Rockwell Automation 1794-ID2 U.MNL INCREMENTAL ENCODER - Manual (Page 75)

Chapter
7
Publication 1794ĆUM015B-EN-P - May 2001
Calibrating Your Incremental
Encoder Module
In this chapter, we tell you how to set up your system to calibrate the
incremental encoder.
The incremental encoder module does not require calibration.
However, you must synchronize the module with the process you are
monitoring.
You must have your incremental encoder module installed in an
operating FLEX I/O system in order to complete synchronization.
Process calibration of the counter synchronizes the control system
with the machinery where the incremental encoder is mounted. The
counter is set to a preset value when a reference pulse is received.
Use input Z to activate calibration. The input to Z can be a zero pulse
integrated with an incremental encoder. Or input Z can come from
another transmitter independent of the pulse transmitter. Calibration
is performed at the first positive edge of input signal Z and is
independent of the signal duration.
Calibration is enabled if CalEnable = 1 or if GateControl = 3 and G
input = 1. The counter direction must coincide with CalDirection and
Calibrated must be = 0 (acknowledged by a positive edge on
CalReset). When calibration is activated, the counter is given the
value in PresetValue and Calibrated will be set. The counter value
can be saved in StoreValue if StoreControl = 0 and Stored = 0. Note
that the condition for the latch function is not dependent on the
direction and therefore does not automatically occur on that edge of
Z which activates calibration.
Chapter Objective
Calibrating Your Module