Omron DRT1 Series - Page 320

304
Remote I/O Communications Characteristics Section 7-1
Minimum I/O Response Time
The minimum I/O response time occurs when the Slave’s I/O refreshing is
executed just after the input signal is received by the Master Unit and the out-
put signal is output at the beginning of the next I/O refresh cycle.
T
IN
: The Input Slave’s ON (OFF) delay (0 used as the minimum value)
T
OUT
: The Output Slave’s ON (OFF) delay (0 used as the minimum value)
T
RT-IN
: Input Slave’s communications time/Slave (See page 306.)
T
RT-OUT
: Output Slave’s communications time/Slave (See page 306.)
T
PLC
: The PLC’s cycle time
T
RF
: The PLC’s DeviceNet Unit refresh time (See page 307.)
The minimum I/O response time (T
MIN
) is the total of the following terms:
T
MIN
= T
IN
+ T
RT-IN
+ (T
PLC
– T
RF
) + T
RT-OUT
+ T
OUT
Note 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.
(T
PLC
-T
RF
)
Master Unit processing
Input
Output
Program execution
PLC
TPLC