S
= high limit of signal value
high
∆S = S
- S
high
low
D = data value (user-defined scale)
U
= low value of user-defined scale
low
U
= high value of user-defined scale
high
∆U = U
- U
high
low
Example – Suppose you have a valve with a 4–20 mA range, and you want your
scale to go from 100 to 9999 counts. For a 4–20 mA output with user-defined
scaling, your module sets the signal limits to 3.5 mA and 20.5 mA. After entering
100 and 9999 into output words 6 and 7, respectively, the relationship between
data value (counts) and output signal would be as follows
Figure 3-3. Example Relationship Between Output Signal and Channel Data
In the preceding example:
S
= 3.5
U
= 100
low
low
S
= 20.5
U
= 9999
high
high
∆S = 17
∆U = 9899
Controlling Each Output Channel's Signal
Output words 0 through 3 determine the output signal levels for channels 0
through 3, respectively. The output signal level depends on the output range and
data format selected:
Chapter 3: Configuring the 1746sc-INO4I
User's Manual Pub. 0300266-04 Rev. A
3-11
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