5.7 MEWTOCOL communication with I/O type
For 1:N topology with I/O type, using master’s I/O can not control slave’s I/O. In order to control I/O
of master and slave, connect computer or PLC in the upper level and control by command from
upper level. (except [I/O] 1:N topology for report)
In this case, wireless unit is located in the same as equipment with MEWTOCOL protocol.
And transferring data to equipment with MEWTOCOL protocol connected to slave can execute via
slave by registering as terminal using setting tool.
Display board
This chapter explains about the overview of MEWTOCOL-COM that can be used for KR20 wireless
unit.
5.7.1 Overview of MEWTOCOL-COM
Command and response functions
The computer sends commands (instructions) to Wireless unit, and receives responses in return.
This enables the computer and Wireless unit to converse with each other, so that various kinds of
information can be obtained and provided.
①
Commands
Computer
Wireless
unit
②
Responses
Command and response formats
(Host computer)
Command message *Only single-frame for data frame.
Header
Des-
tination
Text
Check
code
Termi-
nator
(To next command)
(Wireless unit)
Header
Source
Text
Check
code
Termi-
nator
Normal response message
Equipment
with MEWTOCOL
WTOCOL command
ME
RS232C
Computer
RS232C
DC
Power supply
Switch
Slave
Master
Flasher
Drive circuit
Slave
Equipment
with MEWTOCOL
Drive circuit
Slave (Repeater)
5-27
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Содержание KR20
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