159
Input Processing
PID Function Block
Input Processing
The input signal to IN is filtered through a lag filter whose time constant is set in
PV_FTIME, and then set as the process variable (PV).
Setpoint (SP) Limiters
The path for computing the SP differs depending on the mode. In Cas mode, CAS_IN is
used for SP. In RCas mode, RCAS_IN is used for SP. If the value of CAS_IN or
RCAS_IN, whichever is used, is greater than SP_HI_LIM (high limit) or less than
SP_LO_LIM (low limit), the internal SP is set to the respective limits. When the target
mode is Auto or Man, and when SP-PV tracking is not specified at the same time, the
rate of change in the setpoint is also limited (by the values of SP_RATE_UP and
SP_RATE_DN).
PID Computation
For PID control, the block employs the PV-proportional and PV-derivative type PID
control algorithm (referred to as the I-PD control algorithm) for Auto and RCas mode.
This algorithm measures control stability against sudden changes in the setpoint, such
as when you enter a new setpoint value. At the same time, the IPD algorithm ensures
excellent controllability by performing proportional, integral, and derivative control
actions in response to changes of characteristics in the controlled process, changes in
load, and occurrences of disturbances.
For Cas mode, PV-derivative type PID control algorithm (referred to as the PI-D control
algorithm) is employed in order to obtain better performance against the changes in the
setpoint.
The algorithm is automatically changed by the block according to the mode. A basic
form of each algorithm is expressed in the equation below.
In Auto / RCas mode
Summary of Contents for FVP110
Page 14: ...FVP 110 Fieldbus Valve Positioner Manual This page intentionally left blank ...
Page 22: ...FVP 110 Fieldbus Valve Positioner Manual This page intentionally left blank ...
Page 48: ...FVP 110 Fieldbus Valve Positioner Manual This page intentionally left blank ...
Page 50: ...FVP 110 Fieldbus Valve Positioner Manual 34 GE Energy Block Diagram Figure 14 Block Diagram ...
Page 74: ...FVP 110 Fieldbus Valve Positioner Manual This page intentionally left blank ...
Page 88: ...FVP 110 Fieldbus Valve Positioner Manual This page intentionally left blank ...
Page 97: ...81 Dimensions Standard Specifications Dimensions Figure 46 Single Acting Actuator Dimensions ...
Page 99: ...83 Dimensions Standard Specifications Figure 48 Terminal Configuration ...
Page 100: ...FVP 110 Fieldbus Valve Positioner Manual This page intentionally left blank ...
Page 115: ...99 View Object Configuration Table 11 View Object for Transducer Block continued ...
Page 117: ...101 View Object Configuration Table 18 View Object for AO Function Block ...
Page 119: ...103 View Object Configuration Table 20 View Object for OS Function Block ...
Page 121: ...105 View Object Configuration Table 22 View Object for Resource Block ...
Page 124: ...FVP 110 Fieldbus Valve Positioner Manual This page intentionally left blank ...
Page 130: ...FVP 110 Fieldbus Valve Positioner Manual This page intentionally left blank ...
Page 138: ...FVP 110 Fieldbus Valve Positioner Manual This page intentionally left blank ...
Page 156: ...FVP 110 Fieldbus Valve Positioner Manual This page intentionally left blank ...
Page 168: ...FVP 110 Fieldbus Valve Positioner Manual This page intentionally left blank ...
Page 238: ...FVP 110 Fieldbus Valve Positioner Manual 222 GE Energy Table 72 LM Parameter Part List ...
Page 239: ...223 LM Parameter List Link Master Functions ...
Page 246: ...FVP 110 Fieldbus Valve Positioner Manual This page intentionally left blank ...
Page 262: ...FVP 110 Fieldbus Valve Positioner Manual 246 GE Energy Table 85 Download Error Codes ...
Page 265: ...249 Comments on System Network Software Download Table 88 DOMAIN_DESCRIPTOR ...
Page 266: ...FVP 110 Fieldbus Valve Positioner Manual 250 GE Energy Table 89 DOMAIN_HEADER ...
Page 288: ...FVP 110 Fieldbus Valve Positioner Manual This page intentionally left blank ...
Page 289: ...273 H Customer Maintenance Parts List ...
Page 290: ...FVP 110 Fieldbus Valve Positioner Manual 274 GE Energy ...
Page 291: ......