Flow-X─ Function Reference
4-265
Flow-X General functions - fxPID
Function
outputs
Remark
EU
SW tag
Alarm
Fallback
Control output
The actual output value as percentage of
scale that shall be used for actual control.
Equals the required control output
including the slew rate and min/max
limitations.
%
Setpoint value
The actual setpoint in-use (may differ
from the required setpoint because of the
SP clamp rate)
EU
Tracking mode
0: Disabled
<> 0: Enabled
This output is meant for cascade control.
If this function acts as the secondary
(Slave) PID controller in a cascade
configuration, this input needs to be
connected to output 'Tracking mode' of
the primary (Master) PID function
This output tells the primary (Master) PID
function that the Slave PID function is not
using the Cascade input, but the Manual
output % or Setpoint value instead. This
allows the primary PID function to track
the secondary process or setpoint value
enabling a bumpless transfer between
modes.
Tracking value
This output is meant for cascade control.
If this function acts as the secondary
(Slave) PID controller in a cascade
configuration, this input needs to be
connected to output 'Tracking value' of
the primary (Master) PID function
The value depends on the Manual and
Cascade mode:
If Manual mode is enabled, this output
equals the percentage of scale of input
'Process value', else this output equals the
percentage of scale of input 'Setpoint
value'.
%
Error
Current error
P
Current proportional part
I
Current integral part
D
Current derivative part
v
Required control output as percentage of
scale (refer to section calculations). This
output is for information only and shall
not be used for actual control
%
Summary of Contents for flow-x
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