Rockwell-automation 1747-PCINT API Software for 1746 I/O Manual de usuario Pagina 105
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Valorado. / 5. Basado en revisión del cliente
OC_PollScanner Library of Routines 6–51
Publication 1747-6.5.3 June 1998
The data returned in the MsgData member array depends upon the value in MsgID:
Separate queues hold messages received from each source. The host application must call OC_PollScanner
periodically to read messages from each enabled source to prevent messages from being discarded. If a
message queue is full when a new message is received, the oldest message is discarded and the next call to
OC_PollScanner results in a return value of ERR_OCOVERRUN. The queue can hold as many as
five messages.
Return Value:
Considerations:
Supported in the DOS API library and the Windows NT API library
Example:
HANDLE Handle;
MSGBUF msgbuf;
int retcode;
retcode = OC_PollScanner( Handle, OCMSG_ANY, &msgbuf );
/* Check msgbuf.MsgID for what message is available */
This MsgID: Returns:
MsgID=OCMSG_IOINT
MsgData[0]slot number that generated the interrupt
MsgID=OCMSG_DIINT
MsgData[0]mask of last bit transition that generated the interrupt
MsgData[2]lowbyte of count of matches that generated the interrupt
MsgData[3]highbyte of count of matches that generated the interrupt
MsgID=OCMSG_EOS_DMDIN
MsgID=OCMSG_EOS_DMDOUT
MsgID=OC_EOS
MsgData[0]number of scans that occurred since the last end-of-scan
message of this type was read
Name: Value: Description:
SUCCESS
0
scanner was polled successfully
ERR_OCACCESS
2
handle does not have access to scanner
ERR_OCOVERRUN
16
a message has been discarded
- API Software for 1
- 1746 I/O PCI 1
- Interface 1
- Allen-Bradley 1
- Important User 2
- Information 2
- Using This Manual 3
- Preface–2 Using This Manual 4
- Table of Contents 5
- Configuring I/O 6
- Chapter 5 6
- Error Codes Appendix A 7
- Overview 9
- The 1746 I/O PCI 10
- Interface API 10
- Understanding 11
- Architecture 11
- 1–4 Overview 12
- Installing the 13
- Windows NT API 14
- Installation Details 15
- 1–8 Overview 16
- Using the API 17
- DOS Considerations 18
- 2–4 Using the API 20
- 2–6 Using the API 22
- Developing Applications 27
- Programming 28
- Sequence 28
- Initialize the scanner 29
- Configure the scanner 29
- 3–4 Developing Applications 30
- Scan I/O 31
- Example for DOS 32
- Developing Applications 3–7 33
- 3–8 Developing Applications 34
- Developing Applications 3–9 35
- 3–10 Developing Applications 36
- Developing Applications 3–11 37
- Example for 38
- Windows NT 38
- Developing Applications 3–13 39
- 3–14 Developing Applications 40
- Developing Applications 3–15 41
- 3–16 Developing Applications 42
- Developing Applications 3–17 43
- 3–18 Developing Applications 44
- Developing Applications 3–19 45
- 3–20 Developing Applications 46
- Using the API Structures 47
- Configuring I/O Modules 49
- 5–2 Configuring I/O Modules 50
- Using M0-M1 Files 51
- Supported I/O 52
- 5–6 Configuring I/O Modules 54
- Library of Routines 55
- OCIOCFG structure 61
- Return Value: 101
- Considerations: 101
- Example: 101
- MsgFilter 104
- MsgFilter is: 104
- WORD len); 111
- of the module in the slot 113
- and len are ignored 113
- Description: 115
- (*callback)() ); 129
- This example is for DOS only 130
- Parameters: 142
- Appendix 147
- Extended Error 148
- B–2 Testing Function Calls 152
- Publication Problem Report 153
- BUSINESS REPLY MAIL 154
- Worldwide representation 155
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