protocol are automatically generated by PLC. In the user program, reading and writing can
be done simply by specifying the station no. and memory address and executing SEND/
RECV instructions.
● Slave communication is performed when the computer or display connected to PLC has the
sending right, and sends commands, and PLC returns responses. In slave communication,
PLC responds automatically, so no program concerning communication is necessary on the
PLC side.
● The data size that can be sent or received in a single communication is up to 507 words for
register transmission (up to 1,014 words for MEWTOCOL7-COM) and 1 bit for bit
transmission.
Master function
PLC
RS-485
Master
Slave Slave Slave
Devices that
support
MEWTOCOL
slave function
Devices that
support
MEWTOCOL
slave function
Devices that
support
MEWTOCOL
slave function
Slave function
PLC PLC PLC
RS-485
Slave Slave Slave
Master
Devices that
support
MEWTOCOL
master function
■
Examples of applications of MEWTOCOL master communication
This is used for connection with a device that supports our PLC's protocol MEWTOCOL.
● Programmable controller FP series
● Displacement sensor HL series
● Eco power meter KW series
■
Examples of applications of MEWTOCOL slave communication
This is used for connection with a device that supports our PLC's protocol MEWTOCOL-COM
master communication.
● Programmable displays made by various manufacturers
1.2 Overview of Communication Functions
1-6 WUME-FP7COM-07
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