Rockwell Automation 1771-PD PID MODULE (+DU) - Manual (Page 56)

Programming
Chapter 3
3Ć13
by (LE). These bits are protected from accidental change because
they control the number of PID loops, standard or expanded loop
features and binary or BCD data format. These bits can be changed
in the same manner that loop constants are changed, only by a
load/enter sequence. The remaining bits in the master control word
and the remaining dynamic block words can be changed at any time
by a write block transfer. See sections titled Power-Up Load/Enter
Sequence and Load/Enter Sequences.
W01 B05, B04 Verify. Both bits must be set to 0 for normal
operation.
W01 B03 Enter. Used with load bit W01 B06 to complete a
load/enter sequence. when 0, the data previously loaded remains in
the module’s buffer. Set to 1 the buffered data is moved from the
buffer into the module’s active area and the sequence is completed.
The buffered data includes all loop constants and the four (LE) bits
in the master control word W01 B15, B14, B12, B11. See sections
titled Power-Up Load/Enter Sequence and Load/Enter Sequence.
W01 B02 Set Output 2. Reset to 0 selects the analog output value
determined by the module’s PID algorithm. Set to 1 selects the
analog output as the value stored in word W12, Set OUT2,
downloaded from the PC processor. When reset to 0, the analog
output value is adjusted automatically from the SET Out value to the
value determined by the PID algorithm, a bumpless transfer.
W01 B01 Set Output 1. Reset to 0 selects the analog output value
as determined by the module’s PID algorithm. Set to 1 selects the
analog output as the value stored in word W05, SET OUT1,
downloaded from the PC processor. When reset to 0, the analog
output value is adjusted automatically from the SET OUT value to
the value determined by the PID algorithm, a bumpless transfer.
W01 B00 Set Manual Request. Reset to 0 the PID module inhibits
contact closure. Set to 1 generates a contact closure for 50msec. To
repeat this one-shot closure, it is necessary to first reset this bit to 0
and then set it to 1 again.
W02 Control Word. Use this word to select ISA or A-B values for the
PID algorithm, or to select module calibration.
W02 B17, B16 Calibration. Refer to chapter 5.