307
Remote I/O Communications Characteristics
Section 7-1
The number of output bytes (B
OUT
) for Input Slaves is 0, and the number of
input bytes (B
IN
) for Output Slaves is 0.
Refresh Time
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.
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.
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.
7-1-3
More than One Master in Network
The following equation shows the remote I/O communications cycle time
(T
RM
) when there is more than one Master in the Network and message com-
munications are not being performed. An example for two Master Units is
used.
250 kbps
0.542 ms
0.073 ms
0.069 ms
125 kbps
1.014 ms
0.139 ms
0.135 ms
Baud rate
T
OH
T
BYTE-IN
T
BYTE-OUT
PLC
DeviceNet Unit I/O refreshing time (ms)
CS1H/G and C200HX/
HG/HE (-ZE)
1.72 + 0.022
×
the number of words refreshed
C200HS
2.27 + 0.077
×
the number of words refreshed
Additional processing time (ms)
1.72 + 0.022
×
the number of words refreshed
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Содержание CS1W-DRM21
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