Delta MMC120 User Manual download pdf (Page 31)

MMC120 Linear Motion Control Module Motion Control Parameters

Delta Computer Systems, Inc. 360/254-8688 31

9.0110(µs/in) x 120 (MHz)

Example 2

For a system using a magnetostrictive transducer with a calibration number of 9.0110 µs per inch and

a position unit of 0.1 millimeter, the SCALE will be:

254(Position Units Per Inch) X 32768

SCALE =  = 7697

9.0110(µs/in) x 120 (MHz)

OFFSET (Default: 0)

OFFSET is used to shift the ACTUAL POSITION with respect to the transducer zero. The OFFSET is

specified in Position Units and is equal to the desired ACTUAL POSITION at zero TRANSDUCER

COUNTS. It is defined as:

(P0 - P1)

OFFSET = P0 -  xC0

(C0 - C1)

The P0 and P1 commands can help calculate the OFFSET parameter. See page 82 for additional information.

CAUTION: When using OFFSET, you must be familiar with the limitations of 16 bit math.

EXTEND LIMIT (Defaults to current position on power-up)

The EXTEND LIMIT specifies the maximum requested position value that the MMC120 will allow as a

COMMAND VALUE. (When the SCALE is negative, this is the minimum value.) A COMMAND VALUE

that exceed this value will be set to the EXTEND LIMIT, and the PARAMETER ERROR bit (bit 5) in the

STATUS word will be set. The EXTEND LIMIT is given in Position Units. On startup the EXTEND LIMIT

defaults to the current position of the axis. New EXTEND and RETRACT LIMITS must be issued with a 'P'

command before the axis will move.

NOTE: The EXTEND LIMIT must be changed when the SCALE or OFFSET parameters are changed. Extending

is the direction that gives increasing TRANSDUCER COUNTS.

RETRACT LIMIT (Defaults to current position on power-up)

The RETRACT LIMIT specifies the minimum value the MMC120 will allow as a position COMMAND

VALUE. (When the SCALE is negative, this is the maximum value.) A COMMAND VALUE below this

value will be set to the RETRACT LIMIT. The RETRACT LIMIT is given in Position Units. On startup the

RETRACT LIMIT defaults to the current position of the axis. New EXTEND and RETRACT LIMITS must

be entered, then a 'P' command sent, before the axis will move.

NOTE: The RETRACT LIMIT must be changed when the SCALE or OFFSET parameters are changed.

PROPORTIONAL GAIN (Default: 1) Range: 0 to 65535

The PROPORTIONAL GAIN specifies the amount of drive added to the output for each unit of position error.

It is defined as:

1 2 ... 26 27 28 29 30 31 32 33 34 35 36 ... 104 105

No comments

Delta MMC120 User Manual Page 31