Spectrum Controls 1746sc-INI4vi - Manual (Page 37)

Chapter 4: Using Your Input Module 33
Setting The User-
Defined Scale Limits
(optional)
For special applications (such as when using a sensor with a non-standard
operating range), the 1746sc-INI4i and 1746sc-INI4vi input modules let
you define up to two custom data formats. These “user-defined scales”
are very similar to the “proportional counts” data format provided by
your module and many Allen-Bradley modules—except that instead of
scaling the input signal to a previously defined range (-32,768 to
+32,767), your module can scale the input signal to a range defined by
the values in output words 4 and 5 (for user-defined scale A) or output
words 6 and 7 (for user-defined scale B).
Low Value of User-Defined Scale A
15 0
O:e.4
Address
High Value of User-Defined Scale A O:e.5
Low Value of User-Defined Scale B O:e.6
High Value of User-Defined Scale B O:e.7
Important - After setting user-defined scale limits, you must toggle the
channel enable bit (configuration bit 0) in order for your module to use
the new limits.
Output word 4 (or 6) defines the low limit of the user-defined scale
(down to -32768), while output word 5 (or 7) defines the high limit of the
user-defined scale (up to +32767). The high limit value must be greater
than the low limit value for proper operation.
You select the data format for each channel using that channel’s
configuration word, described in the previous subsection, Configuring
Each Input Channel.