ABB | AO895 3BSC690087R1 | Analog Output Module

Product Description:

A HART instrument can be connected on any of the channels of an AI815, AO815, AI845, AO845, AI880, AI895 or AO895, module. If the instrument is connected at run-time to an AI895 or AO895, for example when the module is operational, then the module will not discover the new HART instrument automatically.

The scanning function is implemented to monitor the presence of field instruments. When the scanning is enabled all instruments of the instruments list are scanned with HART command 1. A different channel every 5s. If an instrument does not reply the DISAPPEARED and SEARCHING bits related to that instrument are set, else the SCAN_ENABLED will be set. For the instrument that is not replying the module begins to scan that instrument with HART command 0. If there is a reply to command 0, the module verifies if it comes from the original instrument: – If it does, the APPEARED bit is set, the DISAPPEARED and SEARCHING bits are cleared and the module restarts the normal scanning activity. – If it does not, the MISMATCHED bit is set, the DISAPPEARED bit is cleared and the module keeps on searching the instrument with command 0. 

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