Rockwell-automation 1788-EN2DN Ethernet-to-DeviceNet Linking Device Instrukcja Użytkownika Pobierz pdf (Strona 27)

Ethernet-to-DeviceNet Linking Device 27

Rockwell Automation Publication 1788-IN055C-EN-P - September 2011

(Optional) Configure DeviceNet I/O

I/O Mapping

The DeviceNet I/O configuration defines the format of the Input and Output

tables, or the mapping of DeviceNet slaves’ I/O data to the I/O tables. As slaves

are added to the linking device’s DeviceNet scanner configuration, the location

in the I/O tables of each part of the slave’s I/O data is determined and stored.

To configure DeviceNet I/O, use RSNetWorx for DeviceNet software to set the

linking device’s scan list and I/O table mapping.

IMPORTANT

Steps 8 and 9 are required only if the linking device is used as an I/O scanner.

The linking device can function as a gateway/bridge, even if no I/O is

configured.

IMPORTANT

The organization of the I/O tables is very important. I/O tables define the

format of the data that will be provided to the EtherNet/IP scanner. The Input

and Output table formats should be planned and documented to be sure the

EtherNet/IP scanner is working with the correct data from the DeviceNet

network.

The size of the I/O data that can be exchanged with the EtherNet/IP scanner

(and, hence, the size of the I/O tables) is restricted as explained below.

• The Input table size cannot be larger than 496 bytes.

• The Output table size cannot be larger than 492 bytes.

• Either table may be empty (0 bytes).

IMPORTANT

Automap is used in this example for simplicity. In some cases, you may want

to organize the I/O data in other ways; you can do this using the Advanced

data table editor in the Input and Output tabs. Refer to RSNetWorx online

help for complete details.

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Rockwell-automation 1788-EN2DN Ethernet-to-DeviceNet Linking Device Instrukcja Użytkownika Strona 27