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131
Remote I/O Communications Characteristics
Section 7-1
Maximum I/O Response
Time
The maximum I/O response time occurs with the I/O timing shown in the fol-
lowing diagram.
T
IN
:
The Input Slave's ON (OFF) delay
T
OUT
:
The Output Slave's ON (OFF) delay
T
RM
:
The whole Network's communications cycle time
T
PLC
:
The PLC's cycle time
T
RF
:
The PLC's DeviceNet Unit refresh time
Note
Refer to the information on each slave for details on Input and Output Slaves'
ON and OFF delay times. Refer to
7-1-2 CompoWay/F Communications
Cycle Time and Refresh Time
and the Operation Manual for the PLC being
used for details on the PLC's cycle time.
The maximum I/O response time (T
MAX
) is the total of the following terms:
T
MAX
= T
IN
+ 2 × T
RM
+ 2 × T
PLC
+ T
RF
+ T
OUT
7-1-2
CompoWay/F Communications Cycle Time and Refresh Time
This section explains the communications cycle time and refresh processing
time required to calculate various processing times for DeviceNet.
Communications
Cycle Time
The communications cycle time is the time from the completion of a slave's
I/O communications processing until I/O communications with the same slave
are processed again. The communications cycle time of the DeviceNet Com-
munications Unit is the maximum CompoWay/F communications cycle time
T
IN
+ T
OUT
.
Reference values for CompoWay/F communications cycle time are given
below.
Communications Cycle
Time Reference Values
Total communications cycle time = IN communications cycle time + OUT com-
munications cycle time.
PLC
T
PLC
T
OUT
T
IN
T
RM
T
RF
T
PLC
T
RM
Master Unit
Input
Output
Instruction
execution
Instruction
execution
Instruction
execution
No. of Temperature
Controllers
TIN
TOUT
1
100 ms
100 ms
8
400 ms
700 ms
16
900 ms
1,200 ms
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...