186
Behavior for Power Supply Interruptions
Section 8-2
8-2
Behavior for Power Supply Interruptions
8-2-1
Behavior in Voltage Drop
Low Power Supply Voltage for the Internal Circuits
If the power supply voltage for the internal circuit drops to 85% of the rated
voltage or lower, the NE1A-series Controller will turn OFF the outputs.
Low Power Supply Voltage for I/O Circuits
If the power supply voltage for input drops to 85% of the rated voltage or lower
when the power supply voltage for the internal circuit is normal, the NE1A-
series Controller will continue operation but will stop refreshing inputs. Simi-
larly, if the power supply voltage for output drops to 85% of the rated voltage
or lower, the Controller will continue operation but will stop refreshing outputs.
The I/O power supply monitor function of the NE1A-series Controller can be
used to monitor the I/O power supply voltage to confirm if it is normal.
8-2-2
Automatic Recovery from Voltage Drops
Power Supply Voltage for the Internal Circuits
If the power supply is recovered (to 85% of the rated voltage or more)
because of a fluctuation in the power supply voltage, the following might
occur:
1. Operation will automatically restart or
2. A critical error will occur, which will require cycling the power supply to re-
start operation.
These operations occur because the NE1A-series Controller’s operation
becomes unstable and it detects a self-diagnosis error. Operation (1) occurs if
the power supply to the Controller is completely stopped because the power
supply voltage is 85% of the rated voltage or lower, and operation (2) occurs if
the power supply fluctuates around the lower operation limit of the internal
power/voltage detection circuit.
Power Supply Voltage for the I/O Circuits
I/O refreshing is automatically restarted when the power supply is recovered
(to 85% of the rated voltage or more). The I/O power monitor error is also
automatically canceled.
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...