Hardware configuration considerations, Scale, Timebase – Rockwell Automation 1398-PDM-xxx IQ Master Version 3.2.4 for IA-2000 and IQ-5000 Positioning Drive Modules, IQ-55 User Manual
Page 132: Scale timebase
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A Tutorial Introduction • Hardware Configuration Considerations
Publication 1398-PM601A-EN-P — October 2000
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log boxes there are groups of items with an underlined letter in the group name (for example the System
Values group in the Parameters System dialog box). The cursor can be moved quickly to this group by
pressing ALT+x where x is the underlined letter for that group. From there, the TAB and arrow keys can
be used as before.
When a button is highlighted (like the OK button in the following dialog) press the Enter key to activate
the button.
Hardware Configuration Considerations
Display the following dialog box by selecting the System menu item from the Parameters menu and set
up your dialog box to look like this one. In this example, the system will not be in the Absolute mode.
The Absolute Mode On check box should be left cleared (unchecked). You will not be able to enter val-
ues for Forward Limit, Reverse Limit, and Ereturn Position.
Scale
The Scale parameter tells the ULTRA Plus or IQ how many encoder counts to move when it is told to
move one unit. Setting the Scale to 8000 means that when told to move one unit, the motor will move
8000 pulses. For motors with 2000 line encoders (most standard Allen-Bradley motors) this will be one
revolution (since the encoders are read in full quadrature, 4 encoder counts per encoder line.) If your
motor has a different resolution encoder, enter the number of encoder counts per revolution in the Scale
box so that the units will be revolutions. The Rotation parameter tells the ULTRA Plus or IQ which
direction is forward: Clockwise or Counter-Clockwise while looking at the face of the motor. Tell the
ULTRA Plus or IQ to start using these new parameters by pressing the OK button.
Timebase
The next parameter that needs to be set is the Timebase. Select the Velocity/Acceleration menu item
from the Parameter menu to display the following dialog box.