Rockwell Automation 1738-SSIM23 ArmorPoint I/O SSI Absolute Encoder Module, Series A - Manual (Page 8)

Publication 1738-IN013A-EN-E - June 2004
8 ArmorPoint I/O Synchronous Serial Interface (SSI) Absolute Encoder Module, Series A
Communicate With
Your Module
The 1738-SSIM23 module transmits SSI sensor data over the
DeviceNet™, ControlNet™, Ethernet
® , and PROFIBUS network. Data
can be exchanged with the master through a polled, cyclic, or
change-of-state connection. The module produces 10 byes of data and
consumes 2 bytes of data.
Default Data Map for the ArmorPoint Absolute Encoder Module
1738-SSIM23
Message Size: 10 Bytes
Consume and Produce Bit/Byte Definitions
Byte Bit Description
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.
Byte Bit Description
Produce 8 7 6 5 4 3 2 1 0 Status Byte 0
C2ST C1ST C2R C1R INC DEC RUN I1
Produce 9 7 6 5 4 3 2 1 0 Status Byte 1
RES RES RES LHON IDF 1 CCE CCF SPF
1 Monitor IDF to determine the validity of the produced data. If IDF=1, the SSI data is false.