Rockwell Automation 1794-ASB/E Remote I/O Adapter Module User Manual - Manual (Page 27)

2–9 Installing Your Remote I/O Adapter Module
Publication 1794ĆUM009D-EN-P - April 2004
Rack Fault Select Switch (RFS)
The rack fault select allows the user to determine what action the
adapter takes if communication is lost with one or more I/O modules
ATTENTION
!
If an I/O module stops responding to the adapter
due to a module being removed under power, a
problem with the flexbus, or a problem with an
I/O module, the adapter declares a Local fault.
When RFS is disabled (S2–6 on), module removal and insertion
under power (RIUP) is possible. If an I/O module stops responding,
the adapter declares a local fault and flashes the Local Fault
indicator. The adapter also resets the output data (if any) for the
module not responding. All other modules remain active.
When the RFS is enabled (S2-6 off), communication error
detection is extended to the I/O module level. If an I/O module stops
responding, the adapter declares a local fault, flashes the Local Fault
indicator and causes the scanner to declare a Rack Fault. The adapter
resets the output data (if any) for the module not responding and
commands all other outputs to go to the state determined by the Hold
Last State switch (S2–1).
ATTENTION
!
Module removal and insertion under power
(RIUP) will cause a rack fault when Rack Fault
Select is enabled.
Addressing Mode Selection Switches
The addressing mode switches are used to select the addressing
modes of the adapter: standard, 8-pt compact, 16-pt compact, 8-pt
complementary, 16-pt complementary, 32 standard, and 32
complimentary. Refer to the table on page2–12 for information on
the interaction of these switches.
Mode switch S1-1 provides different functions. In standard mode, it
acts as part of the rack address, providing backward compatibility
with the series A or B adapters. In compact mode, it determines 8 or
16-point density. In complementary mode, it specifies whether the
rack has a complementary rack at the same address.