Rockwell Automation 1797-OB4D FLEX Ex 24V DC Nonisolated Source 4 Output Module - Manual (Page 18)

18 FLEX Ex I/O 24V DC 4 Non-Isolated Source Output Module
Publication 1797-5.6 - June 2011
Adapter Operation
Network Communication Monitoring
The adapter is the primary monitor of network activity. If it detects loss of
network communication, it can be programmed to:
• continue writing the last valid received data to the module (hold last
state).
• apply local module safe states. (1)
• write a programmable fault state value to the module, depending upon
the module type.
(2)
This mechanism primarily targets fault behavior for loss of network
communication.
Program Mode Behavior
The adapter also monitors the state of the controlling processor or scanner.
Two states can be detected: Run mode and Program mode (idle).
When Program mode is detected, the adapter can be configured to:
• continue writing the last valid received data to the module (hold last
state).
• apply local module safe states to zero. (1)
• write a programmable fault state value to the module, depending upon
the module type. (2)
FLEX Ex Output Module Operation
The following describes the output module operation.
(1) This selection is shown as Reset Outputs in RSNetWorx software, but its action is Apply Local Module
Safe States.
(2) This option is only available in some adapters.