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Diagnostics
• Power.
• Redundancy.
• Local I/O.
• Station.
Also, status information can be acquired directly from the I/O
device definition function code and the I/O channel function
codes using FC 226 (test status). Refer to Test Status (FC 226)
Test Status (FC 226)Test Status (FC 226)
Test Status (FC 226)
in Section 6 for further description.
Diagnostics
The I/O block firmware contains various diagnostic routines
used to verify proper operation of components and circuitry.
Some are run automatically during startup (online) and others
can be invoked manually (offline).
Online
An I/O block runs the following online diagnostic checks dur-
ing startup:
• Hnet.
• Data converters (D-to-A and A-to-D).
• I/O channel bus.
• Memory.
• Power status.
• Voltage references.
If any of these checks detect a hardware problem, the I/O
block will provide error status code indications (if possible) and
the block will halt. Refer to Table 8-3 to decipher the status
codes.
Offline
The offline tests can be run to verify operation of a suspect I/O
block or to check block integrity after installation. The offline
diagnostics should only be run during installation or when the
system is down. Refer to procedure section PR24 for the steps
to run offline diagnostics.
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