Omron DeviceNet CV Series Operation Manual page 318

Remote I/O Communications Characteristics
Note
PLC cycle
(instruction execution cycle)
PLC cycle
(peripheral servicing cycle)
Master Unit processing
Input
Output
Note
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T : Output Slave's communications time/Slave (See page 306.)
RT-OUT
T :The PLC's peripheral servicing cycle time
PLC2
The minimum I/O response time (T
T = T + T + T
MIN IN RT-IN
1. Refer to SECTION 4 General-purpose Slaves, SECTION 5 Environment-
resistive and Waterproof Slaves, and SECTION 6 Special I/O Slave Units
Specifications for details on Input and Output Slaves' delay times.
2. Refer to Refresh Time on page 307 and the PLC's Operation Manual for
details on the PLC's peripheral servicing cycle time.
Maximum I/O Response Time
The maximum I/O response time occurs with the I/O timing shown in the fol-
lowing diagram.
Instruction execution
cycle time
Instruction
Instruction execution
execution
T T
PLC2 PLC1
T : The Input Slave's ON (OFF) delay
IN
T : The Output Slave's ON (OFF) delay
OUT
T : Master Unit's communications cycle time (See page 305.)
RM
T : The PLC's instruction execution cycle time
PLC1
T : The PLC's peripheral servicing cycle time
PLC2
The maximum I/O response time (T
+ 2 × T
T = T
MAX IN RM
1. Refer to SECTION 4 General-purpose Slaves, SECTION 5 Environment-
resistive and Waterproof Slaves, and SECTION 6 Special I/O Slave Units
Specifications for details on Input and Output Slaves' delay times.
2. Refer to Refresh Time on page 307 and the PLC's Operation Manual for
details on the PLC's peripheral servicing cycle time. (Look under Asyn-
chronous Operation.)
) is the total of the following terms:
MIN
+ T + T
PLC2 RT-OUT OUT
Peripheral
servicing
cycle time
T
PLC2
) is the total of the following terms:
MAX
+ 2 × T
+ T + T
PLC1 PLC2 OUT
Section 7-1
301