77
12
Interface
77
Interface
Chapter
12
■
Connection of RS-485
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 circuits) 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)
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 that 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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Страница 154: ...143 15 Specifications 143 Specifications Chapter 15 When DAV DAI option is selected Unit mm When DAI option is selected...
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