Endress+Hauser Levelflex FMP56 Operating Instructions Manual page 172

Operating menu
Current span
Navigation
Description
Selection
Factory setting
Additional information
Fixed current
Navigation
Prerequisite
Description
User entry
Factory setting
172
 Setup → Advanced setup → Current output 1 to 2 → Current span
Determines the current range used to transmit the measured value. '4...20mA': Measured
variable: 4 ...20 mA '4...20mA NAMUR': Measured variable: 3.8 ... 20.5 mA '4...20mA US':
Measured variable: 3.9 ... 20.8 mA 'Fixed current': Measured variable transmitted via
HART only Note: Currents below 3.6 mA or above 21.95 mA can be used to signal an
alarm.
• 4...20 mA
• 4...20 mA NAMUR
• 4...20 mA US
• Fixed current
4...20 mA NAMUR
Meaning of the options
Option Current range for process
variable
4...20 mA 4 to 20.5 mA
4...20 mA NAMUR 3.8 to 20.5 mA
4...20 mA US 3.9 to 20.8 mA
Fixed current
• In the case of an error, the output current assumes the value defined in the Failure
mode parameter (→  173).
• If the meausred value is out of the measuring range, diagnostic message Current
output is issued.
In a HART multidrop loop only one device can use the analog current to transmit a
signal. For all other devices one must set:
• Current span = Fixed current
• Fixed current (→  172) = 4 mA
 Setup → Advanced setup → Current output 1 to 2 → Fixed current
Current span (→  172) = Fixed current
Define constant value of the output current.
4 to 22.5 mA
4 mA
Lower alarm signal level Upper alarm signal level
< 3.6 mA
< 3.6 mA
< 3.6 mA
Constant current, defined in the Fixed current parameter (→  172).
Levelflex FMP56, FMP57 HART
> 21.95 mA
> 21.95 mA
> 21.95 mA
Endress+Hauser

