Rockwell-automation 1799-D12G12GL 12 Input/12 Output Discrete Embedded Manuel d'utilisateur télécharger pdf (Page 11)

11 12 Input/12 Output Discrete Embedded TTL I/O Module with Pulse Width Modulation and DeviceLogix

Publication 1799-IN008A-EN-P - July 2005

Communicate with the Module

The module exchanges I/O data with the master on DeviceNet through cyclic,

polled, or change-of-state messaging.

The module consumes and produces I/O data as follows:

Messaging Type Description

Cyclic The module produces and consumes I/O data

cyclically at the rate configured by the master on the

DeviceNet network.

Polled The master initiates communication by sending its

polled I/O message to the board. The board

consumes the message, updates any outputs and

produces a response containing the input data.

Change-of-State I/O data is produced when an input changes.

A heartbeat production occurs if no input condition

change occurs within the expected packet rate. This

heartbeat production tells the master that the board

is alive and ready to communicate. Consumption

occurs when data changes and the master produces

new output data to the board.

I/O Connection Type Consumes Produces

Cyclic 3 Bytes 6 Bytes

Polled 3 Bytes 6 Bytes

Change-of-State 3 Bytes 6 Bytes

1 2 ... 6 7 8 9 10 11 12 13 14 15 16 ... 23 24

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Rockwell-automation 1799-D12G12GL 12 Input/12 Output Discrete Embedded Manuel d'utilisateur Page 11