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Publication 1747-SG001D-EN-P — January 2009
Backup Scanner Module
The 1747-BSN module contains the full complement of RIO scanner features, plus
backup capability for support of redundant processor applications. The backup
system consists of one or more pairs of complementary modules, with one module
residing in the primary system and the other in the backup system. The primary
system controls the operation of remote I/O, while the backup system monitors
communications via the high-speed serial link (HSSL) and is available to take control
in the event of a fault in the primary system.
The 1747-BSN features:
backup of one Remote I/O or DH+ network per complementary BSN module pair.
backup of one RS-232/DH-485 communications per complentary BSN module pair,
allowing HMIs on channel 0 to automatically transfer to the primary processor.
transfer of up to 2 K words of retentive data per BSN.
repair of primary system fault during secondary backup system operation.
remote programming capability of secondary processor on DH+ (SLC 5/04 only).
minimal user program impact.
backup system diagnostic information.
High Speed Serial Link
1747-BSN
Module
1747-BSN
Module
RIO
Network
RIO Network
1747-ASB Module
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