Serial Output Specification

Index Processing

A unique physical position is referenced on all gratings and is called an index position. The value of this position is determined during an index capture routine initiated by a button press or the SmartPrecision Software and is permanently stored for use after power cycling. The index value has the same resolution as the interpolated position.

The M3000SiDAA has four modes of operation that use the index position to generate a physical reference position. The posi- tion word calculated by the M3000SiDAA electronics is a 28-bit number, which includes 18 fringe counter bits and 10 sub- fringe interpolation bits. The fringe counter keeps track of the number of electrical cycles encountered caused by a grating moving past a sensor and can be reset. The sub-fringe position is absolute because the voltage relationship between sine and cosine are fixed electrically and therefore cannot be reset or cleared.

A physical mark on the grating called an index window is used to generate an accurate index position. The index window is approximately one fringe wide. By monitoring the edges of the window with respect to the absolute sub-fringe position during the index capture mode, an accurate index position is calculated and stored.

At power up the encoder is in an undefined position relative to the outside world. By traveling past the index mark on the scale and knowing where the index is relative to the outside world the encoder position becomes defined. The M3000SiDAA sup- ports the following index processing modes:

No Index: No changes are made to the position word at the index mark.

Mode 1: Zeros the fringe counter at the first encounter with index mark after power up.

Mode 2: Zeros the fringe counter at every encounter with index mark.

Mode 3: Zeros the fringe counter at the first encounter with index mark after power up and subtracts the index position from the calculated position making the index mark the zero position of the encoder.

Mode 4: Zeros the fringe counter at every encounter with index mark after power up and subtracts the index position from the calculated position making the index mark the zero position of the encoder.

The Index mode can be factory set or selected by the customer using the optional SmartPrecision software.

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AB Soft Mercury 3000Si manual Index Processing
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Mercury 3000Si specifications

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