AMETEK 2120 PLC Interface Module - Manual (Page 27)

Installation and Programming Manual
Chapter 4: Programming
23
The shift key is used to move to a specifi c digit shown on the Interface
Module’s LED display. This can be done to either select a function number
or a value for a function. To move to a specifi c digit on the display, select
the function key and then the shift key. The right-most digit will then fl ash.
This indicates that the digit is activated to be incremented. (To increment
the digit, select the scroll key.) Continue to select the shift key until the
desired digit is activated.
The enter key is used for several purposes. For example, it is selected after
a function number is displayed. This begins the programming process for
the selected function. The enter key is also used to program a value in a
function. This is done by selecting the enter key after the desired value is
displayed on the monitor’s screen.
To customize the Interface Module to your specifi c resolver and application, you must fi rst make
some confi gurations. These confi gurations are made through the use of resolver confi guration
functions, which are described in this section. Perform these confi guration procedures before
entering other function values. After the resolver input has been confi gured, you may proceed on
to function 305 ( Display Power Up) and 307 (Resolver Reset-to-Preset).
Scale Factor (300)
Turns Counting (301)
Position Offset (302)
Turns Counting Wrap Around (308)
Scale Factor (300)
The Scale Factor function is used to program the number of counts or the resolution that one
revolution of the resolver results in. For example, when the function is programmed with a value
of 100, the Interface Module will count from 0 to 99 as the resolver completes a full revolution.
The default value for this function is 4096.
Turns Counting (301)
The Turns Counting function defi nes the number of revolutions the resolver must rotate before
the scale factor is reached. For example, when this function is set at 2 and the scale factor is
set at 100, the resolver will have to make two full revolutions before 100 counts is reached.
The Turns Counting Function can be disabled by setting its value to 0. When disabled, the
scale factor will cover its entire range in one revolution and roll over to 0 after one complete
revolution. When the Turns Counting function is set to 1, the total count will increase by the
scale factor for each revolution. For example, if the scale factor was set at 100 and turns counting
at 1, after fi ve revolutions, the monitor would display 500 counts. The default value for this
function is 0.
4.1: Resolver Input Confi guration Functions