Installation Instructions

Micropilot FMR20 Modbus RS485
8 Endress+Hauser
Signal on alarm
Depending on the interface, failure information is displayed as follows:
• Digital communication (Modbus)
– Status signal (as per NAMUR Recommendation NE 107)
– Diagnostic code
• Operating tool via SmartBlue (app)
– Status signal (as per NAMUR Recommendation NE 107)
– Plain text display with remedial action
Linearization
The linearization function of the device allows the conversion of the measured value into any unit of
length, weight, flow or volume. When operating via Modbus, linearization tables are pre-
programmed for the calculation of the volume in vessels (see the following list).
Pre-programmed linearization curves
• Cylindrical tank
• Spherical tank
• Tank with pyramid bottom
• Tank with conical bottom
• Tank with flat bottom
Other linearization tables of up to 32 value pairs can be entered manually.
Protocol-specific data, Modbus
Modbus conformity
Modbus-compliant with restrictions.
The TIA-485 Standard is only met with the following restrictions:
Maximum bus load:
100 Ω
For installations with a bus cable > 100 m, the load should not drop below 200 Ω, or a fieldbus
repeater should be used.
Time for connection setup
< 1 s
Addressing
1 to 200
Modbus settings
The following settings can be customized via Bluetooth and Modbus.
Setting Options Default
Data bits 7,8 8
Parity Even, odd, none Even
Stop bits 1,2 1
Baud rate 1200, 2400, 4800, 9600, 19200 9600
Protocol RTU, ASCII RTU
Addressing 1 to 200 1
Measured variables via
Modbus protocol
The 8 most important process parameters are mapped as burst parameters to the first addresses in
the Modbus address range. This means that these parameters can be read out in one measurement
transmission. All parameters are available in the Float32 format.
The register address must be incremented by one (register address +1) when using the
Memograph M RSG45 or Fieldgate FXA30b Modbus master.
Modbus address Parameter name Description
5000 MODB_PV_VALUE Level linearized (PV)
5002 MODB_SV_VALUE Distance (SV)
5004 MODB_TV_VALUE Relative echo amplitude
(TV)