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FPΣ User's Manual
The status of the "reception done" flag may change while a scan is being carried out. For
example, if the flag is used more than once as an input condition, different statuses may exist
within one scan. To ensure proper execution of the program, the status of the special internal
relay should be copied to a variable at the beginning of the program.
Buffer statuses
The following shows the statuses of the send and receive buffers when the sample program is
run.
Status of the send buffer before sending:
Offset
0
2
1
16#53
(S)
16#25
At the end of transmission, the value in offset 0 is automatically reset to 0.
Status of the receive buffer when the reception is completed:
DT200
7
DT201
16#30
(0)
16#31
DT202
16#32
(2)
16#31
DT203
16#34
(4)
16#33
DT204
16#35 (5)
The number of bytes received is stored in offset 0. The received data is stored in order from
the low-order byte.
8.6.6.2 1:1 Communication with FP Series PLC
Connect the FPΣ and another FP series PLC using the RS232C interface and the
MEWTOCOL-COM communication protocol.
NOTE
MEWTOCOL-COM Master/Slave mode is recommended over program controlled
mode since programming is easier.
Communication mode:
Program controlled
FP series PLC
1:1 communication between the FPΣ (left) and another FP series PLC (right)
(%)
(1)
(1)
(3)
Data area read command
"%01#RDD00000 00001** C R "
Value of specified data register
8.6 Program Controlled Communication
FP series PLC
Communication mode:
MEWTOCOL-COM
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