Rockwell-automation 1769-ADN Compact I/O 1769-ADN DeviceNet Adapter Manual de usuario descargar pdf (Pagina 36)

Publication 1769-UM001B-EN-P - October 2002

2-12 How Communication Takes Place and I/O Image Table Mapping

1769-OV16 Solid State 24V

DC Sink Output Module

(16 Point)

Output Data

For each 1769-OV16 module, output data word 0 contains the control

program’s directed state of the discrete output points.

Input Data

For each 1769-OV16 module, input data word 0 contains the state of

the module’s output data (output data echo) word 0. 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)

Word

Bit Position

1514131211109876543210

0wwwwwwwwwwwwwwww

w = write

Word

Bit Position

1514131211109876543210

0rrrrrrrrrrrrrrrr

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 36