Rockwell Automation 1747-BSN Backup Scanner Module - Manual (Page 49)

Publication 1747-UM010B-EN-P - September 2003
Installation and Wiring 3-7
Local Status Link and High-Speed Serial Link Wiring
The High-Speed Serial Link connects complementary 1747-BSN
modules. The HSSL allows network commands to be transferred
between BSN modules using DH+. Retentive data can be transferred
between the primary and secondary processors via the HSSL via
ladder logic supporting handshake data transfer. The complementary
BSN modules are connected using Belden™ 9463 cable.
The Local Status Link exchanges status information between 1747-BSN
modules in the same chassis without programming. The BSN modules
are connected using Belden 9463 cable.
Figure 3.1 HSSL and LSL Connections
RIO Network and RIO Link Wiring
In primary mode, the 1747-BSN module can act as a RIO scanner,
supporting discrete I/O control, RIO block transfers, and RIO
passthru. In secondary mode, the BSN module monitors the primary
BSN. If the primary BSN module fails, the secondary module becomes
primary.
The scanner is connected to other devices using the RIO link. There
are no restrictions governing the space between each device,
provided the maximum cable distance is not exceeded.
A 1/2 Watt terminating resistor (included with the module) must be
attached across line 1 and line 2 of the connectors at each end
(scanner and last physical device) of the RIO link. The value of the
Processor
Processor
1747-BSN 1747-BSN
LSL LSL
HSSL
HSSL (Line 1 - Blue)
HSSL (Shield)
HSSL (Line 2 - Clear)
LSL (Line 1 - Blue)
LSL (Shield)
LSL (Line 2 - Clear)
Terminal Block Wiring
HSSL