Rockwell Automation 1769-IF4FXOF2F Compact Combination Fast Analog I/O Module - Manual (Page 54)

54 Publication 1769-UM019A-EN-P - October 2008
Chapter 3 Module Data, Status, and Channel Configuration
Enable Ramping (ER)
If the selection is enabled (ER = 1), the module controls the ramp rate
of the output when the system transitions from Run to Fault mode
based on the value entered in the channel’s ramp-rate configuration
word. If the selection is disabled (ER = 0), no ramping control of the
output is provided. The default setting is disabled.
Ramp Rate
The ramp rate is defined in terms of the selected range/format in units
per second. For example, in the 0…20 mA range and percent full
scale format, a ramp rate of 1050 is 10% per second (2 mA/s), since
1050 is 10% of the total number of counts in the full scale of the
0…20 mA range when using percent full scale format.
This table describes how the ramp rate is determined for all output
types/ranges and output data formats.
TIP
N
Not all controllers support alternate output states and this
function. Refer to your controller’s user manual for details.
Ramp Rates for Output Type/Range and Data Formats
Output Data Format Output Type/Range Total Counts in Full Scale Number of Counts for
Every 1% of Ramp Rate
Real Units/Second for
Every 1% of Ramp Rate
Proportional Counts
-10…10V DC
65,334 (1) 652
0.20V/s
0…5V DC 0.05V/s
0…10V DC 0.10V/s
1…5V DC 0.04V/s
0…20 mA 0.20 mA/s
4…20 mA 0.16 mA/s
Engineering Units
-10…10V DC 21,000 208 0.20V/s
0…5V DC 5,748 56 0.05V/s
0…10V DC 11,000 108 0.10V/s
1…5V DC 4,748 48 0.04V/s
0…20 mA 21,000 208 0.20 mA/s
4…20 mA 17,800 176 0.16 mA/s
Scaled for PID
-10…10V DC 17,203 172 0.20V/s
0…5V DC 18,840 188 0.05V/s
0…10V DC 18,021 180 0.10V/s
1…5V DC 19,452 195 0.04V/s
0…20 mA 17,200 172 0.20 mA/s
4…20 mA 18,224 180 0.16 mA