Rosemount 3051S Electronic Remote Sensors - Emerson Process ...

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Rosemount 3051S ERS System ADDITIONAL CONFIGURATION 3-6 Reference Manual 00809-0100-4804, Rev AA January 2011 The following items are considered optional and may be configured as needed. Refer to Appendix B: for the full Field Communicator menu tree. Local Display A local display is available as an orderable option on the ERS Primary Fast Keys 2, 1, 3 Table 3-3. Available Parameters for Local Display Transmitter. The display will show a 0-100% scaled bar graph, the selected measurements from Table 3-3, and any diagnostic or error messages. At least one parameter from Table 3-3 must be selected. If more than one item is selected, the display will scroll through the selected parameters, showing each for three seconds. Burst Mode When configured for burst mode, ERS provides faster digital communication Fast Keys 2, 2, 5, 3 Table 3-4. Burst Command Options Available Parameters for Local Display Differential Pressure PHI Module Temperature Output (% of Range) PHI Pressure PLO Module Temperature PLO Pressure Scaled Variable from the ERS assembly to the control system by eliminating the time required for the control system to request information from the ERS assembly. When in burst mode, the ERS system will continue to output a 4-20 mA analog signal. Because the HART protocol features simultaneous digital and analog data transmission, the analog value can drive other equipment in the loop while the control system is receiving the digital information. Burst mode applies only to the transmission of dynamic data (process variables in engineering units, primary variable in percent of span, and the analog output reading), and does not affect the way other transmitter data is accessed. Access to information that is not burst can be obtained through the normal poll/response method of HART communication. A Field Communicator, AMS, or the control system may request any of the information that is normally available while the ERS system is in burst mode. Burst Mode Configuration To have the ERS system configured to communicate in burst mode: • Set the Burst Mode parameter to “on.” • Select a Burst Option from Table 3-4 below. This parameter determines what information is communicated through burst mode. HART Command Burst Option Description 1 PV Primary Variable 2 % range/current Percent of range and mA output 3 Dyn vars/current All process variables and mA output 9 Devices vars w/ status Burst variables and status information 33 Device variables Burst variables NOTE: If using an ERS system with the Rosemount 333 HART Tri-Loop, the burst option should be set to “Dyn vars/current.”
Reference Manual 00809-0100-4804, Rev AA January 2011 Multidrop Communication Fast Keys 2, 2, 5, 2 Figure 3-2. Typical Multidrop Network HART Modem Rosemount 3051S ERS System Burst Variable Slot Definition If either “Device vars w/ status” or “Device Variables” is selected as the Burst Option, you will need to configure which variables are communicated in Burst Mode. This is accomplished by assigning a variable to a Burst Slot. ERS has four available Burst Slots for burst communication. The HART protocol allows several transmitters to communicate digitally on a single transmission line when wired in a Multidrop network. If using an ERS system in a multi-drop network, the connection to the network is made through the Primary Sensor as shown in Figure 3-2. NOTE: Figure 3-2 shows a typical multidrop network. This figure is not intended as an installation diagram. Communication between the host and the transmitters takes place digitally, and the analog output on each transmitter is deactivated. NOTE: A transmitter in multidrop mode with “Loop Current Mode” disabled has the analog output fixed at 4 mA. Power Supply ERS System 3-7
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