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7000 Bus Converter User Manual (version 1.2,Feb/2003, 7PH-006-10) --------------- 73
6. 7000 RS-485 Networking
6.1 Standard/Isolation Configuration
The Host PC/PLC will send out a command string from its RS-232
port. The 7520 will convert these RS-232 signals into a RS-485 signal
and isolate the host from RS-485 network.
The 7000 series modules, including D/I, D/O, A/D, D/A,
Timer/Counter and MMI modules, will be directly connected to RS-485.
These 7000 series modules can connect a max. Of 256 modules to the
RS-485 network without a repeater, the 7510. That it to say, there can
be 256 modules from 7xxx to 7xxx. If there are over 256 modules, the
repeater 7510 must be added to extend the RS-485 to RS-485. Then
there can be another 256 modules connected to the RS-485 network.
This is the first function of the 7510.
The module address can be changed from 00 to FF a total of 256
max. Therefore there are maxes. Of 256 modules in one RS-485 network
if all the modules communicate with the same speed.
(1) Because the 7000 can communicate with different baud rates in the
same RS-485 network, the 7xxx, 7xxx and 7xxx can be
communicated to HOST PC/PLC with a different baud rate.
(2) The 7000 series can be programmed to 1200, 2400, 4800, 9600,
19200, 38400, 57600, 115200,a total of 8 different speed.
(3) The 7000 modules can share the same module address if their baud
7520, isolated 232/485 converter
RS485
RS485
Standard Confi
g
uration.
7xxx
7xxx
~<=256
7xxx
~<=2048
Host
PC
PLC
RS232
RS485
Max 2048 7xxx
modules in one
RS-485 network
RS-485
RS-485
7510
,
isolated 485/485 re
p
eate
r
D+
D-
D+
D-
Is terminato
r
Gnd
T
R