133
Remote I/O Communications Characteristics
Section 7-1
First, the Network is divided into two groups: Master A and the slaves in
remote I/O communications with it, and Master B and the slaves in remote I/O
communications with it.
Note
Although in the above diagram the slaves are separated into two separate
groups for each master for convenience, the actual physical positions of the
slaves in the Network are irrelevant.
Next, refer to
7-1-2 CompoWay/F Communications Cycle Time and Refresh
Time
and calculate the communications cycle time for each group as if they
were separate Networks.
In Networks with two masters, the communications cycle time for the entire
Network will be the sum of the communications cycle times for both groups.
T
RM
= T
RM-A
+ T
RM-B
Although this example shows only two masters in the Network, the total com-
munications cycle time for any Network with more than one master can be cal-
culated by dividing it into groups performing remote I/O communications and
adding the communications cycle times of all the groups.
7-1-4
System Startup Time
This section describes the system startup time for a Network, assuming that
the scan list is enabled and that remote I/O communications are set to start
automatically at startup. The system startup time is the delay from the time
that the Master Unit is turned ON or restarted until the time remote I/O com-
munications begin.
The system startup time when the Master Unit is set to start up immediately
after power supplies of all the slaves' are turned ON is different from when the
Master Unit is restarted while communications are in progress. The startup
times are shown in the following table.
Slaves in remote I/O
communications with Master A
Master A
Master B
Group B
Group A
Slave a
Slave b
Slave c
Slaves in remote I/O
communications with Master B
Slave d
Slave e
Slave f
Communications cycle time for
Group A: T
RM-A
Master A
Master B
Group B
Group A
Slave a
Slave b
Slave c
Communications cycle time for
Group B: T
RM-B
Slave d
Slave e
Slave f
Condition
Slave's indicator status
System startup
time
The master is started
immediately after slave
startup.
NS indicator is OFF or flashing green. 11 s
Summary of Contents for EJ1 - 07-2008
Page 3: ...iv...
Page 19: ...xx...
Page 33: ...14 Initial Temperature Controller Settings Section 1 4...
Page 53: ...34 Wiring the Temperature Controllers Section 3 4...
Page 101: ...82 Ladder Programming Examples Section 4 6...
Page 143: ...124 Sending Explicit Messages Section 6 5...
Page 155: ...136 Message Communications Characteristics Section 7 2...
Page 163: ...144 Maintenance Section 8 2...
Page 189: ...170 Allocation Numbers for Configurators Manufactured by Other Companies Appendix B...
Page 197: ...178 Index...