Rockwell Automation Publication 1715-UM001J-EN-P - December 2020
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Chapter 7 1715 Redundant I/O System in SIL 2 Safety Applications
Shutdown Modes
When the module is in Shutdown mode, the Ready and Run indicators turn
red. During module configuration, you choose how you want the output
channels to behave in the Shutdown mode, whether due to fault or Program
mode. Output module channels can be configured to provide the following
channel values:
•
De-energized (OFF), which is the default fail-safe value
•
Hold Last State
Analog Output Modules
The analog output module can be used in applications where the output
current is in the range 4…20 mA during normal operation including trip/action
value and where 0 mA is the fail-safe value. In these applications, one 1715-
OF8I output module is sufficient for SIL 2 requirements, two modules provide
a 1oo2 level.
The analog output module is rated at SIL 2 as a fail-safe simplex module and
when used in a 1oo2 configuration as a duplex module with these features:
•
Commanded values and scaling factor