Operation Outline For Mewtocol-Com Slave - Panasonic FPS Series User Manual

FPΣ User's Manual

8.5.1 Operation Outline for MEWTOCOL-COM Slave

Instructions issued by the computer to the PLC are called commands. Messages sent back to
the computer from the PLC are called responses. When the PLC receives a command, it
processes the command regardless of the sequence program, and sends a response back to
the computer. Communication is carried out in a conversational format, based on the
MEWTOCOL-COM communication procedures. Data is sent in ASCII format. The computer
has the first right of transmission. The right of transmission shifts back and forth between the
computer and the PLC each time a message is sent.
Transmission program
Command message
Start Text
Destina-
1 2 3
code
tion
1
The station number of
the PLC to which the
command is being sent
2
The type of command
3
Any settings and data
required in order to
execute the command
The command and data
are sent to the PLC with
the specified station
number
MEWTOCOL-COM communication between the FPΣ and a computer
Computer
Check End
code code
8.5 MEWTOCOL-COM
Reception processing program
4
The station number of
the PLC that sent the
response
5
Confirmation of whether
or not the processing was
carried out successfully
6
The type of command
processed
7
If the command was
used to read data, the
data that was read
8
If an error occurred and
the command could not
be processed success-
fully, the content of the
error
A response is returned and
processed by the computer
(e.g. the computer retrieves
the data that was sent.)
Response message
Start Source Text
4 5 67 8
code
Check End
code code
173