Rockwell Automation 1734-SSI POINT I/O Synchronous Serial Interface Encoder Module Installation Instructions - Manual (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 2 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 0 7 6 5 4 3 2 1 0 Master ACK
byte
(1)
RES RES RES SCMP2 SCMP1 CC2 CC1 LACK
Consume 1 7 6 5 4 3 2 1 0 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.