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What Are Data Links? Section 5-1
Note The following table shows the status of the data link refresh area when a node
registered in the data link table generates a communications error.
5-1-1 Data Link Specifications
# 1 # 2 # 3 # 4
Send data of node 1
Communications error type Data link area
A node separates from the network while
a data link is running.
Data received immediately prior to the
error continues to be refreshed in the
data link areas of the relevant nodes.
A node does not join the network after the
data links start.
Zero (0) data continues to be refreshed in
the data link areas of the relevant nodes.
Item Description
No. of data link
nodes
32 max., 2 min.
Number of data
link words
Number of send/receive words per node (total of area 1 and
area 2):
CS/CJ Series: 12,000 max. (pre-Ver. 1.2)
20,000 max. (unit Ver. 1.2 or later)
C200HX/HG/HE, CVM1, CV, CQM1H:
Up to 8,000
IBM PC/AT or compatible: Manual setting: 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-access area (IR, CIO, and LR
Areas)
DM Area (DM and EM Areas)
Unit Ver. 1.2 or later: Area 1 and Area 2 can be
set in the same memory area.
Pre-Ver. 1.2: Area 1 and Area 2 cannot be set
in the same memory area.
Automatic set-
ting equality
layout
Area 1: IR, CIO, or LR Area
Area 2: DM Area (DM and EM Areas)
Automatic set-
ting
1:N allocations
Area 1, 2: Bit-access area (IR, CIO, and LR
Areas)
DM Area (DM and EM Areas)