1-1
Section
Introduction
9
1-1-3 Configuration Patterns for CompoBus/D Networks
The following network patterns can be constructed, depending on the number of
Masters being used.
Number of
Masters
One Master connected to one
network
Two Masters connected to one
network
Two Masters connected to one
PC
Configuration
Master
Slaves
Master
Master
Slaves
Masters
Slaves
Slaves
Configurator
Not required when fixed I/O
allocation is used.
Required
Remote I/O
Communications
Fixed
allocation
Yes
No
No
Free
allocation
1
Yes
Yes
A
B
Yes
A
B
B
A
Features
•
Same as earlier networks
•
The communication cycle time
will be longer.
(See note 2.)
•
The PC’s communication
cycle time will be longer.
Precautions
•
Same as earlier networks
•
See the precautions described
on page 87.
•
Two Masters can’t control the
same Slave.
•
A Bus Off error may occur due
to a communications conflict if
there are two Masters set to
“scan list disabled mode” in the
network.
•
Be sure that the PC data
areas allocated to the Masters
do not overlap.
Note
1. The CompoBus/D Configurator is needed to allocate I/O.
2. When the Masters (A and B) form separate networks with communication
cycle times of T
A
and T
B
, the total communication cycle time for the network
shown in the diagram is T
A
+ T
B
.
3. When mounting two or more Master Units in a network or in a PC, do not mix
a newer CompoBus/D Master that has the “-V1” suffix with an older Compo-
Bus/D Master that doesn’t have the “-V1” suffix.