Omron DRT2 SERIES DEVICENET SLAVES - OPERATION MANUAL 04-2008 User Manual

450
Remote I/O Communications Characteristics Section 8-1
T
RM
=Σ (communications time for each Slave)
+ MULTIPLE I/O TERMINAL processing time
+ Explicit message communications time
+ COS/Cyclic connection communications time [ms]
+ 0.01 × N + 1.0 [ms]
Communications time for each Slave:
Time required for each Slave. (Refer to pages 450 to 451.)
Σ (commu-
nications time for each Slave) is the total of the processing 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 message communications time:
0.11 × T
B
+ 0.6 [ms]
Added as delay time when explicit message communications (send or
receive) are used.
T
B
: Constant (500 kbps: T
B
= 2; 250 kbps: T
B
= 4; 125 kbps: T
B
= 8)
COS/Cyclic connection communications time:
(0.05 + 0.008 × S) × TB × n [ms]
Added as delay time when COS/Cyclic connection is used for com-
munications.
S: Total size (bytes) of the COS/Cyclic connection’s input size and
output size.
n: Number of nodes for which COS/Cyclic connections occur at the
same time during one communications cycle.
N: Number of Slaves
Communications
Time for each Slave
The communications time for each Slave is the time required for communica-
tions to be performed with a single Slave.
The following equations show the communications time per Slave (T
RT
) for
each kind of Slave Unit.
Output Slaves with up to 8
Bytes of Output
T
RT
= 0.016 × T
B
× S
OUT1
+ 0.11 × T
B
+ 0.07 [ms]
S
OUT1
: The number of Output Slave output words
T
B
: The baud rate (500 kbps: T
B
= 2; 250 kbps: T
B
= 4; 125 kbps: T
B
= 8)
Input Slaves with up to 8
Bytes of Input
T
RT
= 0.016 × T
B
× SOUT1 + 0.06 × T
B
+ 0.05 [ms]
S
IN1
: The number of Input Slave input words
T
B
: The baud rate (500 kbps: T
B
= 2; 250 kbps: T
B
= 4; 125 kbps: T
B
= 8)
Mixed I/O Slaves with up
to 8 Bytes of I/O
T
RT
= 0.016 × T
B
× (S
OUT2
+ S
IN2
) + 0.11 × T
B
+ 0.07 [ms]
S
OUT2
: The number of Mixed I/O Slave output words
S
IN2
: The number of Mixed I/O Slave input words
T
B
: The baud rate (500 kbps: T
B
= 2; 250 kbps: T
B
= 4; 125 kbps: T
B
= 8)

Omron DRT2 SERIES DEVICENET SLAVES - OPERATION MANUAL 04-2008 Specifications

General

Brand	Omron
Model	DRT2 SERIES DEVICENET SLAVES - OPERATION MANUAL 04-2008
Category	Network Hardware
Language	English