W.E.S.T. Elektronik POS-123-P-PFN, Техническая документация инструкция

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Page 52 of 53 POS-123-P-PFN 31.03.2021
8.2 Function
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:
•
Transmission
of setpoint positions in the number format “real” and unit [mm]
•
Transmission of the speed setpoints
in the number format “real” and [%] related to the parametrised
value.
•
The Signals allowing to change parameters are bundled in structures. This serves as an interface to a
parameterisation module that is described in another manual and is also provided free of charge.
•
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
(TIA_KLASSIK).
•
The values IAERROR, IBERROR, XERROR 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:
BUS ERROR CODE
Nr. Bit Funktion
1 0 Internal data error (DERROR)
2 1
3 2 Internal data overflow or checksum error (BUS ERROR)
4 3 Receiving error (access to the input addresses, module -> PLC)
5 4 Transmitting error (access to the output addresses, PLC -> module)
6 5 No data exchange (Watchdog)
7 6
8 7
Feedback of the actual position, the control deviation and the internal setpoint is given in the number format
“real” in the unit [mm].
The control signals are output in "real" format as percentage values.
If the bus data exchange is faulty, the fed 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 con-
sidered. In case of a bus failure adequate fall-back values have to be used so that the complete system in kept
in a safe state.