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FLEX Ex 24V dc Non-Isolated Source 4 Output Module
Publication
1797-5.6 - December 2003
Cooperative Operation of the ControlNet Ex Adapter and FLEX Ex
Output Modules
The ControlNet Ex adapter (1797-ACNR15) combined with FLEX Ex
output module provides a two-tier fault state mechanism. It is important to
consider and understand the operation of this mechanism when designing
your system.
Two sets of programmable fault states are available, one each in the adapter
and output module. This two-tier method is meant to give you a wider fault
coverage compared with normal methods.
Latch Retry Mode
Latch Retry determines channel operation under
wire-off fault conditions. These bits control the
action of two channel groups - channels 0-3 and/or
channels 4-7. When a channel fault occurs, the
channel fault alarm will be set (if enabled) and the
safe state mode will be enabled. If retry is selected,
the channel will periodically try to reestablish proper
output. If latch is selected, the fault will be latched
until a Global Reset is issued.
Range: 0 = retry, 1 = latch.
Local Fault Mode
This parameter determines how the Module Safe
State will be used for bus communication and
internal module faults. This parameter sets this
characteristic for the module.
Range: 0 = fault states activated by bus
communication faults, 1 = fault states activated by
any failure (bus communications, etc.).