445
Remote I/O Communications Characteristics Section 8-1
T
PLC2
: The PLC's peripheral servicing cycle time
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
MIN
) is the total of the following terms:
T
MIN
= T
IN
+ T
RT-IN
+ T
PLC2
+ T
RT-OUT
+ T
OUT
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 (Refer to page 451.)
T
PLC1
: The PLC's instruction execution cycle time
T
PLC2
: The PLC's peripheral servicing cycle time
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
MAX
) is the total of the following terms:
T
MAX
= T
IN
+ 2 × T
RM
+ T
PLC1
+ 2 × T
PLC2
+ T
OUT
TPLC2 TRM TOUTTIN TRM TPLC1 TPLC2
Instruction execution
cycle time
PLC cycle (instruction
execution cycle)
PLC cycle (peripheral
servicing cycle)
Master Unit processing
Input
Output
Peripheral
servicing
cycle time
Instruction
execution
Instruction
execution
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