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The following table shows all the device-specific parameters of the Sensor Transducer Blocks:
Transducer Block “Sensor 1 and 2”
Parameter
Write access
with operating
mode
(MODE_BLK)
Description
Primary value
(PRIMARY_
VALUE)
AUTO - OOS
Result of link PRIMARY_VALUE_TYPE:
VALUE
STATUS
Note: The PRIMARY_VALUE can be made available
to the AI Block for further processing. The
assigned unit is the PRIMARY_VALUE_UNIT.
Primary value unit
(PRIMARY_
VALUE_UNIT)
AUTO - OOS
Configuring the unit of the PRIMARY_VALUE
Note: The measurement range and engineering units
are configured with an existing link in the
relevant Analog Input function block using
the XD_SCALE parameter group. A detailed
description of the Ana.log Input (AI) function
block can be found in the Foundation
Fieldbus™ Function Blocks manual.
Primary value type
(PRIMARY_
VALUE_TYPE)
AUTO - OOS
The calculation process for the PRIMARY_VALUE
appears on the display.
Display:
Sensor Transducer 1:
PV = SV_1: Secondary Value 1
PV = SV_1-SV_2: Difference
PV = 0.5 x (SV_1+SV_2): Average
PV = 0.5 x (SV_1+SV_2) redundancy: Average
or Secondary Value 1 or Secondary Value 2 in the
event of a sensor error in the other sensor.
PV = SV_1 (OR SV_2): Backup function: If sensor
1 fails, the value of sensor 2 automatically becomes
the Primary Value.
PV = SV_1 (OR SV_2 if SV_1>T): PV
changes from SV_1 to SV_2 if SV_1 > value T
(THRESHOLD_VALUE parameter)
Sensor Transducer 2:
PV = SV_2: Secondary Value 2
PV = SV_2-SV_1: Difference
PV = 0.5 x (SV_2+SV_1): Average
PV = 0.5 x (SV_2+SV_1) redundancy: Average
or Secondary Value 1 or Secondary Value 2 in the
event of a sensor error in the other sensor.
PV = SV_2 (OR SV_1): Backup function: If sensor
2 fails, the value of sensor 1 automatically becomes
the Primary Value.
PV = SV_2 (OR SV_1 if SV_2>T): PV
changes from SV_2 to SV_1 if SV_2 > value T
(THRESHOLD_VALUE parameter)
Threshold value
(THRESHOLD_
VALUE)
AUTO - OOS
Value for switching in the threshold PV mode.
Entry in the range from -270°C to 2450°C (-454°F to
+4442°F)