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Neuron C Reference Guide 15
nvoHumidity3;
...
nvoHumidity2 = 32;
...
when (nv_update_succeeds(nvoHumidity1 .. nvoHumidity3))
{
...
}
offline Event
The offline event evaluates to TRUE only if the device is online and an
Offline
network management message is received from a network tool, or when a
program calls go_offline( ). The offline event is handled as the first priority when
clause. It can be used in no more than one when
clause in a program.
The offline state can be used in case of an emergency, for maintenance prior to
modifying configuration properties, or in response to some other system-wide
condition. After execution of this event and its task, the application program
halts until the device is reset or brought back online. While it is offline, a device
can respond to certain messages, but only
Reset
or
Online
messages from a
network tool are processed by the application. For example, network variables on
an offline device cannot be polled using a network variable poll request message
but they can be polled using a
Network Variable Fetch
network management
message.
If this event is checked for outside of a when clause, the programmer can confirm
to the scheduler that the application program is ready to go offline by calling the
offline_confirm( ) function (see
Going Offline in Bypass Mode
in Chapter 7,
Additional Features
, of the
Neuron C Programmer's Guide
).
When an application goes offline, all outstanding transactions are terminated.
To ensure that any outstanding transactions complete normally before the
application goes offline, the application can call flush_wait( ) in the when(offline)
task.
Syntax
offline
Example
when (offline)
{
flush_wait();
// process shut-down command
}
when (online)
{
// start-up again
}
- C Reference Guide 1
- Welcome 3
- Audience 3
- Related Documentation 3
- ONWORKS Platform 4
- Table of Contents 7
- Neuron C Overview 19
- I/O objects 20
- Neuron C Programmer’s 20
- Predefined Events 21
- Bypass Mode 22
- Event Directory 23
- Variable 31
- Variables 32
- network-var2 34
- Compiler Directives 39
- Pragma Directives 40
- I/O Model Reference 43
- NodeBuilder User’s Guide 44
- Memory Management 44
- LonWorks 48
- ShortStack 48
- User’s Guide 48
- Other Directives 57
- Execution Control 61
- Network Configuration 62
- Integer Math 63
- Floating-Point Math 66
- Strings 68
- Utilities 68
- Input/Output 70
- Integer 72
- Binary Arithmetic Operators 73
- Unary Arithmetic Operators 74
- Comparison Operators 75
- Integer Conversions 76
- Signed 32-Bit Performance 77
- String 85
- Floating-Point Performance 87
- Translator 89
- Function Directory 89
- Control Network Specification 90
- xxx 96
- Example 100
- General 112
- Example 1 116
- Example 2 116
- Function 140
- Additional Features 140
- Query Status 145
- Timer Declarations 177
- Timer Object 178
- Property, and Message Tag 179
- Declarations 179
- Introduction 180
- Neuron C Programmer’s Guide 186
- Device Property Lists 186
- (connection-info) 187
- Message Tags 196
- Related Data Structures 205
- Built-In Variables, Objects 209
- Symbols, and Semaphore 209
- Built-In Variables 211
- Control Network Protocol 217
- Built-In Objects 218
- Built-In Symbols 220
- Built-In Semaphore 221
- Syntax Summary 223
- Syntax Conventions 224
- Variable Declarations 225
- Declaration Specifiers 225
- Type Keywords 226
- Storage Classes 227
- Type Qualifiers 227
- Enumeration Syntax 227
- Structure/Union Syntax 228
- Connection Information 229
- Declarator Syntax 230
- Abstract Declarators 231
- Task Declarations 232
- Function Declarations 232
- Conditional Events 233
- Complex Events 233
- I/O Object Declarations 234
- I/O Options 235
- Property List Declarations 237
- Statements 238
- Expressions 239
- Functions 242
- Implementation Limits 243
- Reserved Keywords 245
- Reserved Words List 246
- 236 Index 256
- 238 Index 258
- 240 Index 260
- 242 Index 262
- 244 Index 264
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