GE VersaMax PLC User Manual page 279

Words
13 Bit 4: Antireset windup action. When this bit is 0, the
(Address + 12) antireset-windup action uses a reset (integral term)
back-calculation. When the output is clamped, the
accumulated integral term is replaced with whatever value is
necessary to produce the clamped output exactly. When the
bit is 1, the accumulated term is replaced with the value of the
integral term at the start of the calculation. In this way, the
preclamp integral value is retained as long as the output is
clamped. This option is not recommended for new
applications. Refer to chapter 14, the section,
and Rate
Bit 5: Enable derivative filtering. When this bit is set to 0, no
filtering is applied to the derivative term. When set to 1, a first
order filter is applied. This will limit the effects of higher
frequency process disturbances, such as measurement
noise, on the derivative term.
Setting Config Word: Set Config Word to 0 for default
operation. Add 1 (16#0001) to set bit 0, add 2 (16#0002) to
set bit 1, add 4 (16#0004) to set bit 2, add 8 (16#0008) to set
bit 3, add 16 (16#0010) to set bit 4, and add 32 (16#0020) to
set bit 5. For example, to set bits 0, 3 and 5 only, set Config
Word to 1 + 8 + 32 = 41 (16#0029). Some users will find the
Config Word value easier to interpret in hexadecimal (16#)
format.
14 Manual Command
(Address + 13) Set to the current CV output while the PID block is in
Automatic mode. When the block is switched to Manual
mode, this value is used to set the CV output and the internal
value of the integral term within the Upper and Lower Clamp
and Slew Time limits.
PID Built-in Function Block
For public disclosure
Parameter/Description
Limits.
Low Bit
Units
Low 6 bits
used
CV Amplitude
CV Counts
GFK-1503E User Manual 279
Range
Boolean
Tracks CV in Auto or
sets CV in Manual