Yokogawa DR240 - Manual (Page 38)

4-9 IM DR231-11E
Overview and Specifications of Ethernet Interface
4
4.6 Checking the Connection (Loopback test)
Automatically tests the condition of the physical connection of the DR to the network.
Mode Setting
Set the dip switch of the Ethernet module to test mode (switch 1: OFF, switch 2: ON).
Functions of the Ethernet module are suspended while in test mode. Therefore, it’s necessary to set
the dip switch to communication mode after testing.
Note
• After testing, set the dip switch to communication mode and reboot the DR.
Test description
Sends a test packet to the network, and tests whether or not the sent packet can be received.
Testing
After connecting the DR to the network, turn ON the DR.
The connection test is automatically started.
Test Results
The test results are indicated by the LED on the Ethernet module.
Normal: STS1 is lit.
Error: STS1 and STS2 blinks alternately.
If the test result is abnormal
Connect the DR and PC through a hub, independent from the network, as described in “Connecting
only the DR and PC” (page 4-8) and test the connection status again.
If the result is normal: The problem is with the network. Consult your network administrator.
If the result is abnormal: The DR must be repaired.