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5 Implementation of EtherNet/IP
5.2 Classes and instances of the EtherNet/IP-gateway
XI/ON: XNE-GWBR-2ETH-IP 09/2011 MN05002007Z-EN www.eaton.com
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Message Router Request/Response Formats
• Message Router Request Format:
• Message Router Response Format:
Table 16:
Message
Router Request Parameter Data type Description
Service USINT Service code of the request.
Request Path
Size USINT Number of 16 bit words in the "Request Path".
Request Path Padded
EPATH Array of bytes containing the information for the path of
request (class ID, Instance ID, etc.) for this transaction.
Request Data Array of octed Additional service specific data to be delivered in the Explicit
Messaging Request.
Table 17:
Message
Router Request Parameter Data type Description
Reply Service SINT Reply service code.
General Status USINT General Status code according to CIP specification.
See Table 18: General status codes according to CIP spec.,
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Size of
Additional
Status USINT Number of 16 bit words in Additional status.
Additional
Status Array of
USINT Additional status.
Response
Data Array of octet Response data from request or additional error data if an
error was indicated in "General Status".
Table 18:
General status
codes according
to CIP spec. Status
code
(hex) Status name Description
00 Success Service successfully performed by the object specified.
01 Connection failure A connection related service failed along the connection
path.
02 Resource unavailable Resources needed for the object to perform the requested
service were unavailable.
03 Invalid
parameter value See Status code 0x20, which is the preferred value to use
for this condition.
04 Path segment error The path segment identifier or the segment syntax was not
understood by the processing node. Path processing shall
stop when a path segment error is encountered.