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9.5
MELSEC / SLMP Server
9.5.1 Overview
The Mitsubishi MELSEC communication protocol (MC protocol) is also known as SLMP (Seamless
Messaging Protocol). It is an application-level protocol implemented on top of the Ethernet TCP/IP and
UDP/IP layers that is typically used to read and write data from/to devices supporting compatible 4E
(MT), 3E (ST) and 1E frame types. As a server device, the interface card is waiting for a client device to
initiate a request. The interface card will then respond with the appropriate data.
For more information regarding the MELSEC protocol, refer to the Mitsubishi MELSEC Communication
Protocol reference manual. The SMLP specification is available from CLPA (CC-Link Partner
Association).
Other notes of interest include:
Supports both TCP and UDP simultaneously.
•
Supports up to 8 simultaneous TCP connections.
•
The TCP port is user-configurable.
•
The UDP port is user-configurable and defines both the local source port as well as the remote
•
destination port.
•
The max frame size is 1460 bytes.
PROTOCOL-SPECIFIC INFORMATION
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