Rockwell Automation 1771-PD PID MODULE (+DU) - Manual (Page 68)

Programming
Chapter 3
3Ć25
Table 3.E
Multiplier Codes
W19(W39)
B15 B14 B13 Soft Fault Operating Mode
0 0 0 Analog output is set to the minimum value (+4mA
or +1VDC).
0 0 1 Analog output holds the last value prior to the
fault.
0 1 0 The PID module performs closed loop control
unless W01 B01 = 1 for loop 1 (W01 B02= 1 for
loop 2). If this bit is set prior to the soft fault, the
SET OUT value in W05(W12) remains as the loop
output.
1 0 0 The PID module performs closed loop control
regardless of the status of W01 B01 (B02). If the
loop output was the SET OUT value in W05(W12)
when the soft fault occurred, the module reverts to
PID control. This mode should be selected for
interactive PC control.
1 1 1 Analog output is set to the maximum value
(+20mA or +5VDC)
Each loop must be set independently. No other codes are permitted.
W19 (W39) B12 Input Filter Time constant Multiplier. Reset to 0
the multiplier for the input filter time constant TA stored in word
W20 (W40) is x1 (no multiplier). Set to 1 the multiplier is x10.
W19 (W39) B11 Lead Time Constant Multiplier. (XF) Reset to 0
the multiplier for the lead time constant TV stored in word W35
(W55) is x1. Set to 1 the multiplier is x 10.
W19 (W39) B10 Lag Time Constant Multiplier. (XF) Reset to 0
the multiplier for the lag time constant TC in word W 36 (W56) is
x1. Set to 1 the multiplier is x10.
W19 (W39) B07 Scaled Set Point Sign. (XF) Reset to 0 the set
point value in word W06 (W13) is positive. Set to 1 the value is
negative. This bit has meaning only when set point scaling has been
selected by 16 = 1 in word W30 (W50).
W 19 (W39) B06 Scaling Word Multiplier. (XF) This bit selects
the multiplier for the following words: