Rockwell-automation 1747-PCINT API Software for 1746 I/O Manual de usuario Pagina 120
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6–66 Library of Routines OC_SetHostWatchdog
Publication 1747-6.5.3 June 1998
OC_SetHostWatchdog OC_SetHostWatchdog sets the host-to-scanner watchdog delay and mode of the
scanner.
Syntax:
int OC_SetHostWatchdog(HANDLE handle, int mode, WORD delay);
Parameters:
Description
Once the Host Watchdog is enabled, the host application must call OC_PetHostWatchdog more often than
the time specified as the watchdog timeout. If the host application does not call OC_PetHostWatchdog for
a time longer than the watchdog timeout, then the action specified by
mode
is performed.Return Value
Return Value:
Considerations:
Supported in the DOS API library and the Windows NT API library
Example:
HANDLE Handle;
int retcode;
retcode = OC_SetHostWatchdog(Handle, WATCHDOG_IDLE, 10 );
/* Watchdog times out in 1 second and places scanner in idle mode */
Parameter: Description:
handle
Must be a valid handle returned from OC_OpenScanner
mode
If mode is:
WATCHDOG_IGNORE the host-to-scanner watchdog is
disabled (default)
WATCHDOG_IDLE a watchdog timeout causes the scanner to fault.
The status LED is set to flashing red, the I/O is
reset, I/O scanning stops, and internal scanner
error of 0x0B is set, and the major error code is
set to 0x40. Use OC_ClearFault before the
scanner can be set to Scan mode
delay
Specifies the watchdog timeout in multiples of 100ms and can have any
value from 1 (100ms) to 65535 (6553.5s).
Name: Value: Description:
SUCCESS
0
host watchdog was set successfully
ERR_OCACCESS
2
handle does not have access to scanner
ERR_OCINIT
5
scanner has not been initialized, see OC_InitScanner
ERR_OCPARAM
8
parameter contains invalid value
- 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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