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Chapter 7
Configure Relays
208
Expansion Bus Fault
A timeout function is implemented that requires that a "Heartbeat™" from
each expansion module is provided to help verify that each module is
communicating and that the bus is functioning.
A bus fault is reported if communication between the expansion module and
its host (main module) fails - the heartbeat period times out.
Latching
Configuration of each relay of the main and expansion relay module also
includes a Latch Enable control. This control differs from the Latch Enable of
the Voted Alarm in that this Latch definition is associated only with relay
behavior that is related to the Fault detection.
page
222.
Reset of a latched relay remains the same as for the standard alarm reset
function.
Relay Drive Testing
The module routinely performs a test of the drive circuit on all expansion
module relays that are defined as fail-safe when the module compliance
requirement is set API-670 Compliant.
and
General Page on page
Figure 83 - API-670 Compliant
ATTENTION: The specific frequency of the testing for the configured
application can be read from the module. See the Dynamix™ Relay Module
Object in the Object Library documentation for further information.
Failure of a routine drive circuit test constitutes a "module fault" condition for
expansion module.
Rockwell Automation Publication 1444-UM001D-EN-P - June 2018
See Voted Alarms Page on
See Voted Alarms Page on page 222
97.
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