5-1
Section
What Are Data Links?
67
Application Example of Using Offsets
In the following example, the send data from node 1 is split into three parts and
each part is received by a different node, i.e., each of the other nodes receives
only part of the send data from node 1. This enables effective use of data link
memory areas without wasting space. In this way, a type of message service
(i.e., specific data to a specific node) can be achieved through data links.
# 1
# 2
# 3
# 4
Send data of node 1
5-1-1 Data Link Specifications
Item
Description
No. of data link nodes
Optical Ring System: 62 nodes max. (2 nodes min.)
Wired System: 32 nodes max. (2 nodes min.)
Number of data link
words
Number of send/receive words per node (total of area 1 and area 2) :
CS1:
Up to 12,000
C200HX/HG/HE, CV:
Up to 8,000
Computer:
Manual setting
Optical Ring System: Up to 62,000
Wired System:
Up to 32,000
Automatic setting:
Up to 8,000
Number of send words per node
(total of area 1 and area 2): Up to 1,000
Allocation of data link
areas
Manual
setting
Area 1, 2: Bit area (IR, CIO, and LR Areas)
Data Memory (DM and EM Areas)
However, area 1 and area 2 cannot be set in the same memory area.
Automatic
setting
Area 1: IR, CIO, or LR Area
Area 2: Data Memory (DM and EM Areas)
Note When optical and optical ring connections are combined, the maximum number
of nodes is 32 and the maximum number of data link words for a computer for
manual settings is 32,000 words.
