User`s manual

FX communication
Computer link 7
7-9
7
2 ) Station number
The station number is the number provided at the programmable controller in order to
determine which programmable controller the computer accesses. In the FX series
programmable controller, the station number is set by the special data register D8121(special
D8121 hereinafter). The setting range is 00H to 0FH. In the case of FX
0N
series turn on
M8120 when using the special D8121. For the setting method of an A series programmable
controller, see the A series manual.
The following instructions can be used to set the station number of station 0 in the above system.
↑
485ADP
Station No.15
Computer
FX
series
FX
series
FX
series
FX
series
485PC-IF
↑
485ADP
Station No.0
↑
485ADP
Station No.1
↑
485ADP
Station No.2
M8002
FNC 12
MOV
H0
D8121
Notes
1 ) When setting station numbers, don't set the same number at more than 1 station.
Otherwise, transmission data may become confused and communication irregular.
2 ) Station numbers need not be set in numerical order, but are free to be set within the
specified range(00H to 0FH). For example, setting in a random order or skipping numbers
is acceptable.
3 )PLC number
The PLC number is the number identifying the programmable controller CPU on the A
series MELSECNET(
II
) or MELSECNET/B.
Accordingly, the PLC number for an FX series programmable controller is FF
H
, and is
represented as two ASCII characters; i.e. ”FF”. When using the on-demand function the
PLC number is automatically converted to FF
H
by the programmable controller.
For the PLC number of programmable controller CPU on the MELSECNET(
II
),
MELSECNET/B see the computer link manual for A series programmable controllers.
4 )Command
Used to specify the operation required, e.g. read, write, etc. Commands are defined using
two ASCII characters.
For a description of the available commands, see section 7.7.1.