LAB-EL LB-760, Руководство по установке

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LB-762 Controller Installation Manual LAB-EL
3.10.1 Configuration example
When using Ethernet network for controllers and PC connection, it’s necessary to properly configure IP addresses. Below
is a sample configuration, assuming usage of private IP address range. It’s typical configuration for standalone system,
when there’s no need for routing between regulators and control software via other networks. Figure
1.3 presents connection
diagram for such simple system. 192.168.100.0 network address will be used, preventing conflicts with most popular 192.168.1.0
network, if one is already in use. Static addresses will be assigned to network nodes - autoconfiguration with BOOTP/DHCP
protocols is not used.
• regulators #1..99: addresses 192.168.100.1 .. 192.168.100.99
• komputer PC: 192.168.100.100
• optionally additional router (ex. to Internet): 192.168.100.254
Subnet mask: for all network nodes it’s the same: 255.255.255.0
Default gateway: if router is present in the network, its address should be used (192.168.100.254), otherwise gateway address
doesn’t matter - regulators can be set with 0.0.0.0 address, or PC address (192.168.100.100).
Proper settings (IP address, subnet mask, gateway) should be set for every network node (regulators, PC, router) - but every
device gets it’s own unique IP address. Subnet mask and gateway address are the same for all nodes.
Regulator address settings can be applied using lbnetcfg tool, PC with Windows operating system requires changes to network
card settings, under TCP/IP protocol properties.
3.11 RS-485 network
The connector described as
RS-485
is used to connect LB-762 regulator to RS-485 network, serving for communication with
an appropriate IT system (PC computer and appropriate software).
For connection of RS-485 network 3 contacts are provided:
• A - signal,
• B - signal,
• GND - ground.
RS-485 bus is galvanically insulated from all other signals.
In order to obtain as high immunity to interference as possible, for RS-485 network connection use two-pair screened spiral,
with minimal wire section 0.2 mm
2
. One pair of wires should be connected to contacts A and B, the second pair together
with the screen connected to contact GND.
Total length of RS-485 network may be max. 1200 meters.
Figure 3.13 presents the manner of RS-485 network connection. The Connecting cable must be laid from one device to the
next one, branching must be directly on connecting clamps – on the diagram points marked with dots.
Numbers of contacts described for RS-485 connector of LB-480 module relate to plug type DB9M, which should be used for
connecting LB-480 module.
Figure 3.14 presents two examples of RS-485 network topologies. A properly laid network conducts in one cable from one
device to the other device. Incorrectly laid network has branching of cable – such placement of network is unacceptable!
Rysunek 3.13: Scheme of RS-485 network connection
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