ABB 800xA Operation page 240

PID Controller FCM
LOCAL RATIO Field
This field specifies the local remote setpoint ratio value for the controller. The
configured entry is the initial local ratio. During runtime, you can change the local
ratio value at the console. Valid entry is a value in engineering units.
LIMITED RATIO MODES Field
This field specifies the ratio modes to which the ratio limits are applied. Valid
entries are:
RATIO HIGH LIMIT Field
This field specifies the high limit for the ratio values. This limit only applies to the
ratio modes specified in the LIMITED RATIO MODES field. Valid entry is a value
in engineering units.
RATIO LOW LIMIT Field
This field specifies the low limit for the ratio values. This limit only applies to the
ratio modes specified in the LIMITED RATIO MODES field. Valid entry is a value
in engineering units.
INC MINIMUM OUTPUT Field
This field specifies the critical value for the incremental PID algorithm. The critical
value is the smallest result of the algorithm that affects the output device. For
instance, when pulse duration outputs drive the output device, the critical value is
the smallest result of the PID algorithm that turns on a pulse duration output. When
the result is less than the critical value, the value is stored and the result has no
effect. On the next scan, the stored value is used to calculate a new result. Unused
results are stored until the cumulative result is large enough to use.
240
NONE
LOC limits apply to the local ratio
REM limits apply to the remote ratio
LOC/REM limits apply to both modes
Appendix A Runtime Templates
3BUR002418-600 A