14
2
Installation & Connection
14
In
sta
llation
&
Conn
ectio
n
Chapter
2
2-5.
Connection of RS-485
(RS-485 or SI/F standard: not specified at the time of order)
RS-485 is an interface to read the indicated
values and status of the F325 and to write the
setting values into the F325. This interface is
convenient for processing such as controls, totals,
and records by connecting the F325 to a PLC,
programmable display unit and so forth.
Two-wire (point to point)
- Use twisted pair wires for connection cables. (Noise margin increases.) However, two-core
parallel cables are sufficient for short-distance connection.
- Install the included terminator to the F325 if the F325 is a dead end.
- SG terminal (B10 terminal) is a ground terminal (which protects a circuit) used on the circuit.
SG terminal is not normally required to use if the main unit of the F325 and connection
counterpart device are class D grounded.
However, in case connection is necessary based on the on-site conditions, check the
specifications of the counterpart device and connect it.
Two-wire (multi point)
B8
B9
B10
RS-485 terminal
B+
A-
SG
Signal ground terminal
A-
B+
A
B
A
B
A-
B+
F325
PLC
・
programmable display unit and so on
Terminator
(Master)
(Slave)
* Logic
・
Mark state (OFF)
V
A
-
V
B
<-
0.2V
・
Space state (ON)
V
A
-
V
B
>
0.2V
V
A
A- terminal voltage
V
B
B+ terminal voltage
Terminator
(accessory)
Depending on master devices, A and B may be reversely indicated.
In case communication is not possible, switch A and B.
Attention
A
B
A- B+
A- B+
A- B+
A- B+
Twisted pair wire
F325
F325
F325
F325
Terminator
Terminator
Содержание F325
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