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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
Summary of Contents for NE1A-SCPU01 - 07-2009
Page 3: ...iv...
Page 9: ...x TABLE OF CONTENTS...
Page 11: ...xii...
Page 15: ...xvi...
Page 70: ...35 Installation Section 3 1 Top Top Bottom Bottom...
Page 72: ...37 Installation Section 3 1 3 1 3 Dimensions and Weight Dimensions NE1A SCPU01 V1...
Page 85: ...50 Wiring Section 3 2...
Page 123: ...88 Explicit Message Communications Section 4 7...
Page 141: ...106 Safety Outputs Section 5 4...
Page 257: ...222 Connection Status Tables Section 10 8...
Page 261: ...226 NE1A series Controller Replacement Section 11 2...
Page 264: ...229 Appendix A Local Input and Test Output Setting Example Local Output Setting Example...
Page 266: ...231 Appendix A Programming Example Local Input and Test Output Setting Example...
Page 267: ...232 Appendix A Local Output Setting Example...
Page 269: ...234 Appendix A Programming Example Local Input and Test Output Setting Example...
Page 270: ...235 Appendix A Local Output Setting Example...
Page 273: ...238 Appendix A Local Input and Test Output Setting Example Local Output Setting Example...
Page 275: ...240 Appendix A Programming Example Local Input and Test Output Setting Example...
Page 276: ...241 Appendix A Local Output Setting Example...
Page 289: ...254...
Page 293: ...258 Index...