Rockwell Automation 1771-PD PID MODULE (+DU) - Manual (Page 58)

Programming
Chapter 3
3Ć15
W08 Bias 1, BIAS1. When using only standard loop features, the loop
bias is the value stored in this word. When expanded loop features are
selected by W01 B14 = 1, either the feedforward term FFV or the value
stored in this word can be used as the loop bias. The feedforward term is
normally used unless W30 B02 = 1 which sets the bias to the value stored
in this word.
The data format is 4-digit BCD, range 0000 to 9999. When expanded
loop features are selected, the negative bias bit W30 B01 = 1 allows a
full-scale range of +9999.
W09 Set Process Variable 1, SET PV1. The value stored in this word is
used by the PID module as the process variable for loop 1 when W18 B15
=1. Normally, the PID module uses the hardware analog input value
when W18 B15 = 0. Data format is 4-digit BCD or 12-bit binary. Format
is selected by W01 B12. Range is 0000 to 4095.
W10 Set Feedforward Input 1, SET FFI1. (XF) The value stored in
this word is used by the PID module as the feedforward input when W30
B13 = 0. The PID module uses the tieback input 1 value as the
feedforward input when W30 B13 = 1. This word can be used only when
expanded loop features are selected by W01 B14 = 1. Data format is
4-digit BCD or 12-bit binary. Format is selected by W01 B12. The range
is 0000 to 4095.
NOTE: The following words are programmed if the module is
configured for 2-loop operation, W01 B15 = 0.
W11 Loop 2 Block Start Address. This word contains the data table
address of the first word in the file associated with the loop 2 block. The
address is required by the PID module to prompt the transfer of the loop 2
constants.
W12 Set Analog Output 2, SET OUT2. The value stored in this word
becomes the analog output when W01 B02 = 1. Normally, the PID
module outputs the PID algorithm value when W01 B02 = 0. Data format
is 4-digit BCD or 12-bit binary. Format is selected by W01 B12. Range
is 0000 to 4095.
W13 Set Point 2, SP2. This word contains the set point value for loop 2.
Data format is 4-digit BCD or 12-bit binary as selected by W01 B11. The
unscaled range is 0000 to 4095.