Rockwell Automation 842E EtherNet/IP Absolute Encoder User Manual - Manual (Page 48)

40 Rockwell Automation Publication 842E-UM001A-EN-P May 2012
Chapter 6 Configuring the 842 E encoder using RSLogix 5000
Configuration Default encoder settings
The 842E EtherNet/IP encoder is supplied with the following parameters:
• Direction = clockwise
• Scaling = none
• Steps per revolution = 262,144
• Total resolution = 1,073,741,823
• Preset = 0
• Velocity measuring unit = rpm
Preset function
The 842E encoder position value is set to zero when the preset function is
executed (by the preset push button or EtherNet/IP). This predefined value is
stored in the EEPROM. The factory default preset value is zero.
The preset function is not intended for use in dynamic parameter setting
operations but as an electronic adjustment function during commissioning, in
order to allocate a specific value to the mechanical rotary position of the 842E
encoder.
If the preset value is set by EtherNet/IP, the value must be within the total
working range currently configured (steps per revolution and number of
revolutions).
The preset push button (see figure on page 19 and “Preset push button” on page
20) should only be operated when the encoder is powered and the green LED is
blinking or steady.
ATTENTION
The preset function results in a change of position reading. This can cause
unexpected motion which could result in personal injury and damage to the
product or equipment. During preset, steps should be taken to ensure the shaft
is stationary and will remain so.
IMPORTANT Press the preset button briefly, no longer than one second.