25
Design and Operating Procedure Examples Section 1-6
Unit Number Unit number 5 is used.
Communications Mode
Number and Baud Rate
• Communications mode number: 3 (Mode 3 is selected because Word
Slave Units and Bit Slave Units are used.) Memory can be allocated in the
Special I/O Unit portion of the CIO Area, so a CX-Integrator setting is not
required.
• Baud rate: 3 Mbps (Branch lines are used, but not sub-branch lines. Also,
this baud rate can be used with a maximum trunk line length of 30 m.)
Communications Cycle
Time
The communications cycle time is 2.5 ms, at a baud rate of 3 Mbps in commu-
nications mode 3. Base calculations on a communications cycle time of 2.5
ms. (For details on I/O response times, refer to 5-3 Remote I/O Communica-
tions Performance.)
Note When less than the maximum number of nodes is used, the communications
cycle time is progressively shortened as the communications mode number
becomes smaller and as the baud rate is increased.
Registration Tables Registration tables are used.
• Registered Slave Unit Participation Standby Mode
Communications Error
Communications Stop
Mode
These are enabled.
Communica-
tions distance
4 Mbps Length of the trunk line or a sub-trunk line: 30 m max
3 Mbps Length of the trunk line or a sub-trunk line: 30 m max
1.5 Mbps Length of the
trunk line or a
sub-trunk line:
100 m max. when
there is no
branching, 30 m
max. when there
is branching
Length of the trunk line or a sub-trunk line: 30 m max
93.75 kbps Length of the
trunk line or a
sub-trunk line:
500 m max
Total wiring length: 200 m max
Item
Cable type
Round Cable I Round Cable II Flat Cable I Flat Cable II
Slave Unit type and maximum
number of nodes
Baud rate
Communications
mode No.
Communications cycle time (with message communications)
4 Mbps 3 Mbps 1.5 Mbps 93.75 kbps
Word Slave Units, max. 8 nodes
input and 8 nodes output
0 0.9 ms 0.9 ms 1.5 ms 19.8 ms
Word Slave Units, max. 16 nodes
input and 16 nodes output
1 1.0 ms 1.2 ms 2.3 ms 30.2 ms
Word Slave Units, max. 32 nodes
input and 32 nodes output
2 1.3 ms 1.7 ms 4.0 ms 51.3 ms
Word Slave Units, max. 16 nodes
input and 16 nodes output; Bit
Slave Units, max. 64 nodes input
and 64 nodes output
3 2.0 ms 2.5 ms
5.9 ms 72.1 ms
Word Slave Units, max. 64 nodes
input and 64 nodes output; Bit
Slave Units, max. 128 nodes
input and 128 nodes output
8 0.79 ms +
added time for
number of and
types of Slave
Units
0.85 ms +
added time for
number of and
types of Slave
Units
1.94 ms +
added time for
number of and
types of Slave
Units
24.81 ms +
added time for
number of and
types of Slave
Units
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