ICP DAS USA 7000 user manual RS-485 Networking

6.	7000 RS-485 Networking
6.1	Standard/Isolation Configuration
Standard Configuration.						￿7510, isolated 485/485 repeater
	R	￿7520, isolated 232/485 converter
Host		RS232		D+		RS485	D+
	T
				D-			D-
PC
	Gnd	RS485		￿RS-485		RS485	￿RS-485
PLC
	Is terminator
Max 2048			7xxx		￿7xxx		￿ 7xxx
				￿ 7xxx	￿~￿<=256		￿~￿<=2048
modules		in	one
RS-485 network

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

7000 Bus Converter User Manual (version 1.2,Feb/2003, 7PH-006-10) --------------- 73