Siemens EF 83H Series Manual do Utilizador descarregar pdf (Página 134)

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

WX3.3

t1t0

Figure 6-19

Unsuccessful T

iming Example

The list below explains the sequence of events.

Send job RLL requests that a data transfer be invoked.

Programmable logic controller sets WY5.3 low

before

seeing WX1.3 go

high. (RLL code prematurely resets WY5.3 to zero.)

WX1.3 never goes high; that is, the job never starts and no data is sent.

Receive job RLL requests that received data be processed and stored.

Receive Job Active bit is set active by the FMS CP

. However

, no data

was sent.

Receive job Start Bit is reset to inactive by Receive job RLL in response

to FMS CP Job Active bit.

Receive job has completed but no data was received. Receive job resets

Job Active bit and stores job status E0E0 instead of 0.

Unsuccessful

iming Example

1 2 ... 129 130 131 132 133 134 135 136 137 138 139 ... 186 187

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