FPΣ 7.2 Communication Cassette
7-9
2) The transmission speed (baud rate) and transmission format
are specified using the system registers.
3) Unit (Station) numbers are specified using the system
registers. Up to 31 units (stations) can be specified using the
switches on the control unit.
4) When connecting a commercially available device that has an
RS485 interface, please confirm operation using the actual
device. In some cases, the number of units (stations),
transmission distance, and transmission speed (baud rate)
vary depending on the connected device.
5) The values for the transmission distance, transmission speed
(baud rate), and number of units (stations) should be within
the values noted in the graph below.
Number
of units
(stations)
40
70
99
0 700 1000 1200
Transmission distance (m)
For transmission
speed 115.2k bits/s
For transmission
speed 57.6k bits/s
When using a transmission speed of 2,400 bits/s to 38.4k bits/s, you can set up to a
maximum of 99 units (stations) and a maximum transmission distance of 1,200 m.
PLC link function specifications
(
*
Note 1)
Item Specification
Communication method Token bus
Transmission method Floating master
Transmission line Twisted pair cable or VCTF
Transmission distance (Total length) 1,200 m/3,937 ft.
Transmission speed (Baud rate) 115.2 kbps
Number of units (stations) Max. 16 units (stations) (*Note 2)
PLC link capacity Link relay: 1,024 points, Link register: 128 words
Interface Conforming to RS485 (Connection using terminal block)
Notes
1) The RS485 type of communication cassette is necessary in
order to use the PLC link function.
2) Unit (Station) numbers are specified using the switches on the
control unit or the system registers.
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