Omron SMARTSLICE - 04-2008 Operation Manual page 94

Other Errors
Status
The NS indicator lights green
but changes to red after a
short time.
OR
The NS indicator lights green
but flashes red after a short
time.
The NS indicator remains
OFF.
The NS indicator continuously
flashes green.
Check the following points and then restart the faulty Slave.
• Verify that there are 121-Ω Terminating Resistors connected at both ends of the trunk
line. Connect 121-Ω Terminating Resistors if the resistance is not correct.
• Check whether the baud rates match on the Master and all Slaves.
If there are any Slaves with different baud rates, set them to the same baud rate.
• Check whether all of the Slaves' settings are correct.
• Check whether the communications cables are connected properly.
• Check whether the power supply is set correctly and the power supply cables are con-
nected properly.
• Check all the nodes for broken wires in the communications and power supply cables
attached to the connectors.
• Check whether communications power is correctly supplied to the network.
• If there is nearby equipment that generates electrical noise, take steps to shield the Mas-
ter, Slaves, and communications cables from the noise.
• If an error has occurred in a network with an OMRON Master Unit, refer to the DeviceNet
master operation manual.
If an error has occurred in a network with a another company's Master Unit, refer to the
relevant operation manual.
• If a particular Slave's NS indicator is always red, replace that Slave.
• Check whether the baud rates match on the Master and all Slaves.
If there are any Slaves with different baud rates, set them to the same baud rate.
• Check that the Slave's connector is connected correctly.
• Check that the 24 VDC communications power supply is being supplied properly.
• Check that the Master is operating properly.
When using an OMRON Master Unit, refer to the DeviceNet master operation manual.
If another company's Master is being used, refer to the relevant operation manual.
• Check whether the communications cables are connected properly.
• Check whether the power supply is set correctly and the power supply cables are con-
nected properly.
• Check for broken wires in the communications and power supply cables attached to the
connectors.
• Check that the Master is operating properly.
When using an OMRON master, refer to the DeviceNet master operation manual.
If another company's Master is being used, refer to the relevant operation manual.
• Check whether the Slave is registered in the Master's scan list.
If an OMRON Master Unit is being used, a new Slave cannot be added to the network if
the Master is operating with the scan list enabled. First clear the scan list, check that all
the Slaves have joined the network, and then create the scan list.
If another company's Master is being used, refer to the relevant operation manual for
details on registering a new Slave in its scan list.
Likely cause and remedy
Section 6-4
75