ElmoMC Multi-Axis Motion Controller-Maestro - Manual (Page 204)

11.1 Terms and Abbreviations
• Ethernet/IP device characterized by the unique network address (e.g. IP address)
(include Ethernet/IP scanners and adapters)
• Ethernet/IP Scanner (Rockwell) represents client side
• Maestro represents Ethernet/IP Adapter on the server
• Ethernet/IP Adapter is implemented on the Maestro and includes Ethernet/IP
server functionality and two general client functions for read/write data (tag
value) on another Ethernet/IP device (Rockwell)
• Tag (of Adapter/Scanner) is a named single variable or array
• Tag (of Adapter/Scanner) may be following types:
o
BOOL
o
SINT (1 byte)
o
INT (2 bytes)
o
DINT (4 bytes)
o
REAL (4 bytes)
• Assembly - Ethernet/IP object is used for I/O and CIP general message
communication
11.2 Types of Ethernet/IP Messages
EtherNet/IP and CIP transactions can be classified into two main categories: explicit and
implicit messaging. CIP provides implicit messaging for real-time I/O or control
messages. Explicit messaging is used for message exchange or informational messages.
The definitions below explain the different transmission types used.
• Information (explicit messaging)- Non-time critical data transfers— typically
have a large packet size. Information data exchanges are short-lived explicit
connections between a single originator and a single target device. Information data
packets use TCP/IP and take advantage of the TCP data handling features. I/O
connections are established via explicit messages once the connection is initiated.
• I/O Data (implicit messaging)- Time-critical data transfers— typically have a
smaller packet size. I/O data exchanges are long-term implicit connections between
a single originator and any number of target devices. I/O data packets use UDP/IP
protocols and take advantage of the high-speed throughput capability of UDP.
Maestro Software Manual Ethernet/IP Communication
MAN-MASSW (Ver. Q)
11-2