Embedded HART Multiplexer
Both the BMEAHI0812 input module and the BMEAHO0412 output module include an embedded HART multiplexer. The multiplexer facilitates the transmission of HART field instrument data by providing:
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one-to-many HART communication between a single HART master and multiple HART field devices, and
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HART instrument data to a PLC master, as part of the periodic scan
HART Primary and Secondary Masters
A HART master can be either:
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a primary master, such as a:
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configuration PC running Control Expert, or asset management software
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PC running SCADA as HART server
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a secondary master, such as a hand-held device that can be temporarily connected directly to the current loop between an I/O module and the HART field instrument
1
Local rack containing a BME P58 3040 CPU with remote I/O scanning service
2
Remote I/O rack containing a BME CRA 312 10 adapter module
3
Remote I/O main ring
4
HART-enabled field instruments connected to I/O via 4-20 mA current loop wiring
5
Maintenance PC operating as HART primary master (running, for example, Control Expert configuration software or asset management software) or SCADA
6
Hand-held HART secondary master
The HART multiplexer supports one HART field instrument per I/O channel.
