Rockwell Automation GMLC Reference Manual - Manual (Page 217)

Publication GMLC-5.2 - November 1999
180 Control Setting Blocks
When the servo output is being clamped at the servo output limit
• Output_limit_status = 1
• Axis_status = 5 if no faults are active
When the servo output of an axis is not being clamped at the servo output
limit
• Output_limit_status = 0
• Axis_status
≤
4 if no faults are active on the axis
Unit Settings
If the motion controller is a 1394 or a Compact, you can specify the servo
output in volts, percentage of full scale, or mA as required by your
application. The Compact (IMC-S/23x models) provides a user-
configurable servo output that can be set for ±10V (standard) or ±150 mA
output (for use with hydraulic servo and proportional valves).
Integrated (IMC-S/21x models) and Basic (IMC-S/20x models) motion
controllers provide a ±10V servo output for each physical axis. If you are
using one of these motion controllers, you can specify the servo output
either directly in volts or as a percentage of full scale as required.
Using the Servo Output Limit
You can use the servo output limit as a software current or torque limit
(clamp) if you are using a servo amplifier in torque (current) mode. The
maximum command the motion controller ever sends to the servo
amplifier, is equal to the specified servo output limit. For example, if your
amplifier is capable of 30 Amps of current for a 10 Volt input, setting the
servo output limit to 5 Volts or 50% limits the maximum motor current to
15 Amps.
You can also use the servo output limit if your servo amplifier cannot
accept the full ±10 Volt range of the motion controller’s servo output. For
example, if your servo amplifier can only accept command signals up to
±7.5 Volts, set the servo output limit to 7.5 Volts or 75%.