Omron CQM1H-CLK21 - Manual (Page 31)

8
Overview Section 1-1
1-1-2 Features
The Controller Link Network has the following features to meet the various
requirements of FA sites.
Data Links
Flexible and efficient data links can be created for large capacities of data as
listed below.
Data links can be automatically set, or they can be set by the user to freely
change the sizes of the data areas used. A data link can also be created so
that one node receives only part of the data sent from another node. This
function enables users to receive only the required data, thereby increasing
data link efficiency.
Data link tables for which the number of send and receive words exceeds
12,000 words can be set using CX-Net in CX-Programmer Ver. 5.0 or higher.
Message Service
The message service can send and receive up to 2,012 bytes of data (includ-
ing the FINS header), allowing high volumes of data to be sent and received
without having to split it up.
Twisted-pair Cable or Optical Fiber Cable Connection
The Controller Link Units can be connected to the network using either
shielded twisted-pair cables or optical fiber cables. Select the system that
suits your application.
Features of Twisted-pair Cable
Twisted-pair cable is easy to connect and maintain. The cable can be pro-
cessed much more easily than coaxial or optical cable, thereby reducing the
cost of tools and assembly time.
Connections are made to a terminal block on the Controller Link Unit and to a
special connector on the Controller Link Support Board for easy system
assembly and modification.
The network is equipped with the required terminating resistance built into the
Units allowing the terminating resistance to be easily set at both ends of the
network using a simple switch.
Features of Optical Fiber Cable
Optical Fiber Cable has superior noise resistance, so this system can provide
highly reliable communications even in very noisy conditions.
The communications distance can be up to 20 km total (1 km max. between
nodes) if H-PCF cable is used and up to 30 km total (2 km max. between
nodes) if GI cable is used, which allows long-distance or large-scale net-
works.
Once the Optical Fiber Cable has been fitted with special connectors, the
cables can be easily connected or disconnected.
Item Specifications
Number of send words
per node 1,000 max.
Number of send and
receive words per node C200HX/HE/HG, CVM1, CV-series, and CQM1H-series PLCs: 8,000 max.
CS/CJ-series PLCs:
Pre-Ver. 1.2: 12,000 words max.
Unit Ver. 1.2 or later: 20,000 words max.
IBM PC/AT or compatible: 32,000 max. (PCI or ISA Board)