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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
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 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 115.)
RM
T
: The PLC's instruction execution cycle time
PLC1
T
: The PLC's peripheral servicing cycle time
PLC2
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 peripheral servicing cycle time.
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 7-1
T
T
RM
OUT
+ T
OUT
111
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