Rockwell Automation 1756-HYD02 ControlLogix Hydraulic Servo Module - Manual (Page 42)

42 Publication 1756-UM525A-EN-P - June 2003
Chapter 4 Using the 1756-HYD02 Module Features
What This Chapter Contains This chapter is broken into the two sections.
Using General
Module Features The general module features include:
• Servo Update Period
• Module Fault Reporting
• Fully Software Configurable
• Electronic Keying
Servo Update Period
Servo update period is the period at which the position feedback is sampled
and the loop is closed to generate a new output value. The time of this period
is a user-defined setting. You can choose from one of the following settings:
• 250 μ s
• 500 μ s
• 1000 μ s
• 1500 μ s
• 2000 μ s
With LDTs, the minimum Servo Update Period is dependent on the length of
the transducer. Use the Calculated Values tool on the Feedback tab of the Axis
properties dialog in RSLogix 5000, in conjunction with the response of your
hydraulic application, to calculate suggested minimum update periods. The
coarse update period of the associated motion group must be at least 3x the
maximum configured 1756-HYD02 module servo update period or
RSLogix 5000 will generate an error.
Section: Description: Begins on
page:
Using General
Module Features This section describes features that affect the
module in a general sense. For example, the
1756-HYD02 module offers electronic keying
options that you can configure to set the degree of
protection your application needs against using
the wrong 1756-HYD02 module. 42
Using Axes
Features This section describes features that are specific to
the axes connected to channels 0 and 1 on the
1756-HYD02 module. 52