Siemens EF 83H Series Manuel d'utilisateur Page 134

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Configuration Examples
6-27
SIMATIC 505 PROFIBUS-FMS CP User Manual
Figure 6-19
shows the sequence of events for an unsuccessful FDL
transaction.
WY5.3
WX1.3
t2 t4
SEND
RECEIVE
WY7.3
t3
WX3.3
t1t0
t5
a
Figure 6-19
Unsuccessful T
iming Example
The list below explains the sequence of events.
t0
Send job RLL requests that a data transfer be invoked.
t1
Programmable logic controller sets WY5.3 low
before
seeing WX1.3 go
high. (RLL code prematurely resets WY5.3 to zero.)
a
WX1.3 never goes high; that is, the job never starts and no data is sent.
t2
Receive job RLL requests that received data be processed and stored.
t3
Receive Job Active bit is set active by the FMS CP
. However
, no data
was sent.
t4
Receive job Start Bit is reset to inactive by Receive job RLL in response
to FMS CP Job Active bit.
t5
Receive job has completed but no data was received. Receive job resets
Job Active bit and stores job status E0E0 instead of 0.
Unsuccessful
T
iming Example
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