Rockwell Automation 1756-HSC ControlLogix High Speed Counter Module User Manual
Page 18
Rockwell Automation Publication 1756-UM007C-EN-P - November 2011
18 Counter Modes
• Encoder x1- This is a Bidirectional Count mode, counting up or down,
using an incremental encoder with direction output.
• Encoder x4 - This is a Bidirectional Count mode, using quadrature
encoder signals, with four times the resolution of X1.
The 1756-HSC/B module also offers the convenience of showing directional
frequency by using any Counter mode. If the count value is increasing, the
frequency is positive in the Totalizer tag. If the count value is decreasing, the
frequency is negative in the Totalizer tag.
There are several methods for using and manipulating the count values. Based
on the state of the Z-input, the 1756-HSC module provides four modes of
behavior if the application requires storage of the accumulated count value.
•
•
Store, Wait, and Resume
•
Store and Reset, Wait, and Start
•
Store and Reset, and Start
In addition, the 1756-HSC module features two software-configurable tags
that provide control of the starting and ending points of an accumulated count
sequence. These are the tags:
•
•
The remainder of this chapter details each mode and the different
configurations that you can use for specific needs of your
1756-HSC/B module.
Where Count Values are Stored in Tags
Mode Description
Present Value Tag
Stored Value Tag
Totalizer Tag
Counter
Accumulated Count
Stored Value
Directional Frequency
Encoder x1
Encoder x4