Description
概观
Essential details:FBM214B/216B RH924JH HART Communication Input Module
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FBM214B/216BÂ RH924JH HART Communication Input Module
The Cable Balun module is used to maintain digital communication line balance for HART Transmitter to FBM loops that are powered from a common external power supply. This powering effectively connects one line of each loop together. Without the Baluns, in each loop so powered, the common connection at the external power supply, would cause near end crosstalk at the system end of the loop wiring cable. Loops using FBM internal power source do not require Baluns.
The Cable Balun module contains multiple Baluns. One Balun segment is interconnected in each externally powered loop (see Cable Balun Module). There is one Cable Balun module for four channels.
• Supported HART Instruments: HART instruments compliant to Version 5, 6, or 7 of the HARTspecifications may be used
• Interface: 8 individually isolated channels
• Communication to the Device: Point-to-point, master/slave, asynchronous, half-duplex, at 1200 baud
• Detected Error Checking: Parity on each byte, and one CRC check byte
• Speed: 2 messages per second
• Fastest Allowed ECB Block Period: 100 msec – However, we recommend that you see the Sizing Guidelines and Excel
Workbook appropriate for your Control Processor to determine the optimal loading for a 100 msec Block Processing Cycle (BPC)
• Maximum Distance (FBM214b to Field Device): Meets HART FSK physical layer specification HCF_SPEC-54, Revision 8.1 [up to 3,030 m (10,000 ft)]