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Siemens SIMATIC S5-95U - Page 30

Siemens SIMATIC S5-95U
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Point-To-Point Link S5-95U, Second Serial Interface
:L KF +72
:L FW 252 Scan to determine whether all 32 DW have
:!=F already been copied
:JC =M002 then jump to receive mailbox enable
:L FW 252 otherwise, data word numbers are
:ADD KF +1 incremented by 1
:T FW 252
:L FW 254
:ADD KF +1
:T FW 254
:JC =M003 and next data word is copied
:
M002 :AN F 61.7 Enable receive mailbox again for
:S F 61.7 new frame
:
M001 : Send data
==============================================
:AN F 1.0 if no request to send,
:BEC end
:
:O F 1.1 if transmitting disabled or
:O F 62.7 if send request active then
:JC =M004 jump to pulse edge evaluation ”Send ready”
:
:AN F 1.1 Disable transmission since the send mailbox
:S F 1.1 must not be changed during transmission
:L KY 64.1 Enter frame length (here = 64 bytes) and
:T DW 80 destination number (here = 1 for slave 1) in
: 1st DW of the send mailbox
: Net data must be entered in DW 81 to DW 112
: at this point.
:AN F 62.7
:S F 62.7 Enable transmitting in the KBS and
:R F 1.2 reset edge auxiliary flag
M004 : Pulse edge evaluation ”Transmission terminated”
:AN F 62.7 if KBS bit 7 changes from 1 to 0 and
:AN F 1.2 edge auxiliary flag is not set,
:= F 1.3 Edge ”Transmission terminated”
:U F 1.3 in case of negative edge,
:S F 1.2 set auxiliary flag again
:
:A F 1.3 If transmission terminated and
:AN F 62.0 no errors have occurred during transmission,
:R F 1.0 reset send initiation bit,
:R F 1.1 reenable transmission
:
:A F 1.3 If transmission terminated and
:A F 62.0 errors have occurred during transmission,
:R F 1.1 enable transmission for repeat
:BE
DescriptionFB100 AWL (continued)
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2-10
EWA 4NEB 812 6095-02

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