Behavior For Power Supply Interruptions; Behavior In Voltage Drop; Automatic Recovery From Voltage Drops - Omron NE1A-SCPU01 - 2006 Operation Manual

Behavior for Power Supply Interruptions

8-2

Behavior for Power Supply Interruptions

8-2-1

Behavior in Voltage Drop

Low Power Supply Voltage for the Internal Circuits
Low Power Supply Voltage for I/O Circuits
8-2-2

Automatic Recovery from Voltage Drops

Power Supply Voltage for the Internal Circuits
Power Supply Voltage for the I/O Circuits
186
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.
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.
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.
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.
Section 8-2