Rockwell Automation 1771-PD PID MODULE (+DU) - Manual (Page 72)

Programming
Chapter 3
3Ć29
W01 B14 = 1. The values of features not used must be zero. Section 3.6
describes expanded features such as cascade, decouple and feedforward.
W30(W50) Expanded Control Word (XF) This word together with
loop control word A, W18(W38), and loop control word B, W19(W39),
select the configuration for the loop. The expanded loop features are
active when selected by W01 B14 = 1. Bits 17 through 00 of the
expanded control word are defined below and summarized in Figure 3.8
for loop 1 word W30 and loop 2 word W50.
W30(W50)B17 Process Variable Scaling. (XF) Reset to 0 inhibits
process variable scaling. Set to 1 enables the scaling limits SMIN
and SMAX in words W32(W51) and W32(W52) respectively to
determine the scaled value of the process variable. The scaled or
unscaled process variable will be read by the PC processor in word
W65(W72). Refer to section titled Scaling for additional information
about scaling.
W30(W50)B16 Set Point Scaling. (XF) Rest to 0 inhibits set point
scaling. Set to 1 the module interprets this word as a scaled value
based on the scaling limits SMIN and SMAX IN WORD W32(W51)
and W32(W52), respectively. Refer to section titled Scaling for
additional information about scaling.