Verifying The Communications Module Installation; Performing The Initial Diagnostic Checkout; Performing The Loopback Diagnostic Test; Figure 4-1 Mj-X - Siemens MJ-XL Installation Manual

6 Verifying the Communications Module Installation

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Once the MJ-X Communications Module is installed in the MJ-X
follows to ensure proper operation and performance.
1. Visually inspect the MJ-X
2. Apply power to the MJ-X
LED should light immediately and stay lit. After 10 to 15 seconds, the Watchdog LED should start flashing
without a long pause between flashes, that is, about twice per second.
If this does not occur, check for the following:
§ The MJ-X L
Control Panel is receiving power. Check that the front panel display is active.
§ The communications module is installed properly. Connections between the MJ-X
Communications Module are correct. Disassemble, inspect, and reassemble the unit as required.
3. After verifying that the communications module is receiving power, perform the diagnostic tests described on
the next page.

6.1 Performing the Initial Diagnostic Checkout

Prior to performing these tests, become familiar with operating and configuring the MJ-X
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MJ-X Voltage Regulator Control Panel Installation and Operations Manual (Siemens manual no. 21-115527-
010).
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1. On the MJ-X Control Panel, under the < DIAGNOSTICS > menu, go to the "CM Test:?" screen.
2. Press the Change key and toggle from "OFF" to "INTERN," and then press the Save key. (If the password is
requested, enter the password as described in the note below and proceed.) The "CM Test:?" screen should
display "INTERN" for several seconds before changing to "OFF." If the display does not change to "OFF,"
then check the physical installation of the communications module and expansion rack again before
proceeding.
Note: When you try to change the "CM Test:?" value, the MJ-X
be entered. If the default passwords are in effect, then the password for the Diagnostics menu is "3333." For
more information refer to the MJ-X
3. Once the "CM Test:?" screen value has returned to "OFF," press the down arrow key to display the next data
item, "CM TestStat." This screen indicates the status of the communication module test. A value of xxx3
(where x may be 0-9 or a-f), indicates that the test passed. A value of xxx0, xxx1, or xxx2 indicates a failure.
• xxx0 indicates the test did not run at all. Run the test again, allowing extra time for the communications
module to power up. This should take about 15 seconds. The Watchdog LED will blink after the module
successfully completes self test and initialization.
• xxx1 or xxx2 indicate an internal problem with the MJ-X
assistance.

6.2 Performing the Loopback Diagnostic Test

The loopback test evaluates the MJ-X
the receive input of the communications module. When testing the fiber optic module, ensure that the cable used
meets the requirements outlined in section 6.1. When testing the RS-232/485 module, only the RS-232 portion of
the circuit can be tested by connecting a wire from the transmit pin (Txd) to the receive pin (Rxd) of the screw
terminal block connector.
1. Scroll to the "CM Test:?" data item in the <DIAGNOSTICS> menu on the MJ-X
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Communications Module for proper mechanical assembly and cable connections.
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Control Panel and observe the LEDs on the communications module. The Power
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Installation and Operations Manual.
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for communications readiness. For this test, connect the transmit output to
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(MJ-X) control panel, test the module as
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Control Panel may request that the password
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Communications Module. Contact Siemens for
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Control Panel display.
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and the
Control Panel. See the