Omron DRT2 SERIES DEVICENET SLAVES - OPERATION MANUAL 04-2008 Operation Manual page 466

Remote I/O Communications Characteristics
Maximum I/O Response
Time
PLC cycle (instruction
execution cycle)
PLC cycle (peripheral
servicing cycle)
Master Unit processing
Input
Output
T
IN
T : The PLC's peripheral servicing cycle time
PLC2
Note Refer to SECTION 5 General-purpose Slaves and SECTION 6 Environment-
resistive Slaves for details on Input and Output Slaves' ON and OFF delay
times. Refer to Refresh Time on page 451 and the Operation Manual for the
PLC being used for details on the PLC's peripheral servicing cycle time.
The minimum I/O response time (T
T = T + T
MIN IN RT-IN
The maximum I/O response time occurs with the I/O timing shown in the fol-
lowing diagram.
Instruction execution
cycle time
Instruction
execution
T T
RM PLC2
T : The Input Slave's ON (OFF) delay
IN
T : The Output Slave's ON (OFF) delay
OUT
T : The whole Network's communications cycle time (Refer to page 451.)
RM
T : The PLC's instruction execution cycle time
PLC1
T : The PLC's peripheral servicing cycle time
PLC2
Note Refer to SECTION 4 Functions of All Slaves, General-purpose Slaves, and
Environment-resistive Slaves, SECTION 5 General-purpose Slaves and SEC-
TION 6 Environment-resistive Slaves for details on Input and Output Slaves'
ON and OFF delay times. Refer to Refresh Time on page 451 and the Opera-
tion Manual for the PLC being used for details on the PLC's instruction execu-
tion and peripheral servicing cycle times.
The maximum I/O response time (T
T = T + 2 × T
MAX IN
) is the total of the following terms:
MIN
+ T + T + T
PLC2 RT-OUT OUT
Instruction
execution
Peripheral
servicing
cycle time
T T
PLC1 PLC2
) is the total of the following terms:
MAX
+ T + 2 × T
RM PLC1 PLC2
Section 8-1
T T
RM OUT
+ T
OUT
445