Rockwell Automation 1747-BSN Backup Scanner Module - Manual (Page 53)

1 Publication 1747-UM010B-EN-P - September 2003
Chapter
4
Operating Your SLC 500 Backup System
Chapter Objectives In this chapter we describe how the primary system transfers data to
the secondary system. We do this by describing the operation of the:
•
1747-BSN module
•
SLC 500 backup system
In addition, we provide procedures for:
•
starting your system
•
powering up your system
•
disconnecting a faulted system
•
restarting a repaired system
•
changing the processor’s operating mode
•
editing a program on-line
How the 1747-BSN Module
Operates In a SLC 500 backup system, the 1747-BSN module performs three
distinct functions:
•
automatic transfer of remote input data over the High-Speed
Serial Link (HSSL)
•
transfer of data in the data table by data transfer using M files
•
secondary processor remote programming capability
Automatic Transfer of Remote Input Data Over the HSSL
With automatic transfer, the primary 1747-BSN module is continually
updating a copy of the remote input image table in an interface
located in the secondary 1747-BSN module. This remote input data
includes discrete and analog data.
(1)
Automatic transfer of input image
is carried out over the High-Speed Serial Link (HSSL) and is
independent of the application program.
(1) This does not include Block Transfer analog data.