Baumer GXAMS Посібник - Сторінка 20

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Device-specific parameters

•

Code sequence

Behaviour of position data relating to the sense of rotation of the encoder shaft when looking at the

flange.

CW („clockwise") = Ascending values with clockwise rotation

CCW („counter-clockwise") = Ascending values with counter-clockwise rotation

•

Steps per turn

Parameterization of the desired singleturn resolution („steps per revolution", „measuring units per

revolution"). Allowed parameters range from 1 to the maximum encoder resolution. The

parameterization software signals the limits.

Re-parameterization may clear the previous preset offset value (see "note" under 6.5. Preset

function) so that any current position reference will be lost.

•

Total measuring range

Parameterization of the required total measuring range, „TMR".

With singleturn encoders it must be the same parameter as entered for the singleturn resolution

("Measuring units per revolution").

Admissible values range from 2 to the product of the programmed resolution multiplied by the

encoder's maximum number of revolutions.

Any alteration of the total measuring range clears the previous preset offset value (see under 6.5

Preset Function)

Important note for multiturn encoder operation

This encoder supports „Endless Operation" automatically if required.

Thus, there are no special requirements for the encoder parameters "total measuring range" and

"measuring units per revolution" to stand in a certain ratio.

With endless operation active, the encoder shaft must not rotate when the encoder is not

powered. In those cases where powerless motion cannot be avoided, the encoder has to be

referenced (presetted) after each power-up. With Endless Operation inactive, the encoder shaft may

rotate unlimited when encoder not powered.

How to determine if „Endless Operation" is in use:

• Multiply the encoder's „max. possible revolutions" (depending on encoder 16 bit = 65536 or 13 bit

= 8192) by your chosen parameter „measuring units per revolution".

• Divide this value by your chosen „total measuring range".

• If there is a division remainder, endless operation is in use.

Example for parameters without endless operation:

Maximum possible revolutions

Measuring units per revolution

Total measuring range

Calculation:

Example for parameters with endless operation:

Maximum possible revolutions

Measuring units per revolution

Total measuring range

Calculation:

Manual_PROFINET_EN.doc

17.10.11

65536

(16 bit multiturn)

3600

29.491.200

(8192 x 3600)

65536 x 3600 / 29.491.200 = 8 (no remainder)

65536

(16 bit multiturn)

3600

100.000

65536 x 3600 / 100.000 = 2359 remainder 29600

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