Rockwell Automation 1756-HYD02 ControlLogix Hydraulic Servo Module - Manual (Page 70)

70 Publication 1756-UM525A-EN-P - June 2003
Chapter 4 Using the 1756-HYD02 Module Features
Limits Tab
Use the Limits tab to set the following parameters offline:
• Enable positive and negative software travel limits
• Set maximum positive and negative software travel limits
• Configure Position Error Tolerance
• Configure Position Lock Tolerance
• Set the module’s Output Limit
The parameters on this tab can be edited in two ways:
• Type parameter changes in the fields available on this tab and use the
OK or Apply buttons to save your edits.
• Edit in the Manual Adjust dialog. To do so:
a. Click on the Manual Tune button.
b. Use the increase/decrease arrows to edit parameter settings.
Your changes are saved the moment increase/decrease arrows change
any parameter value.
The parameters on this tab become read-only when the controller is online if
the controller is set to Hard Run mode, or if a Feedback On condition exists.
When RSLogix 5000 is offline, the following parameters can be edited and the
program saved to disk using either the Save command or by clicking on the
Apply button. You must download the edited program to the controller before
it can be run.
The table below lists the configurable features available on the Limits tab.
Feature: Definition:
Soft Travel Limits Enables software overtravel checking for an axis when Positioning Mode is set to Linear (on the Conversion
tab).
If an axis is configured for software overtravel limits, and if that axis passes beyond these maximum travel
limits (positive or negative), a software overtravel fault is issued. The response to this fault is specified by
the Soft Overtravel setting (on the Fault Actions tab). Software overtravel limits are disabled during the
tuning process.
When Soft Travel Limits are enabled, the travel limits are active even if the axis has not been honed or
before an absolute home position has been established. Under this condition, maximum positive and
maximum negative travel limit positions are not necessarily related to user-defined references.
Soft Travel
Limits:Maximum Positive Type the maximum positive position to be used for software overtravel checking, in position units. The
Maximum Positive limit must be greater than the Maximum Negative limit.
Soft Travel
Limits:Maximum Negative Type the maximum negative position to be used for software overtravel checking, in position units. The
Maximum Negative limit must be less than the Maximum Positive limit.