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FP2−CCU
Functions of Computer Communication Unit
1 − 4
1.2 Unit Operation
1.2 Unit Operation
1.2.1 Operation Overview
The Computer Communication Unit reads and writes data and contacts of the CPU unit
by the host computer, through an RS232C interface.
When a command is sent from a host side, a response is returned from the PLC side.
The formats of commands and responses are determined by the MEWTOCOL, which
is the communication protocol for the FP series of PLCs.
Programs for host side devices such as computers and display panels are created in
accordance with the protocol “MEWTOCOL”.
More than 20 types of commands are available, including commands for reading and
writing the data area and contacts, etc.
No program is necessary on the PLC side in order to carry out communication.
Example:
When the contents of the data registers are read to a host
computer:
5
1
5
3
AM
¦
L
Display panel
Computer
Response
Command
10
3
5
DT2
DT1
DT0
%01#RDD0000000001**
C
R
%01$RD05000A0062
C
R
RS232C
The display panel for the FP series was designed ahead of time in confor-
mance with the MEWTOCOL communication protocol, so there is no need
to take the contents of commands into consideration.
Tip