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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
Содержание EJ1 - 07-2008
Страница 1: ...DeviceNet Communications Unit for EJ1 Temperature Controllers Cat No H155 E1 02 OPERATION MANUAL...
Страница 2: ...DeviceNet Communications Unit for EJ1 Temperature Controllers Operation Manual Revised July 2008...
Страница 3: ...iv...
Страница 19: ...xx...
Страница 33: ...14 Initial Temperature Controller Settings Section 1 4...
Страница 53: ...34 Wiring the Temperature Controllers Section 3 4...
Страница 101: ...82 Ladder Programming Examples Section 4 6...
Страница 143: ...124 Sending Explicit Messages Section 6 5...
Страница 155: ...136 Message Communications Characteristics Section 7 2...
Страница 163: ...144 Maintenance Section 8 2...
Страница 189: ...170 Allocation Numbers for Configurators Manufactured by Other Companies Appendix B...
Страница 197: ...178 Index...