User Manual

7000 Bus Converter User’s Manual (Version 1.8 Jan/2006, 7PH-006-18) --------------- 66
6. 7000 RS-485 Networking
6.1 Standard/Isolation Configuration
Dais
y
-Chain Confi
g
uration.
The Host PC/PLC will send out a command string from its RS-232
port. The s7520 will convert these RS-232 signals into a RS-485 signal
and isolate the host from qRS-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 qRS-485.
These 7000 series modules can connect a max. Of 256 modules to the
qRS-485 network without a repeater, the 7510. That it to say, there can
be 256 modules from n7xxx to o7xxx. If there are over 256 modules, the
repeater 7510 must be added to extend the qRS-485 to rRS-485. Then
there can be another 256 modules connected to the rRS-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 n7xxx, o7xxx and p7xxx 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
rates are different. For example,
n7xxx=module address 01, baud rate=1200