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CIP API Functions ControlLogix Platform ♦ "C" Programmable

Developer's Manual Linux Application Development Module

Page 94 of 264 ProSoft Technology, Inc.

March 12, 2014

fromSlot is the slot number in the local rack from which the message was

received. If the module in this slot is a communications bridge, then it is

impossible to determine the actual originator of the message.

msgHandle is only needed if the callback returns OCX_CIP_DEFER_RESPONSE. If this

code is returned, the message response is not sent until OCXcip_MsgResponse is

called.

Note: If the service_proc callback returns OCX_CIP_DEFER_RESPONSE, it must save

any needed data passed to it in the OCXCIPSERVSTRUC structure. This data is only

valid in the context of the callback. If the received message contains data, the

buffer pointed to by msgBuf can be accessed after the callback returns. However,

the pointer itself will not be valid.

Return Value

The service_proc routine must return one of the following values:

OCX_SUCCESS

message processed successfully

OCX_CIP_BAD_INSTANCE

invalid class instance

OCX_CIP_BAD_SERVICE

invalid service code

OCX_CIP_BAD_ATTR

invalid attribute

OCX_CIP_ATTR_NOT_SETTABLE

attribute is not settable

OCX_CIP_PARTIAL_DATA

data size invalid

OCX_CIP_BAD_ATTR_DATA

attribute data is invalid

OCX_CIP_FAILURE

generic failure code

OCX_CIP_DEFER_RESPONSE

defer response until OCXcip_MsgResponse is called

Example

OCXHANDLE Handle;

OCXCALLBACK service_proc ( OCXHANDLE objHandle, OCXCIPSERVSTRUC

*sServ )

{

// Select which instance is being accessed.

// The application defines how each instance is defined.

switch(sServ->instance)

{

case 1: // Instance 1

// Check serviceCode and attribute; perform

// requested service if appropriate

break;

case 2: // Instance 2

// Check serviceCode and attribute; perform

// requested service if appropriate

break;

default:

return(OCX_CIP_BAD_INSTANCE); // Invalid instance

}

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