Indicator Color Status Meaning
LINK/ACT Yellow Lit. The link was established.
Flashing The link is established, and data communications are in progress.
Not lit. A link was not established.
• The cable is not connected.
• The power supply is OFF or the CPU Unit was reset.
l
Built-in EtherCAT (Port 3) Status Indicators
These indicators show the operation status of the built-in EtherCAT port of the CPU Unit.
Indicator Color Status Meaning
NET RUN Green Lit. EtherCAT communications are in progress.
• Inputs and outputs for I/O data are in operation.
Flashing EtherCAT communications are established.
This indicator shows either of the following conditions.
• Only message communications are in operation.
• Only message communications and I/O data inputs are in op-
eration.
Not lit. EtherCAT communications are stopped.
• The power supply is OFF or the CPU Unit was reset.
• A MAC address error, communications Controller error
, or oth-
er error occurred.
NET ERR Red
Lit. A hardware error or unrecoverable error occurred, such as for
exception processing.
Flashing A recoverable error occurred.
Not lit. There are no errors.
LINK/ACT Yellow Lit. A link is established.
Flashing Data communications are in progress after establishing link.
Flashes every time data is sent or received.
Not lit. The link was not established.
3-1-5
Terminal Blocks
The terminal blocks on the CPU Unit are removable screwless clamping terminal blocks that allow you
to easily connect and remove the wiring.
Connect the Unit power supply and ground lines to the screwless clamping terminal block.
3 Configuration Units
3-9
NX-series NX502 CPU Unit Hardware User's Manual (W629)
3-1 CPU Units
3
3-1-5 Terminal Blocks
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