9.5 Explicit Message
All connections in EtherNet/IP can be divided into explicit messaging connections and implicit (or I/O) messaging
connections. Explicit messaging uses TCP/IP and request/response communications or client/server connections,
requiring that the instruction include the memory location of the data to be sent to the client. Implicit messaging uses
UDP/IP, in which a server sends information from predefined memory locations to a client at a given interval, using a
requested packet interval (RPI) parameter to specify the interval. For details on using implicit messages, please refer to
Section 9.4.5. This section provides an overview of how the AS Series uses explicit messaging instructions.
When EtherNet/IP uses CIP Objects as parameters and the AS Series PLC CPU acts a Scanner, you can use the
EIPRW instruction (API 2208) to read and write Adapter’s objects. Each object includes various parameters, you need to
obtain relative object parameters from the Adapter’s manual. For details on the EIPRW instruction (API 2208), please
refer to the AS Series Programming Manual. For details on Objects that are supported by the AS Series, please refer to
Section 9.8.
9.6 Troubleshooting
This section provides an overview of error codes and troubleshooting for the AS Series.
9.6.1 Error Code Classification
There are two types of error code categories for the AS Series: Configuration Errors, and Application Errors. These error
codes are defined by the ODVA for EtherNet/IP errors. Refer to the following table for AS Series error codes.
Error Code Classification
Description
1
st
Phase 2
nd
Phase
Category Item
Configuration error
EDS files mismatched
Mismatched EDS files lead to I/O connection
failure. *
Data exchange setup error
Data exchange setup error lead to I/O
connection failure. *
Application error Ethernet/IP error EtherNet/IP communication failure *
* Only the last 2 bytes of the error code are shown; for example, only 011C appears for the error code H’1101011C.
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