Checking Errors; Figure 8-4 Err Leds Of The J.net Module; Table 8-4 Location Of Problem For Lighting Err Led, And Corrective Actions - Hitachi J.NET User Manual

8. Test and Maintenance Diagnosis

8.4 Checking errors

If an error is detected during the Test and Maintenance operation, the ERR LED of the J.NET module turns on.
If the Test and Maintenance operation results in the ERR LED turning on, the J.NET module or the CPU
module might have failed. Replace the module if it has failed. The method of determining which module has
failed differs depending on the test item implemented. See Table 8-4. To check more details, connect the tool to
the CPU unit, and then check the address indicated in Table 8-5.
For details about the tool, see the S10VE User's Manual General Description (manual number SEE-1-001).
ERR LED

Table 8-4 Location of problem for lighting ERR LED, and corrective actions

T/M1 and T/M2 J.NET module error
T/M3
T/M4
LQE540-E

Figure 8-4 ERR LEDs of the J.NET module

Test item Possible problem location
J.NET module error
CPU module error
J.NET module error
Improper wiring
J.NET
A
B
Corrective action
Replace the J.NET module.
Replace the J.NET module.
Replace the CPU module.
Replace the J.NET module.
Correct the wiring.
8-6