Detcon 700 Foundation Fieldbus Bridge - Manual (Page 9)

Foundation Fieldbus Bridge
700 Sensor FF Bridge IM Rev. 0.0 Page 5 of 8
3.2 Primary Variables
The transducer block (TB) in the Foundation Fieldbus Bridge includes four primary variables that indicate the
status of the sensor. These variables are described in the table in Figure 4.
Name Description Units Meaning
PV_1 Gas Concentration %LEL, ppm, or ppb 1
Concentration level measured by the
Model 700 sensor
1 Global Fault
2 Auto Span Fault
4 Temperature Fault
8 4-20mA Fault
16 Input Voltage Fault
32 Memory Fault
64 Processor Fault
128 Clearing Fault
256 Stability Fault
512 Range Fault
1024 Sensor Fault
2048 Zero Fault
4096 Sensor Fault 2
8192 Reserved
16384 In Calibration
PV_2 Fault Status 2,3 Unitless
32576 Reserved
PV_3 Input Voltage Volts (DC)
Voltage level of the power input to
the sensor
PV_4 Temperature ºC
Temperature measured by the Model
700 sensor
Figure 4
Foundation Fieldbus Bridge Primary Variables
1
Units depend on type of Model 700 attached to the Foundation Fieldbus Bridge
2
See appropriate Model 700 instruction manual for a description of each fault
3
If more that one fault is present, values are added together (e.g. if a global fault and zero fault are both present, the PV would be equal
to ‘2049’)