Rockwell Automation 1734-IA2, User Manual

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Publication 1734-UM001D-EN-P - April 2008
108 POINT I/O Module Data
•
Low Low Alarm Value Bit - When the input signal is less then the Low
Low Alarm value, this bit (Channel Status Bit 4) is set. The default value
for this alarm is as follows:
•
1734-IE2C module is 2867 counts (3.5 mA).
•
1734-IE2V module is 200 counts = 200 mV (0.2V).
•
High High Alarm Value Bit - When the input signal is more then the
High Alarm value, this bit (Channel Status Bit 5) is set. The default value
for this alarm is as follows:
•
1734-IE2C module is 16792 counts (20.5 mA).
•
1734-IE2V module is 9800 counts = 9800 mV (9.8V).
•
Under-range Status Bit - This bit (Channel Status Bit 6) is set when the
module returned data is at a minimum. 1734-IE2C module is 98 counts
(around 120
μ
A); 1734-IE2V module is -0.25 or -10.25V, depending on
range. When set, the channel status indicator blinks red.
•
Over-range Status Bit - This bit (Channel Status Bit 7) is set when the
module returned data is at a maximum. 1734-IE2C module is around 21
mA. 1734-IE2V module is +10.25V. When set, the channel status
indicator blinks red.
Latch Alarms
The latch alarms lets low- and high-alarm status information to be latched
when an alarm is set. Even if an alarm is momentarily set, the status bit stays
set until a reset latch service is issued. Default setting is Unlatched. Each
channel can be configured individually.
Alarm Disable
This function disables all channel alarms and faults so they are not reported in
the channel status field. The channel indicator stays solid green, alarms are
ignored. The default state is Alarms Enabled. Each channel can be configured
individually.
Calibration Status
This status bit is set when the channel is in Calibration mode. At Begin
Calibration, the module is put into Calibration mode. This bit is reset when
the Accept Low Calibration, or Accept High Calibration, commands are sent.
This is
not the Bad Calibration Status bit, which is set if the module is not
calibrated.