Rockwell Automation 1771-PD PID MODULE (+DU) User Manual
Page 230
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Summary Word and Bit Tables
Appendix D
DĆ9
Table D.D
Control Word A W18(W38)
Bit
Title
Status
B17
Block identifier
0 in W18
1 in W38
B16
Block identifier
0 in W38
1 in W18
B15
Source of PV
0=analog hardware input
1=PC processor, W09(W16)
B14
Square root of PV
0=reset
1=enable
B13
Error polarity
0=SP-PV direct acting
1=PV-SP reverse acting
B12
Error limit
0=rest
1=enable EMN in W21(W41) and EMP in W22(W42)
B11
Dead band
0=reset
1=enable DB in W23(W43)
B10
Maximum integral term limit
0=reset
1=enables VIMAX in W26(W46)
B07,B06
Proportional term error
00=E
01=2/3E + 1/3E@
B05,B04
Integral term error
10=1/3E + 2/3E@
11=E@
B03
Derivative term error
0=error
1=PV
B02
Maximum derivative term limit 0=reset
1=enables VDMAX in word W27(W47)
B01
Hold PID calculation
0=reset
1=hold VPID last value
B00
Hold bias
0=reset
1=hold BIAS last value