Rockwell Automation 1734-SSI POINT I/O Synchronous Serial Interface Absolute Encoder Module User Manual - Manual (Page 23)

1 Publication 1734-UM007D-EN-P - December 2005
Chapter
3
Communicate with Your Module
About This Chapter Read this chapter for information about how the 1734-SSI module
transmits SSI sensor data over the DeviceNet network.
About Communications Data can be exchanged with the master through a polled, cyclic, or
change-of-state connection. Bit-strobe Command Response Messaging
and the Unconnected Message Manager (UCMM) are not supported.
(1)
The module produces and consumes data as follows:
See the following tables for consume and produced bit and byte
definitions.
(1) If you are not familiar with these terms, see the DeviceNet Specification for definitions (online: www.odva.org).
I/O Connection Type Consumes Produces
Polled 2 bytes 10 bytes
Cyclic 2 bytes 10 bytes
Change-of-state 2 bytes 10 bytes
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 latched low SSI word. Bit 0
is the least significant bit of the entire
latched SSI word.
Produce 5 0…7 High byte of latched low SSI word.
Produce 6 0…7 Low byte of latched high SSI word.
Produce 7 0…7 High byte of latched high SSI word. Bit 7
is the most significant bit of the entire
latched SSI word.