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Description of the DP Functions, Data, and Error Codes

DP Base Programming Interface for CP 5613/CP 5614

102

C79000-G8976-C108-01

4.1.18 DP_enable_event

Purpose

Calling this function means that the following important events (software events) on

the DP master can be signaled explicitly to the DP application:

Diagnostic data, alarms and status messages can be fetched

Slaves are included in the cyclic DP processing

(operational) or have dropped out

The mode of the master has changed

The function does not wait for the events but simply registers its program for

notification. To fetch the events, use DP_get_result.

Note 1

By calling this function, your user program simply indicates that it is ready to

receive the specified event type. The actual event message must be fetched with

DP_get_result.

Note 2

When a DP_enable_event confirmation is received (see DP_get_result), the

DP_enable_event function must be called again, if the user program wants to be

informed of new events. The events DP_DIAG_ALARM and DP_SLV_STATE are

buffered in the time between receiving the confirmation and calling

DP_enable_event again so that they are not lost.

Note 3

When you first call DP_enable_event with the DP_SLV_STATE selector activated,

note the following points:



If slaves are operable at the time of the call (READY state), the event message

DP_SLAVE_ENTER is triggered immediately for these slaves.



If no slaves are operable at the time of the call (NOT READY state), no

DP_SLAVE_EXIT event message is triggered.

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