Omron DeviceNet CV Series Operation Manual page 324

Remote I/O Communications Characteristics
Refresh Time
7-1-3 More than One Master in Network
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Baud rate
250 kbps
125 kbps
The number of output bytes (B
input bytes (B ) for Output Slaves is 0.
IN
The refresh time is the time required for I/O data to be exchanged between
the PLC's CPU Unit and the DeviceNet Master Unit. The PLC's cycle time is
increased when a Master Unit is mounted, as shown below.
Note Refer to the PLC's Operation Manual for more details on the refresh time and
the PLC's cycle time.
Master Unit for CV-series PLCs (CVM1-DRM21)
The PLC's cycle time is increased by 1.1 ms. This is the extra time required
for CPU Bus Unit servicing (DeviceNet Master Unit refreshing).
Master Unit for CS1H/G, C200HX/HG/HE (-ZE), and C200HS PLCs
(C200HW-DRM21)
The PLC's cycle time is increased by the amount shown below. The extra time
is required for I/O refreshing.
PLC
CS1H/G and C200HX/
HG/HE (-ZE)
C200HS
The number of words refreshed is the total number of words in the I/O Area
that are used by the Slaves, including any unused words between words actu-
ally used by the Slaves. For example, if there are only two Input Slaves with
node addresses 1 and 5, the 5 input words for nodes 1 through 5 would be
refreshed even though the input words for nodes 2, 3, and 4 are unused.
If message communications are being performed, just add the number of
words used in message communications to the above number of words for
whenever messages are being processed.
C200H I/O Link Unit
The PLC's cycle time is increased by the amount shown below when a C200H
I/O Link Unit is mounted to the PLC. The extra time is required for I/O refresh-
ing.
Additional processing time (ms)
1.72 + 0.022 × the number of words refreshed
The number of words refreshed is the total number of words allocated to the
Read/Write Area.
If message communications are being performed, just add the number of
words used in message communications to the above number of words for
whenever messages are being processed.
The following equation shows the remote I/O communications cycle time
(T ) when there is more than one Master in the Network and message com-
RM
munications are not being performed. An example for two Master Units is
used.
T T
OH BYTE-IN
0.542 ms 0.073 ms
1.014 ms 0.139 ms
) for Input Slaves is 0, and the number of
OUT
DeviceNet Unit I/O refreshing time (ms)
1.72 + 0.022 × the number of words refreshed
2.27 + 0.077 × the number of words refreshed
Section 7-1
T
BYTE-OUT
0.069 ms
0.135 ms
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