Omron CRT1 - 10-2008, Operation Manual

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37
Communications Cable Section 2-3
2-3-3 Maximum Distance and Number of Connected Units for Types of
Communications Cables
The maximum lengths for each cable are shown below, along with the maxi-
mum number of Slave Units that can be connected. Do not exceed these lim-
its.
Baud Rate of 4 Mbps
(No Branching, See
note.)
Note Bit Slave Units come with Flat Cable and cannot be connected. The network
must consist of only Word Slave Units and multidrop connections. (Use
DCN4-MD4 Multidrop Connectors for Flat Cable.)
Baud Rate of 3 Mbps
Master Unit
Repeater
Unit
Trunk line length
Br
anch line length
Br
anch line length
Branch
line length
Branch
line length
Branch
line length
Branch line
length
Branch line length
Sub-tr
unk line length
Sub-tr
unk line length
Sub-tr
unk line length
Sub-tr
unk line length
Sub-tr
unk line length
Sub-tr
unk line length
Sub-branch
line length
Terminating
Resistor
Slave Units
Item Round cable I/II Flat Cable I/II
Length per trunk line or sub-trunk line
(maximum length with two Repeater Units) 30 m (90 m) 30 m (90 m)
Branch line length Lines cannot be branched from the
trunk line. (Only multidrop connections
are possible from the trunk line or sub-
trunk lines.)
Total branch line length
Restrictions on branch line locations
Number of Slave Units (including Repeater
Units) per trunk line or sub-trunk line 32 32
Item Round cable I/II Flat Cable I/II
Length per trunk line or sub-trunk line
(maximum length with two Repeater Units) 30 m (90 m) 30 m (90 m)
Branch line length 0.5 m 0.5 m
Total branch line length 8 m 8 m
Restrictions on branch line locations 3/m 3/m
Number of Units per branch (See note 1.) 1 1
Maximum sub-branch line length Not supported. Not supported.