Rockwell Automation 1769-OF4 Compact Analog Output Module - Manual (Page 38)

38 Publication 1769-UM020A-EN-P - December 2009
Chapter 3 Module Data, Status, and Channel Configuration
Output Ramping
Ramping limits the speed at which an output signal can change. This
prevents vast transitions in the output from damaging the output
controls.
Ramp to Fault mode is the only type of ramping supported by the
module. This type of ramping occurs when the present output value
changes to the fault value after a change in the controller's status to
Fault mode has occurred.
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.
TIP
N
Not all controllers support alternate output states and this
function. Refer to your controller’s user manual for details.