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189
Operational Flow and Cycle Time
Section 9-2
9-2
Operational Flow and Cycle Time
The NE1A-series Controller’s operations are outlined here.
The NE1A-series Controller initializes itself internally when the power is
turned ON. Unless there are errors, the Controller then cyclically executes
system processing,
DeviceNet/USB communications processing, I/O refreshing, and user pro-
gram.
In Standalone Controller mode, the Controller cyclically executes all but the
DeviceNet processes. The cycle time depends on the scale of the user pro-
gram and the configuration of DeviceNet remote I/O communications.
Note
Approximately 6 s is required to complete initialization after the power is
turned ON. Initialization processing includes the self-diagnosis required for
the NE1A-series Controller to perform safety functions.
The cycle time is expressed by the following formula.
Controller cycle time = System processing time
+ DeviceNet/USB or USB communications time
+ I/O refresh time
+ User application execution time
The cycle time of the NE1A-series Controller is set in 1-ms increments
depending on the configuration. The cycle time can be checked from
the Network Configurator.
Note
After the NE1A-series Controller has started operating, DeviceNet connection
will be established and then devices will be verified to start DeviceNet safety
I/O communications. This process can take up to 2 s to be completed depend-
ing on the configuration (i.e., on the setting for the number of connections).
The following formula gives the time from the when the processing to estab-
Initialize
System processing
DeviceNet/
USB communications
processing
I/O refresh
User application
calculation
Cycle time
Initialize
USB communications
processing
I/O refresh
Normal mode flow
Standalone Controller mode flow
Power ON
Power ON
System processing
User application
calculation
Cycle time
Содержание NE1A-SCPU01 - 07-2009
Страница 2: ...NE1A Series Safety Network Controller NE1A SCPU01 V1 SCPU02 Operation Manual Revised September 2006...
Страница 3: ...iv...
Страница 9: ...x TABLE OF CONTENTS...
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Страница 15: ...xvi...
Страница 33: ...xxxiv Unit Versions of NE1A series Controllers 7 Click the OK Button This completes the procedure...
Страница 70: ...35 Installation Section 3 1 Top Top Bottom Bottom...
Страница 72: ...37 Installation Section 3 1 3 1 3 Dimensions and Weight Dimensions NE1A SCPU01 V1...
Страница 73: ...38 Installation Section 3 1 NE1A SCPU02 Weight Model Weight NE1A SCPU01 V1 460 g max NE1A SCPU02 690 g max...
Страница 85: ...50 Wiring Section 3 2...
Страница 123: ...88 Explicit Message Communications Section 4 7...
Страница 141: ...106 Safety Outputs Section 5 4...
Страница 257: ...222 Connection Status Tables Section 10 8...
Страница 258: ...223 SECTION 11 Maintenance and Inspection 11 1 Inspection 224 11 2 NE1A series Controller Replacement 225...
Страница 261: ...226 NE1A series Controller Replacement Section 11 2...
Страница 264: ...229 Appendix A Local Input and Test Output Setting Example Local Output Setting Example...
Страница 266: ...231 Appendix A Programming Example Local Input and Test Output Setting Example...
Страница 267: ...232 Appendix A Local Output Setting Example...
Страница 269: ...234 Appendix A Programming Example Local Input and Test Output Setting Example...
Страница 270: ...235 Appendix A Local Output Setting Example...
Страница 273: ...238 Appendix A Local Input and Test Output Setting Example Local Output Setting Example...
Страница 275: ...240 Appendix A Programming Example Local Input and Test Output Setting Example...
Страница 276: ...241 Appendix A Local Output Setting Example...
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Страница 293: ...258 Index...