Rockwell Automation 61C346 4 Input 0-10V Analog Rail Module - Manual (Page 33)

4Ć11
4.2.3 DCS 5000/AutoMax Programming
When programming the Analog Rail module, it is recommended that
you monitor the state of the overĆrange and underĆrange bits for the
input channels. You can check the status of the appropriate bits
directly if they were defined in the configuration. You can also use the
BASIC expression AND with the variable name assigned to the input
channel to mask off the 12 bits of analog data and read the values in
the overĆrange and underĆrange bits. Any nonĆzero result means that
the value is out of range. See the following three statements for
examples of how to detect values out of range. Use the hexadecimal
values shown to mask off the analog data.
The value in the channel defined as CHANNEL_2 is either overĆrange
or underĆrange:
10000 RANGE_ERROR@ = CHANNEL_2 AND 3000H
The value in the channel defined as CHANNEL_2 is overĆrange:
11000 OVER_ERROR@ = CHANNEL_2 AND 1000H
The value in the channel defined as CHANNEL_2 is underĆrange:
12000 UNDER_ERROR@ = CHANNEL_2 AND 2000H