Rockwell-automation 845GM Absolute Encoder, Size 20 Manual de usuario descargar pdf (Pagina 3)

Electrical Connections for SSI Output—12 Pin Connector

Catalog Number Wire Pair Wire Color Function Pin

Red/Black/Shield

Red +DC Input 8

Red/Black/Shield

Black DC Common 1

White/Black/Shield

White Clock + 3

845-CA-G-

White/Black/Shield

Black Clock - 11

845

-__

(With 12 pin connector

Blue/Black/Shield

Blue Data + 2

Blue/Black/Shield

Black Data - 10

Green/Black/Shield

Green Direction Control 12

Green/Black/Shield

Black Reset 9

Direction Pin

The Direction Pin can change function with code type. In

parallel type Gray Code encoders, its function is Most

significant Bit Complement or MSBC for short. In Natural

Binary, Binary Coded Decimal and Gray Code SSI encoders,

its function is Direction Control.

Direction Control Ê

Natural Binary and BCD

A logic “1” (+DC or open) on the direction control pin will

produce increasing counts with a counter- clockwise rotation

of the shaft. A logic “0” (DC common) on the direction control

pin will produce increasing counts with a clockwise rotation of

the shaft.

Gray Code (SSI)

A logic “1” (+DC or open) on the direction control pin will

produce increasing counts with a clockwise rotation of the

shaft. A logic “0” (DC common) on the direction control pin will

produce increasing counts with a counterclockwise rotation of

the shaft.

Gray Code (parallel)

Counterclockwise rotation of the shaft will produce increasing

counts. For increasing counts with a clockwise rotation, use

the Most Significant Bit Complement Pin instead of the Most

Significant Bit Pin. See Electrical Connection table for pin

designation.

ATTENTION: For parallel gray code: connecting the

MSB or MSBC to +DC will result in permanent

damage to the encoder.

Reset Pin

The shaft must be stationary before using the reset function.

Connecting the Reset Pin to +DC will reset Natural Binary and

BCD position value to zero. Connecting the Reset Pin to +DC

will reset Gray Code position value to maximum (e.g., 255,

511, 1023, etc.) if MSBC is used, to zero if MSB is used. The

reset function requires a connection to +DC for 0.1 seconds or

longer.

ATTENTION: Activating the Reset Pin results in a

change of position reading. This can cause

unexpected motion which could result in damage to

the product, equipment, or personal injury.

Ê Rotation is viewed from the end of the encoder shaft.

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Rockwell-automation 845GM Absolute Encoder, Size 20 Manual de usuario Pagina 3

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