Rockwell-automation 1734-SSI POINT I/O Synchronous Serial Interface Ab Manual de usuario descargar pdf (Pagina 23)

1 Publication 1734-UM007D-EN-P - December 2005

Chapter

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.

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Rockwell-automation 1734-SSI POINT I/O Synchronous Serial Interface Ab Manual de usuario Pagina 23