Rockwell-automation 1747-PCINT API Software for 1746 I/O Manual de usuario Pagina 79
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OC_GetInputImage UpdateCounter Library of Routines 6–25
Publication 1747-6.5.3 June 1998
OC_GetInputImage
UpdateCounter
OC_GetInputImageUpdateCounter reads the value of the input image update
counter from the scanner and places it into count.
Syntax:
int OC_GetInputImageUpdateCounter(HANDLE handle, BYTE *count);
Parameters:
Description:
The input image update counter is incremented by the scanner after each input scan.
The input image update counter is only incremented if the scanner is in Scan mode, input scans are enabled,
and inputs are present. Use the counter to determine whether a change occurred; the value of the counter is
not important. It is possible to configure a system with no inputs; in this case, the input image update counter
would not be incremented.
Return Value:
Considerations:
Supported in the DOS API library and the Windows NT API library
Example:
HANDLE Handle;
BYTE count;
int retcode;
retcode = OC_GetInputImageUpdateCounter( Handle, &count );
Parameter: Description:
handle
Must be a valid handle returned from OC_OpenScanner
count
Contains the value of the input image update counter
Name: Value: Description:
SUCCESS
0
input image update counter was read successfully
ERR_OCACCESS
2
handle does not have access to scanner
ERR_OCINIT
5
scanner has not been initialized, see OC_InitScanner
- 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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