic data transfer
9.3.2

Useful data through PROFIBUS

Cyclic useful data
The positioner can exchange a combination of the following cyclic useful data through
PROFIBUS:
Name
German
Setpoint
Readback
Position discrete
Checkback
Remote Cascade Input
Remote Cascade Out‐
put
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.
212
English
Setpoint
Readback
Position discrete
Checkback
Remote Cascade Input
Remote Cascade Out‐
put
Abbreviation Direction from the posi‐
tioner'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.
Length in
byte
5
5
2
3
5
5
SIPART PS2 with PROFIBUS PA
Operating Instructions, 05/2019, A5E00127926-AC
Comprising:
Value/Status
Value/Status
Value/Status
Value
Value/Status
Value/Status