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Remote I/O Communications Characteristics Section 8-1
T
IN
: The Input Slave’s ON (OFF) delay
T
OUT
: The Output Slave’s ON (OFF) delay
T
RM
:Network’s communications cycle time (See page 191.)
T
PC
:The PC’s cycle time (See note below.)
Note The PC’s cycle time will be delayed as shown below for one De-
viceNet Unit. For details, refer to Refresh Time on page 192.
0.7 ms + (number of occupied words × 0.001 ms)
The maximum I/O response time (T
MAX
) is the total of the following terms:
T
MAX
= T
IN
+ T
RM
× 2 + T
PC
× 3 + T
OUT
Communications Cycle
Time < PC Cycle Time
The maximum I/O response time will be as shown below if the DeviceNet Unit
takes in data immediately after I/O refreshing and if the communications cycle
time is shorter than the PC cycle time.
T
IN
: The Input Slave’s ON (OFF) delay
T
OUT
: The Output Slave’s ON (OFF) delay
T
RM
:Network’s communications cycle time (See page 191.)
T
PC
:The PC’s cycle time (See note below.)
Note The PC’s cycle time will be delayed as shown below for one De-
viceNet Unit. For details, refer to Refresh Time on page 192.
0.7 ms + (number of occupied words × 0.001 ms)
The maximum I/O response time (T
MAX
) is the total of the following terms:
T
MAX
= T
IN
+ T
RM
× 2 + T
PC
× 2 + T
OUT
Note 1. Refer to the CompoBus/D (DeviceNet) Slaves Operation Manual (W347)
for details on the Input and Output Slaves’ delay times.
2. Refer to Refresh Time on page 192 and to the PC’s Operation Manual for
details on the PC’s cycle time.
Communications cycle
Instruction
execution
Instruction
execution
PC
Transfers to the
shared RAM when
communications
cycle is completed.
Slave