Siemens KF Series Bedienungsanleitung PDF herunterladen (Seite 2)

| | |

[ | |

| |BPOS: FW006 |

| |OUT OP SCREEN |

| | NUMBER |

| | 17-32 FW6 |

| | |

[ | |

| +--------------------+

Algorithm

The algorithm can be reduced to as follows:

1) Check the screen number for a valid number (zero is not a valid screen number).

2) Subtract the offset from the lower byte of the screen number word.

3) Perform a range check.

4) Left shift a '1' by the calculated amount.

Note that in a Siemens S5 PLC, the 'DO' instruction can be used to modify the operation of

the instruction following.

FB Source Code

FB212

Michael Griffin 1998

Convert the screen integer number to a binary pattern (0 - 15).

SCNO - Integer number representing the screen number.

OFST - Offset to subtract from actual screen number.

BPOS - One bit is set in this word which represents SCNO with

bit 0 indicating screen 1, and bit 15, screen 16.

(e.g. SCNO=4, BPOS=0000 0000 0000 1000).

SEGMENT 1

NAME: SCRNUM

DECL: SCNO I, W ;Screen number input.

DECL: OFST D, KF ;Screen number offset.

DECL: BPOS Q, W ;Output screen indicator.

: ;RESET DEFAULTS

: L KH 0000

: T FW254 ;Reset a scratch word.

: T =BPOS ;Reset the result.

: L =SCNO ;Load the screen number.

: !=F ;Is it equal to zero?

: BEC ;If so, exit.

: L KH 00FF ;Mask off the upper byte,

: AW ;lower byte contains screen number.

: LW =OFST ;Subtract the screen offset.

: -F

: D 1 ;Change range from 1-16 to 0-15.

: L KF +15 ;Is it greater than 15?

: >F ;If so, then exit.

: BEC

: TAK

: L KF +0 ;Is it less than 0?

: <F ;If so, then exit.

: BEC

: TAK

: T FY255 ;else, transfer it to a scratch word.

: L KH 0001 ;Convert this to a bit position.

: DO FW254

: SLW 0

: T =BPOS ;Transfer the result to the output.

: BE

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