Rockwell Automation 1734-IA2, User Manual

Page: 109 / 242

Publication 1734-UM001D-EN-P - April 2008
POINT I/O Module Data 107
Scaling
Select scaling for each channel by making the selection on the configuration
dialog. Scaling is the conversion of unscaled data to engineering units.
The high and low scalers (Engineering Units) are signed integers. There are no
restrictions on these units.
•
Defaults for 1734-IE2C scalers are +3277 @ 4 mA for low
and +16,383 @ 20 mA for high.
•
Defaults for 1734-IE2V scalers are 0 @ 0V for low
and +10,000 @ 100V for high.
Set each scaler individually or on a per channel basis.
The 1734-IE2C module reads a current input between 0 or 4 mA (low) and 20
mA (high) dependent on mode selected. The 1734-IE2V module reads a
voltage input between -10V or 0V (low) and +10V (high) dependent on mode
selected.
Channel Status
•
Channel Fault Description - General channel health bit indicates
whether the module is operating with or without faults. If any alarms or
faults are detected, this bit is set. Channel Status can be read on a per
channel basis or by reading the Channel Status Byte (Bit 0) in the
Module Produce Assembly.
•
Calibration Mode Bit - This bit (Channel Status Bit 1) is set when you
begin calibration. See the Calibrate Your Analog Modules chapter of this
manual for calibration details. When set, the channel status indicator
blinks green.
•
Low Alarm Value Bit - When the input signal is less than the Low Alarm
value, this bit (Channel Status Bit 2) is set. The default value for this
alarm is as follows:
•
1734-IE2C module is 3113 counts (3.8 mA)
•
1734-IE2V module is 500 counts = 500 mV (0.5V).
•
High Alarm Value Bit - When the input signal is more than the High
High Alarm value, this bit (Channel Status Bit 3) is set. The default value
for this alarm is as follows:
•
1734-IE2C module is 16547 counts (20.2 mA).
•
1734-IE2V module is 9500 counts = 9500 mV (9.5V).
Channel Status Byte
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
Over
Range Under
Range High High
Alarm Low Low
Alarm High
Alarm Low
Alarm CAL
Mode Channel
Fault