Rockwell Automation GMLC Reference Manual - Manual (Page 282)

Publication GMLC-5.2 - November 1999
Analog Offset 245
Immediately after the Analog Offset block executes, the axis moves from
the actual input starting value to find the entered analog setpoint. The
direction of the initial move depends upon the sign of the initial input
value and the polarity you select in the Analog Offset block.
Calculating the Analog Input Scalar
The analog input scalar adjusts the system response to the analog input as
reflected in the motion of the axis and may initially be estimated as
follows:
Note: This analog input scalar formula is only an estimate, and can
cause a softer response than required. You can decrease the
analog input scalar value for a sharper response, or increase it for
a softer response. You need to evaluate each analog offset
application individually, then adjust and test the scalar to provide
a proper system response within a tolerable safety margin.
Analog Input Scalar =
[Maximum Voltage or Current Range (V or A) of
Analog Input Sensor] [Servo Update Rate (Hz)]
[Maximum Velocity of Axis (Units / Sec)]
×
!
ATTENTION: A too small analog input scalar value can
cause the axis to oscillate, due to the slower Flex I/O module
response time.