Publication 1766-RM001A-EN-P - October 2008
340 Process Control Instruction
Controller Gain (K
c
)
Gain K
c
(word 3) is the proportional gain, ranging from 0…3276.7 (when
RG = 0), or 0…327.67 (when RG = 1). Set this gain to one-half the value
needed to cause the output to oscillate when the reset and rate terms
(below) are set to zero.
Reset Term (T
i
)
Reset T
i
(word 4) is the Integral gain, ranging from 0…3276.7 (when RG =
0), or 327.67 (when RG = 1) minutes per repeat. Set the reset time equal
to the natural period measured in the above gain calibration. A value of 1
adds the maximum integral term into the PID equation.
Tuning Parameter
Descriptions
Address Data Format Range Type User Program
Access
KC - Controller Gain - K
c
PD10:0.KC word (INT) 0…32,767 control read/write
TIP
Controller gain is affected by the reset and gain range (RG) bit. For
information, see PLC 5 Gain Range (RG) on page 345.
Tuning Parameter
Descriptions
Address Data
Format
Range Type User Program
Access
TI - Reset Term - T
i
PD10:0.Ti word
(INT)
0…32,767 control read/write
TIP
Reset term is affected by the reset and gain range (RG) bit. For information,
see PLC 5 Gain Range (RG) on page 345.
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