Rockwell Automation 1771-N SERIES High Resolution Analog Module User Manual - Manual (Page 49)

4–9 Configuring the Module
Publication 1771ĆUM127B-EN-P - December 2002
Clamping
Output channels can be configured to limit or clamp the output
signal at a specified value regardless of the output data value written
to the module. Low and high clamping values are written to the
module in scaled units, and must be within the absolute signal limits
shown below.
Output Type Low Absolute Limit High Absolute Limit
+ 10V Ć10.4V 10.4V
25mA 0mA 26mA
50mA 0mA 50mA
If either value is outside of these limits, or if the low clamp is higher
than the high clamp, the bad programming status bit (bit 07 in BTR
word 1) will be set.
When the clamp feature is activated (output from the programmable
controller is greater than the high clamp or lower than the low
clamp) a corresponding high or low clamp status bit is set in the
channel status word returned in the BTR.
Figure 4.2Clamped Outputs
High Clamp Limit
Low Clamp Limit
Time
output value sent by PLC processor
If the PLC processor commands
the output past the clamp limit,
the module will not output a value
outside the predetermined range.
Clamp the output
so that it cannot exceed
a predetermined range
(high and low clamp limit).
clamped output value
clamp active
clamp inactive