Behavior For Power Supply Interruptions; Behavior In Voltage Drop; Automatic Recovery From Voltage Drops - Omron DeviceNet Safety NE0A Series Operation Manual

Behavior for Power Supply Interruptions

8-5

Behavior for Power Supply Interruptions

8-5-1

Behavior in Voltage Drop

Low Power Supply Voltage for the Internal Circuits
Low Power Supply Voltage for Output Circuits
Method 1: Using the Network Configurator for Monitoring
Method 2: Using DeviceNet Communications for Monitoring General Status
8-5-2

Automatic Recovery from Voltage Drops

Power Supply Voltage for the Internal Circuits
Power Supply Voltage for the Output Circuits
108
If the power supply voltage for the internal circuit drops to 20.4 V or lower, the
NE0A-series Controller will turn OFF the outputs.
If the power supply voltage for outputs drops to 20.4 V or lower when the
power supply voltage for the internal circuit is normal, the NE0A-series Con-
troller will continue operation but will stop refreshing outputs.
The OUT PWR indicator or the I/O power supply monitor function of the
NE0A-series Controller can be used to check whether the output power sup-
ply voltage is being supplied.
Refer to 9-1-1 Monitoring Status and 9-1-4 Monitoring Error History.
General Status can be monitored with DeviceNet communications using
safety I/O, standard I/O, or explicit message communications. For details,
refer to 6-5 Remote I/O Allocations and Appendix B DeviceNet Explicit Mes-
sages.
If the power supply recovers (to 20.4 V or more) after 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 NE0A-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 20.4 V or lower, and operation (2) occurs if the power supply
fluctuates around the lower operation limit of the internal power/voltage detec-
tion circuit.
I/O refreshing is automatically restarted when the power supply is recovered
(to 20.4 V or more). The I/O power monitor error is also automatically can-
celed.
Section 8-5