Eaton XN-GW Series, Руководство пользователя

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5 Implementation of EtherNet/IP
5.2 Classes and instances of the EtherNet/IP-gateway
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XI/ON: XNE-GWBR-2ETH-IP 09/2011 MN05002007Z-EN www.eaton.com
Common services
Mapping of process data
The process image of the XI/ON gateway is depicted in WORD format (16 bit). The process
data of successive modules of the same type, with process data of less than 1 word, are
grouped together until 16 bits of process data is reached. The process data is written in a new
word when:
• 16-bit input data is reached and further input modules follow
• 16-bit output data is reached and further output modules follow
• An input module, whose process data length cannot be completely incorporated in the
preceding word, follows on from another input module
• An output module, whose process data length cannot be completely incorporated in the
preceding word, follows on from another output module
Table 21:
Common
services Service
code Class Instance Service name
01 (0x01) yes yes Get_Attribute_All
14 (0x0E) no yes Get_Attribute_Single