Advantech I/O Module 5000 Series User Manual page 51

Analog Input module
Setting Initial Counter Value
In order to utilize the alarm function, users have to set a high-alarm limit
value and/or a low alarm limit value, and a initial value to fulfill the
requirements for a basic alarm setting.
Figure 4-34: Sending Alarm Signal (recommended settings)
Figure 4-35: Sending Alarm Signal (settings not recommended)
Overflow Value
Overflow value is the number of times the counter value exceeds the
Max/Min values you specified. When the counter value exceeds Maxi-
mum value, the overflow value increases; when the counter value goes
under Minimum value, the overflow value decreases. Besides, when the
counter value runs beyond the range of Max/Min value, it will continue
counting from the initial value. Furthermore, if users want to check the
counter value to see if it is higher or lower than the Max/Min value, they
can use the "ReadOverflowFlag" library to gain a readout of the over-
flow value.
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