DESCRIPTION AND OPERATION
SECURITY AND INTEGRITY CHECKS
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I-E96-301B
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Diagnostics Run in Diagnostic Mode
The IMASI03 performs built-in tests in diagnostic mode to
check the operation of the module. These tests include:
•
Sixteen channel reference checks.
•
A/D internal reference checks.
•
Switch test.
•
Watchdog timer test.
•
CPU test.
•
Timer test.
•
ROM test.
•
DPRAM test.
•
NVRAM test.
•
SRAM test.
•
System reference checks.
•
Configured channel reference checks.
•
Unconfigured channel reference checks.
Diagnostics Run During Normal Operation
During normal operation, the IMASI03 verifies the checksum of
the PROM and nonvolatile RAM. Watchdog timers safeguard
against an A/D converter failure which would halt input scan-
ning. Input circuits are monitored for open circuits. Any errors
are reported to the master MFP through the slave module sta-
tus. Certain failures detected by these diagnostics may result
in halting the slave.
Expander Bus Communication Security
Expander bus message integrity is maintained by checksum
calculations on each transmitted and received message or data
set.
Open Input Detection
The IMASI03 recognizes and reports any open inputs on active
channels by indicating bad quality on these channels.
Alarm and Exception Reporting
No alarm or exception reports are generated by the function
codes associated with the IMASI03. The values input from the
IMASI03 must be fed to a standard exception reporting block.
Refer to
for more information.
