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302
Remote I/O Communications Characteristics
Section 7-1
CV-series PLCs
(Synchronous Mode)
The following timing charts show the minimum and maximum I/O response
times of the DeviceNet Network for a CV-series PLC operating in synchro-
nous 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
T
OUT
:
The Output Slave’s ON (OFF) delay
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
PLC0
: The PLC’s cycle time (program exe peripheral servicing)
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
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. (See under
Synchro-
nous Operation
.)
T
RT - IN
+T
PLC0
Master Unit processing
Input
Output
Cycle time
Peripheral
servicing
Program
execution
Program
execution
Peripheral
servicing
Program
execution
PLC
T
PLC0
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