Allen-Bradley 1734-OB2, User Manual, Page: 111 / 221

Rockwell Automation Publication 1734-UM001E-EN-P - July 2013
POINT I/O Module Data 113
clamped. The clamps are absolute. Regardless of what is sent to the module or
what the fault state values are, the module does not operate outside these settings.
Latch Alarms
The latched alarms let low and high clamp status information to be latched. If an
output is clamped momentarily, the clamp status bit stays set until a reset latch
service is issued. The default setting is Unlatched. Each channel can be
configured individually. You can enable the Latch on a per-channel basis.
Alarm Disable
This function disables all channel alarms and faults so they are not reported in
the channel status field. The channel LED status indicator stays solid green, and
Latch Alarms are ignored. Change-of-state has no effect on module behavior.
Default state is Alarms Enabled. Each channel can be configured individually.
You can disable Alarms on a per-channel basis or they can be set with the Module
Configuration Assembly.
Channel Indicators
See the table for channel indicator states for given module condition.
Indication 1734-OE2C Probable Cause 1734-OE2V Probable Cause
Channel Status
Off Module in CAL mode Module in CAL mode
Solid green Channel actively controlling
outputs Channel actively controlling
outputs
Blinking green Channel calibrating Channel calibrating
Blinking red Open wire or no power Low/High Clamp alarm
Solid red Unrecoverable fault - may require
device replacement Loss of field power