Siemens EF 83H Series Instrukcja Użytkownika Pobierz pdf (Strona 131)

Configuration Examples

6-24

SIMATIC 505 PROFIBUS-FMS CP User Manual

Example of a Send-Receive Job (continued)

The

Relay Ladder Logic example in Figure 6-17 demonstrates a typical

scenario for enabling a Receive acknowledgement. This section assumes

that you are familiar with Series 505 programmable logic controller

language. The WX and WY locations used in this RLL example correspond

to module I/O addresses that have been configured in programmable logic

controller memory using the Configure I/O function.

The logic shown in Figure 6-17 performs as described in T

able 6-2:

able 6-2

Description of Receive Logic

C49 Enables condition logic, defined by the application (Xn), which

must remain active until job completion.

MOVW1 Sets status word V302 to a positive value (1) prior to each

transaction. This positive value is used for job completion check in

CMP1.

BITP1/BITP2 Ensures that no pending jobs exist prior to starting a Receive job

defined for Bit 3 of FMS CP module, located at I/O address WY7.

BITC1 Clears the job defined for Bit 3 of the FMS CP module located at

WY7 after the Job Active bit WX3 is set.

BITS1 Sets the Job Start Bit defined for Bit 3 of the FMS CP module

located at WY7 to invoke a data transfer function.

CMP1 Tests the completion status of the data transfer by the same FMS

CP module, placed in V302, against a zero constant stored at

location V25. When the Peer job has completed, the value of

status word V302 is zero—good transaction—or a non-zero

value—the corresponding SEND job has not executed or some

other error has occurred (see T

able B-1 and T

able B-4). You must

take appropriate action in the USER ERROR CONTROL LOGIC

ladder rung at this time. If the job is to be executed only one time,

you take must take action to disable Xn after the Status word

changes value from its preset condition.

C31/C33 The parallel net of C31 and C33 act together to start and hold

TMR1 on until either the FMS CP recognizes that the Job Start

bit WY7.3 has been set and responds by setting the Job Active bit

WX3.3 or else TMR1 time expires.

TMR1

BITC2

TMR1 and BITC2 are used to clear an unrecognized Job Start bit

WY7.3. Either a reset of the CP or a power cycle of the entire

base may cause the programmable logic controller ladder to set a

WY Job Start bit prior to FMS CP recovery. When this condition

occurs, the FMS CP module does not execute the job (see the note

on page 4-5).

Example

RLL Code

for Receive Job at

Station 5

1 2 ... 126 127 128 129 130 131 132 133 134 135 136 ... 186 187

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