Controlling Each Output Channel's Signal - Spectrum Controls SLC 500 User Manual

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