Rockwell-automation 1734-SSI POINT I/O Synchronous Serial Interface En Manuel d'utilisateur télécharger pdf (Page 13)

POINT I/O Synchronous Serial Interface Absolute Encoder Module 13

Publication 1734-IN581D-EN-E - January 2014

Consume and Produce Bit/Byte Definitions

Byte Bit

Produce 0 0…7 Low byte of present low SSI word. Bit 0 is the least significant bit of the

entire present SSI word.

Produce 1 0…7 High byte of present low SSI word.

Produce 2 0…7 Low byte of present high SSI word.

Produce 3 0…7 High byte of present high SSI word. Bit 7 is the most significant bit of the

entire present SSI word.

Produce 4 0…7 Low byte of stored low SSI word. Bit 0 is the least significant bit of the

entire stored SSI word.

Produce 5 0…7 High byte of stored low SSI word.

Produce 6 0…7 Low byte of stored high SSI word.

Produce 7 0…7 High byte of stored high SSI word. Bit 7 is the most significant bit of the

entire stored SSI word.

Consume and Produce Bit/Byte Definitions

Byte Bit Description

Produce 8 7 6 5 4 3 2 1 0 Status byte 0

(1)

C2ST C1ST C2R C1R INC DEC RUN I1

Produce 9 7 6 5 4 3 2 1 0 Status byte 1

(2)

RES RES RES LHON IDF

CCE CCF SPF

(1)

For detailed descriptions of these bits, see 1734-SSI User Manual, publication 1734-UM009.

(2)

Monitor IDF to determine the validity of the produced data. If IDF=1, the SSI data is false.

Consume and Produce Bit/Byte Definitions

Byte Bit Description

Consume 07654 3 210 Master ACK

byte

(1)

RES RES RES SCMP2 SCMP1 CC2 CC1 LACK

Consume 17654 3 210 CONS1

RES RES RES RES RES RES RES RES

(1)

The master must provide the master ACK byte to receive the polled produced bytes 0…9.

1 2 ... 8 9 10 11 12 13 14 15 16 17 18 19 20

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Rockwell-automation 1734-SSI POINT I/O Synchronous Serial Interface En Manuel d'utilisateur Page 13