Allen-Bradley 1734-OB2, User Manual, Page: 105 / 221

Rockwell Automation Publication 1734-UM001E-EN-P - July 2013
POINT I/O Module Data 107
•
60 Hz - 100 ms update rate
•
250 Hz - 24 ms update rate
•
500 Hz - 12 ms update rate
The update rate determines the rate at which the inputs are sampled. Maximum
update rate is determined by the notch filter setting. The notch filter parameter is
used to select the fastest possible rate. Minimum update rate is 10,000 ms.
Alarms
Available alarms include the following:
• Low
• Low Low
• High
• High High
Each alarm has one status bit which is set to indicate when the input goes beyond
its set point. All Alarm Status bits can be read individually or from the Channel
Status Byte (bits 2…5).
You can configure each channel alarm individually.
Range Status
The module reports both Under Range and Over Range status.
•
Under Range Status - This bit (Channel Status Bit 6) is set when the
module returned data is at a minimum.
– For the 1734-IE2C module, the value is 98 counts
(around 120
μ
A).
–
For the 1734-IE2V module, the value is -0.25 or -10.25V, depending on
mode.
– When set, the channel status indicator blinks red.
– On the 1734-IE2C module, a wire-off condition sets this bit.
• Over Range Status - This bit (Channel Status Bit 7) is set when the
module returned data is at a maximum.
–
For the 1734-IE2C module, the value is around 21 mA
–
For the 1734-IE2V module, the value is +10.25V.
–
When set, the channel status indicator blinks red.
–
On the 1734-IE2V module, a wire-off condition sets this bit.