GE 845 User Manual

CHAPTER 4: SETPOINTS TESTING
845 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL 4–359
Ethernet Loopback Test
This section specifies the Ethernet Loopback test function for Port 4 and Port 5.
The Ethernet Loopback test can only be initiated in Factory Service mode by using either
the Front Panel or a Modbus client. The user can specify the number of iterations for the
test and the status of the test. Pass and fail counters are made available through the Front
Panel and a Modbus client only when Factory Service mode is enabled (under
Setpoints >
Device > Security). The test transmits an alternating pattern to ensure the data is always
changing and checks if it is properly received. The user must provide an external loop-back
connection for each port during the test.
Path: Setpoints > Factory > Loopback Test > Port 4 (5)
NUMBER OF TESTS
Range: 0 to 65535 in steps of 1
Default: 500
This setting is used to enter the number of iterations of the loop-back test.
TEST START
Range: No, Yes
Default: No
This setting is used to initiate the test when the command is set to “Yes”.
ACTUAL VALUES
TEST STATUS
Range: None, Testing, Passed, Failed
Default: None
This value indicates the result of the test.
TESTS RUN
Range: 0 to 65535 in steps of 1
Default: 0
The remaining test iterations once the loop-back test has been initiated.
TESTS PASSED
Range: 0 to 65535 in steps of 1
Default: 0
This actual values indicates how many iterations have passed.
TESTS FAILED
Range: 0 to 65535 in steps of 1
Default: 0
This actual value indicates how many iterations have failed.
NOTE
NOTE:
If the loop-back test is successful the Tests Passed counter will be equal to the Number of
Tests that were specified. In addition, the Test Status can be read to determine the result of
the test.
Steps required to initiate an Ethernet Loopback test
1. Enable Factory Service Mode
2. Write the “Number of Tests” register. The default is 500, and there is usually no need to
change it.
3. Initiate the test by Writing 1 for “Yes” to the “Test Start” command.
4. Read the “Tests to Run” register. Once it is 0 the test is complete.

GE 845 Specifications

General

Brand	GE
Model	845
Category	Protection Device
Language	English