Rockwell-automation 1738-ADNX ArmorPoint I/O DeviceNet Adapters Instrukcja Użytkownika Pobierz pdf (Strona 36)

Publication 1738-UM001A-EN-P - February 2005

2-20 What Is the ArmorPoint DeviceNet Adapter?

The four data transfers are not necessarily sequential. Transfers 2 and

3 typically occur more frequently than transfers 1 and 4.

Image Table Mapping

Your adapter receives data from:

• master devices (e.g., scanners) - output data is then passed to

ArmorPoint I/O modules

• input modules - input data is passed to the scanner

The adapter must map the data it receives to its internal memory

before passing it to the appropriate device. The I/O map for a module

is divided into:

• read bytes - input and status bytes

• write bytes - output and configuration bytes

The data is mapped by 3 buffers for input data (each representing an

I/O connection on the primary DeviceNet) and 1 buffer for output

data (representing data sent for Poll or COS connections on the

primary DeviceNet).

The number of read bytes or write bytes can be 2 or more. The length

of each I/O module's read bytes and write bytes vary in size

depending on module complexity. Each I/O module supports at least

1 input byte or 1 output byte. Status and configuration are optional,

depending on the module.

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Rockwell-automation 1738-ADNX ArmorPoint I/O DeviceNet Adapters Instrukcja Użytkownika Strona 36