Lenze EVS9332xP Instrukcja Użytkownika Pobierz pdf (Strona 149)

Function library

Function blocks

3.5.12 BCD decade switch (BCD)

3−121

EDSVS9332P−EXT DE 2.0

3.5.12.2 Signal processing

Reading the BCDs:

Output Signal Function

BCDx−EOT

LOW Beginning of the BCD reading.

HIGH If

· all 8 absolute value digits and the sign are transmitted or

· "CANCEL" has been identified.

BCDx−NEW−DATA

LOW After a LOW−HIGH edge at BCD−READ.

HIGH After the transmission of a BCD is completed.

BCDx−DATA−FLT HIGH If "BCD error" has been identified (see table in chapter 3.5.12.1).

BCDx−FAIL HIGH If

· the permissible value range for the target code is exceeded or

· BCDx−DATA−FLT = HIGH has occurred before.

BCD_A

BCD1x-LOAD

BCD1x-BUSY

BCD1x-FAIL

Correct transmission

Wrong transmission

Fig. 3−76 Signal shape for FB BCD1 for the transmission to the target code

Transmission sequence of data to the target code:

Output Signal Function

BCDx−LOAD LOW−HIGH edge Transmits the signal to the target code.

BCDx−BUSY HIGH For the time of transmission

BCDx−FAIL HIGH If a transmission error occurs.

Only another LOW−HIGH edge at BCDx−LOAD switches BCDx−FAIL = LOW.

Transmission error:

· No target code

· No target subcode.

· transmitted data are out of the target code limits.

· "BCD error" has been identified (BCDx−DATA−FLT = HIGH).

· The target code is inhibited. Code can only be written when the controller is inhibited.

For the data conditioning for the target code see FB FEVAN. ( 3−195)

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