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5-98 Field Control™ Genius® Bus Interface Unit User’s Manual
–
October 1999 GFK-0825F
5
The low span value is displayed next. This is the actual current in microAmps that a channel will
output when the low engineering units value is commanded. Span values are changed in the same
way that engineering units values are changed. Valid span values are 0 to 20,000.
S:1 CH1 SPAN L
04000
< > chg entr
The high span value for the channel is displayed next.
S:1 CH1 SPAN H
20000
< > chg entr
If the low and high span values are configured to be equal, the channel will output the same current
for all engineering units (AQ) values. The output current will correspond to that low/high span
value. For example, if both the low span and high span values were configured as 10,000, the
output current for the channel would be 10mA regardless of the AQ value.
The high span value must be greater than or equal to the low span value. If you enter a high or low
span value that violates this condition, you will not be able to leave the span configuration screens
until valid low and high values are configured. Pressing the MENU Up key in this situation will
cause the HHM to display the following message:
Cfg Incomplete
Clear Slot ?
yes no
If you want to return to the span configuration screens, press F4 (no). If you want to clear the
entire slot configuration instead, press F3 (yes). The slot will then be displayed as empty.