Rockwell-automation 1769-ADN Compact I/O 1769-ADN DeviceNet Adapter Manual de usuario descargar pdf (Pagina 38)

Publication 1769-UM001B-EN-P - October 2002

2-14 How Communication Takes Place and I/O Image Table Mapping

1769-OW8I Individually

Isolated AC/DC Relay

Output Module (8 Point)

Output Data

For each 1769-OW8I module, output data word 0 contains the control

program’s directed state of the discrete output points. Bits 8 to 15 are

not used.

Input Data

For each 1769-OW8I module, input data word 0 contains the state of

the module’s output data (output data echo). During normal operation

(controller in Run), these input bits represent the logic state that the

outputs are directed to by the control program. They are also

dependent upon the:

• Program Mode configuration (Hold Last or User-Defined Safe

State)

• Fault Mode configuration (Hold Last or User-Defined Safe State)

For the 1769-OW8I, input data word 0 bits 8 to 15 are not used.

Word

Bit Position

1514131211109876543210

0 0 0 0 0 0 0 0 wwwwwwww

w = write

Word

Bit Position

1514131211109876543210

0 0 0 0 0 0 0 0rrrrrrrr

r = read

IMPORTANT

The output module’s input data reflects the output

data echo of the module, not necessarily the

electrical state of the output terminals. It does not

reflect shorted or open outputs.

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Rockwell-automation 1769-ADN Compact I/O 1769-ADN DeviceNet Adapter Manual de usuario Pagina 38