Omron DeviceNet CV Series Operation Manual page 323

Remote I/O Communications Characteristics
Communications Time for
each Slave
306
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= Σ (Communications time for each Slave)
T
RM
+ MULTIPLE I/O TERMINAL processing time
+ Explicit messages processing time
+ 0.01 × N + 1.0 [ms]
Communications time for each Slave: Time required for each Slave
Σ (Communications time for each Slave) is the total of the processing time
of each Slave in the network.
MULTIPLE I/O TERMINAL processing time:
3.5 [ms]
Only when Slaves with input, output, or mixed I/O of more than 8
bytes exist.
Explicit messages processing time:
0.11 × T
+ 0.6 [ms]
B
Explicit message communications execution time
T : Baud rate factor
B
(500 kbps: T
N: Number of Slaves
The following equations show the communications time per Slave (T
each kind of Slave Unit.
Output Slaves with 8 Bytes of Output Max.
= 0.016 × T × S
T
RT B OUT1
S : The number of Output Slave output words
OUT1
T : The baud rate
B
(500 kbps: T
B
Input Slaves with 8 Bytes of Input Max.
= 0.016 × T × S + 0.06 × T
T
RT B IN1
S : The number of Input Slave input words
IN1
T : The baud rate
B
(500 kbps: T
B
Mixed I/O Slaves with 8 Bytes of I/O Max.
= 0.016 × T × (S
T
RT B OUT2
S : The number of Mixed I/O Slave output words
OUT2
S : The number of Mixed I/O Slave input words
IN2
T : The baud rate
B
(500 kbps: T
B
Input Slaves, Output Slaves, or Mixed I/O Slaves with Over 8 Bytes of I/O
× B
T = T + T
RT OH BYTE-IN IN
T : The protocol overhead
OH
T : The input byte transmission time
BYTE-IN
B : The number of input bytes
IN
T : The output byte transmission time
BYTE-OUT
B : The number of output bytes
OUT
Baud rate
500 kbps 0.306 ms
= 2; 250 kbps: T
B B
+ 0.11 × T
+ 0.07 [ms]
B
= 2; 250 kbps: T = 4; 125 kbps: T
B
+ 0.05 [ms]
B
= 2; 250 kbps: T = 4; 125 kbps: T
B
) + 0.11 × T
+ S + 0.07 [ms]
IN2 B
= 2; 250 kbps: T = 4; 125 kbps: T
B
× B
+ T [ms]
BYTE-OUT OUT
T T
OH BYTE-IN
0.040 ms
Section 7-1
= 4; 125 kbps: T = 8)
B
) for
RT
= 8)
B
= 8)
B
= 8)
B
T
BYTE-OUT
0.036 ms