Omron E5ZN-DRT, Operation Manual

Page: 130 / 162

115
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
The communications cycle time, communications time for each slave, and
refresh time are explained in this section. All of these times are necessary for
calculating the time required for various processes in a DeviceNet Network.
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
.
The equations used to calculate the CompoWay/F communications cycle time
are described here.
Communications Cycle
Time Equations Total communications cycle time = IN communications cycle time + OUT com-
munications cycle time.
■
IN Communications Cycle Time
IN communications cycle time = (18 ms ×
Σ α
) + (6 ms × total allocated words
in IN Area 1 and 2)
α
indicates the number of commands for a single Temperature Controller.
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