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Rockwell Automation Publication 842E-UM001C-EN-P - September 2016
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 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.
Rather, it allocates a specific value to the mechanical rotary position of the
842E encoder. For example, the encoder zero position can be adjusted to the
zero point of the machine.
If the EtherNet/IP sets the preset value, the value must be within the total
working range that is configured (steps per revolution and number of
revolutions).
The preset push button (see
Figure 2 on page 41
and
Preset Push Button on
page 42
) is only operated when the encoder is powered and the green status
indicator is blinking or steady.
ATTENTION:
The preset function results in a change of position reading. The
change of position reading, causes unexpected motion, which could result in
personal injury and damage to the product or equipment. During preset,
steps are taken to confirm that the shaft is stationary and remains so.
IMPORTANT
Press the preset button briefly, no longer than one second.
