Emerson 5400, 5300 Specific Modbus Host Configuration, Emerson Process Management ROC800 Series

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Rosemount 5300/5400 Series

Manual Supplement

00809-0500-4530, Rev AA October 2010

SPECIFIC MODBUS HOST CONFIGURATION

The Remote Terminal Unit needs to be configured to communicate and correctly interpret data when reading input registers from the Rosemount 5300/5400 transmitter.

Baud Rate

The specified Baud Rates below are recommendations. If other Baud Rates are used, make sure that the 5300/5400 and the RTU are configured for the same communication speed.

Floating Point Format Code

See Section “Common Modbus Host Configuration” on page 1-25.

RTU Data Type

The RTU Data Type specifies which configuration to use in the RTU in order for the RTU to correctly interpret a floating point number transmitted from the 5300/5400 transmitter with Modbus.

Input Register Base Number

Data registers in the 5300/5400 transmitter with Modbus are numbered exactly as they are transmitted in the Modbus communication. Some RTUs use different naming conventions and to configure the RTU to poll the correct registers from the 5300/5400 Modbus, an Input Register Base Number is stated for each RTU respectively. E.g. if the input register base number is 1 for the RTU, the 5300/5400 Modbus input register 1302 has to be entered in the RTU address as input register 1303.

Emerson Process Management

ROC800 Series

Figure 1-9. Wiring Diagram for

Connecting 5300/5400 Modbus to

Emerson Process Management

ROC800 Series

Table 1-19. Parameter Values (in case of Emerson Process Management ROC800 Series)

Parameter

Value

Baud Rate

9600

Floating Point Format Code

0

RTU Data Type

Conversion Code 66

Input Register Base Number

0

 

 

The Input Register Base Number needs to be added to the Input Register address of the 5300/5400 transmitter. In this case, register 1300 needs to have 1300 entered as the address.

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Contents Rosemount 5300/5400 Series with Hart to Modbus Converter Manual SupplementSafety Messages Explosions could result in death or serious injuryIntroduction WorkflowMechanical Installation Electrical Installation Field Wiring Connections Hart + Installation cases RS-485 BusStar Topology Alternative Multidrop Connection of 5300/5400 TransmittersNo. of devices Approx. update rate Slaves External Hart Devices SlavesEstablish Hart Communication Connect to the MA/MB terminalsRosemount 5300/5400 Series Connect to the Hart terminals Transmitter Configuration Modbus Communication Protocol Configuration Using RRM to change communication parametersModbus Setup Modbus RTU Parameter Configuration Example Levelmaster Communication Setup HMC A44 B4800 PO S2HMC A127 Levelmaster Parameter Configuration Example HMC M2 A2 B9600 D7 PN S1Implemented Functions of Levelmaster Protocol Modbus Ascii Communication Setup HMC M1 A246 B9600 D7 PN S1Rosemount 5300/5400 Series Alarm Handling Modbus RTU LevelmasterModbus Ascii Rosemount 5300/5400 Series Common Modbus Host Configuration Input RegistersBit information in bitfield 14. Output Variables for Floating Point Format Code Rosemount 5300/5400 Series Volume Length Measurement UnitsSpecific Modbus Host Configuration Emerson Process Management ROC800 SeriesEmerson Process Management FloBoss ABB TotalFlowThermo Electron Autopilot Bristol ControlWave MicroScadaPack Kimray Dacc 2000/3000No communication with Modbus RTU protocol Troubleshooting No communication on RS-485 bus MA, MBNo 5300/5400 communication in RRM No communication with Modbus Ascii protocolHMC Firmware Upgrade in Rosemount Radar Master Select Enable Modbus Communication and click OKRosemount 5300/5400 Series Click Browse Checksum Rosemount 5300/5400 Series Specifications Rosemount 5300/5400 Series Emerson Process Management Rosemount Measurement