Motorola V186 User Manual - Page 37
Hardware Test.
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Analog Input Modules In the event of AI Module failure, the I/O module ERR LED will be lit. The event is registered by the CPU in the Error Logger. AI Module failure status is also visible to the user application program. In addition to the ERR LED, the module includes an Underflow (UDF) and Overflow (OVF) LED for each input. When the UDF LED is lit, it indicates that the signal level in the corresponding input is below the nominal range. When the OVF LED is lit, this indicates that the signal level in the corresponding input is above the nominal range. If both the UDF and OVF LEDs of the same channel are lit, the channel is uncalibrated. The AI module can be diagnosed and monitored using the STS Hardware Test utility. The Hardware Test verifies that the module is operational, presents the module configuration and shows the actual value of each input, including overflow and underflow. It is also possible to change the input filter setup for the duration of the Hardware Test. In the Hardware Test utility, it is possible to set the AI module to Freeze Mode. In this mode, the program user will get the KLV or PDV of each input in the module instead of the actual input value. Freeze mode enables testing the inputs while the user application program is running. 33