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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.
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