Rockwell-automation 1769-ADN Compact I/O 1769-ADN DeviceNet Adapter Instrukcja Użytkownika Pobierz pdf (Strona 34)

Publication 1769-UM001B-EN-P - October 2002

2-10 How Communication Takes Place and I/O Image Table Mapping

1769-OB16P Electronically

Protected Solid-State 24V

DC Output Module

Output Data

For each 1769-OB16P module, output data word 0 contains the

control program’s directed state of the discrete output points.

Input Data

For each 1769-OB16P 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 (Hold Last or User-Defined Safe State)

configuration

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

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 Instrukcja Użytkownika Strona 34