Terms - Panasonic FP7 CPU Unit User Manual

Communication Functions of CPU Unit

1.4 Terms

The following terms are used for settings on the software for connecting the FP7 CPU unit to
Ethernet LAN, and in the Users Manuals.
 Server connection and client connection
• These indicate methods for connecting a virtual communication line between FP7 and an
external device.
• "Server connection" refers to a method to wait for connection from another client.
• "Client connection" refers to a method to connect a virtual communication line from the FP7
CPU unit to another external device port. Even if connection fails, repeated connection
attempts are made at a specified interval.
 Master communication and slave communication
• These indicate methods for actually sending/receiving messages and data between FP7 and
an external device.
• In master communication, PLC sends commands and receives responses.
• In slave communication, commands are received from an external device, and responses
are returned.
• In a system using FP7, whether server connection or client connection is selected, once
connection is opened and a virtual communication line is connected, commands and
responses can be sent and received from both sides.
Virtual line connection
from external device
FP7 CPU
(server
Ethernet
connection)
IP XXXXXX
Command
Master
communication
Slave
Response
communication
1-10
External device
(client connection)
LAN
IP XXXXXX
Response
Command
Virtual line connection
from FP7 CPU
FP7 CPU
(client connection)
Ethernet
LAN
IP XXXXXX
Command
Master
communication
Slave
Response
communication
External device
(server
connection)
IP XXXXXX
Response
Command