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Communication Functions of CPU Unit
1.3 Overview of Communication Functions
1.3.1 MEWTOCOL-DAT Master/Slave Communication
(Binary Communication)
Overview of function
• Execute communication using MEWTOCOL-DAT, a communication protocol usd by our PLC.
• One of the PLC has the sending right, and executes communication by sending commands
to PLCs that support MEWTOCOL-DAT, and receiving responses.
• The slave-side PLC responds automatically, so no program concerning communication is
necessary.
• Also on the master-side PLC, messages in accordance with the protocol are automatically
generated by PLC. In the user program, reading and writing can be done between PLCs
simply by specifying the station no. and memory address and executing SEND/RECV
commands.
• This is suitable for sending/receiving data between PLCs, because the data size that can be
transmitted in a single communication is larger, and the transmission format is simpler and
shorter, than the MEWTOCOL-COM communication (ASCII communication).
• The data size that can be sent or received in a single communication is up to 2038 words for
register transmission and 1 bit for bit transmission.
(Note) In the case of connection with our PLC FP2 ET-LAN unit, the maximum size is 1020 words.
FP7 CPU
IP XXXXXX
Master
communication
Slave
communication
Purpose of MEWTOCOL-DAT communication
This is used for sending data with our PLC that supports MEWTOCOL-DAT via Ethernet.
• Programmable controller FP series
KEY POINTS
•
When MEWTOCOL-DAT master/slave communication is used, select
"TCP/IP" for the communication protocol in order to guarantee the reliability
of communication.
1-6
Ethernet LAN
Command
Response
Send/receive data using
MEWTOCOL-DAT
Command
Response
Our PLC supporting
MEWTOCOL-DAT
IP XXXXXX
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