446
Remote I/O Communications Characteristics Section 8-1
CVM1- and CV-series PLCs (Synchronous Mode)
Minimum I/O Response
Time
The minimum 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 (Minimum value: 0)
T
OUT
: The Output Slave's ON (OFF) delay (Minimum value: 0)
T
RT-IN
: The Input Slave's communications time/Slave (Refer to page 450.)
T
RT-OUT
: The Output Slave's communications time/Slave (Refer to
page 450.)
T
PLC0
: The PLC's cycle time (instruction execution + peripheral servicing)
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 cycle time.
The minimum I/O response time (T
MIN
) is the total of the following terms:
T
MIN
= T
IN
+ T
RT-IN
+ 2 × T
PLC0
+ T
RT-OUT
+ T
OUT
PLC
TPLC0 TRT-OUT TOUTTIN TRT-IN+TPLC0
Cycle time
Master Unit
Input
Output
Periph-
eral ser-
vicing
Instruction
execution
Instruction
execution
Periph-
eral ser-
vicing
Periph-
eral ser-
vicing
Instruction
execution
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