Burkert Type 8611 - Manual (Page 88)

88
FunctionsoftheConfigurationLevel
display description
2_P Selection for the binary output with the function as 2-state controller.
REL The 2-state control is implemented relatively to the set-point value depending on the
deviation between set-point value and actual process value.
If the set-point value is changed, the control limits are adapted automatically.
See “Figure 66: B_O1, 2_P; 2-state control relatively to the set-point value”
HYHI: Upper hysteresis
HYLO: Lower hysteresis
Value range:
HYHI, HYLO >= 0
Measuring unit: absolute, like defined in UNIT
SP The switching of the outputs is done relatively to the set-point value ( SETP) between
the limit values ( SPHI) and (SPLO). This function can be used e. g. for opening
or closing an additional open/closed valve for extending the working range of the
control valve.
SPLO: Lower switching threshold referred to set-point value
SPHI: Upper switching threshold referred to set-point value
Measuring unit: absolute, like defined in
UNIT
ABS 2-state control between the fixed limit values ( PVHI) and (PVLO). Depending on the
selected control variable and measuring unit following can be selected:
FLOW: 2-state control of flow
PRES: 2-state control of pressure
TEMP: 2-state control of temperature
LEVL 2-state control of level
VAL: 2-state control of conductivity, pH-value, concentration or process values
without indication of units (UNIT = NU)
PVHI: Upper switching threshold referred to analog process value.
PVLO: Lower switching threshold referred to analog process value.
( PVHI >= PVLO)
The 2-state control between the limit values PVHI and PVLO can, for example, be
used for the filling level control in a tank.
DLY Time in sec for that the deviation must constantly be present.
INV Effective direction between the process value and the opening of the valve
YES: Inverted control direction
NO: Direct control direction (not inverted)
Example: The control is inverted, if the displayed process value decreases when the
valve opens.
HIGH Binary output active at voltage of 24 V.
LOW Binary output active at voltage of 0 V.
Table 33: Display B_O1, configuration as 2-state controller
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Type 8611