8. Test and Maintenance Diagnosis
8-1
8. Test and Maintenance Diagnosis
8.1 Details of Test and Maintenance diagnosis
Table 8-1 describes details of Test and Maintenance diagnosis for a J.NET module. You can select between four
types of Test and Maintenance by using the MODU No. and BIT RATE setting switches on the J.NET module.
For details about how to start Test and Maintenance, see
8.3 Starting Test and Maintenance
.
Table 8-1 Details of Test and Maintenance diagnosis for J.NET modules
No.
Test item
Diagnosis
Wiring
required?
1
T/M1
Internal loopback check
Use this function to perform loopback between NET1 and
NET2 internally to confirm that data can be transmitted and
received normally.
No
2
T/M2
Internal memory compare check
Use long word, word, and byte accordingly as the unit to
compare with the internal memory of the J.NET module,
and check for consistency.
No
3
T/M3
CPU memory compare check
From the J.NET module, use word as the unit to compare
with the internal memory of the CPU module, and check for
consistency.
No
4
T/M4
External loopback check
Use this function to perform loopback between NET1 and
NET2 externally (by wiring NET1 and NET2 together) to
confirm that data can be transmitted and received normally.
Yes
Note: To enable the diagnosis result of a test item with wiring necessity being
Yes
, perform wiring according to
8.2
Wiring method
, and then start Test and Maintenance.
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