Common Properties - WEST POS-124-U-PFN Technical Documentation Manual

12.3 Common Properties

The connectors of the driver block correspond as far as possible to the description in the previous chapter.
The following differences have to be considered:
•
Transduction of setpoint positions in the number format "real" and unit [mm]
•
Transduction of the speed setpoint in the number format "real" and [%] related to the parameterized
value.
•
The signals allowing to change parameters are bundled in structures (usage is optional).
•
As parameter „DEV_ID" the hardware identifier of the IO Module has to be entered (TIA)
•
As parameters ADR_IN / ADR_OUT the starting addresses (see HW config.) have to be entered
(Step 7 classic).
•
The values „SENSEERROR1/2" are not inverted, which mean "TRUE" indicates the presence of an
error.
•
The bit "BUS_VALID" signals the operation of the bus data transfer.
•
If needed, the output „BUS_ERROR_CODR" yields detailed diagnostic information
Nr.
1
2
3
4
5
6
7
8
•
Feedback of the actual positions and internal setpoints in the number format "real" and unit [mm]
If the bus data exchange is faulty, the feed back values are not reliable. In most cases they will be frozen in
that case. If the output values are processed and used to control further functions, the valid bit has also to be
considered. In case of a bus failure adequate fall-back values have to be used so that the complete system
is kept in a safe state.
Application example:
On the following page an example with minimum usage of the signals is shown, basis is a positioning of two
independent axes. No manual commands are used and the control should be permanently active. Drift com-
pensation and fine positioning are no used in this case.
Page 68 of 70
Bit Funktion
0 Internal data error (DERROR)
1 Checksum error Profinet (CHKERROR)
2 Data overflow error Profinet (BUFFEROV)
3 Receiving error (access to the input addresses, module -> PLC)
4 Transmitting error (access to the output addresses, PLC -> module)
5 No data exchange (Watchdog)
6
7
BUS ERROR CODE
POS-124-U 24.01.2022