303
Remote I/O Communications Characteristics
Section 7-1
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
:
Master Unit’s communications cycle time (See page 305.)
T
PLC0
: The PLC’s cycle time (program exe peripheral servicing)
The maximum I/O response time (T
MAX
) is the total of the following terms:
T
MAX
= T
IN
+ 2
×
T
RM
+ 3
×
T
PLC0
+ 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
.)
CS1H/G, C200HS, and
C200HX/HG/HE (-ZE) PLCs
The following timing charts show the minimum and maximum I/O response
times of the DeviceNet Network with a CS1H/G, C200HX/HG/HE(-ZE), or
C200HS PLC.
T
RM
+T
PLC0
Master Unit processing
Input
Output
Cycle time
Program
execution
Peripheral
servicing
Program
execution
Peripheral
servicing
Program
execution
Program
execution
PLC
T
PLC0
T
PLC0
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