1.
2.
-
-
-
In the scenario shown, the PLC has the master function and uses cyclic communication with the devices. Therefore, not all function-
alities of the VLT
®
Servo Toolbox, for example the drive control, can be used.
The restrictions when using indirect communication are detailed in the
VLT® Servo Drive System ISD 510, DSD 510, MSD 510 (VLT®
Flexmotion
™
) Programming Guide
.
e30be309.11
A
2
n
1
B
PLC
. . .
PSM
510
DAM
510
DAM
510
STATUS PSM
LINK/ACT
DEV
STO
NET ST
X1
LCP
LCP
LCP
X2
STATUS DAM
LINK/ACT
DEV
STO
NET ST
AUX
X1
X2
X3
STATUS DAM
LINK/ACT
DEV
STO
NET ST
AUX
X1
X2
X3
Illustration 47: Logical View of Indirect Ethernet-based Fieldbus Communicaton (Communication via PLC)
A
Fieldbus
B
VLT
®
Servo Toolbox host system
N O T I C E
The logical view only shows the connectivity from a high-level software perspective and does not reflect the actual physical
topology of the network.
6.6.4.3.2 Network Settings for Indirect Communication
Any network interface can be used to communicate through a PLC. A dedicated network interface is not required.
When establishing the communication through a PLC, the VLT
®
Servo Toolbox configures a routing table using the selected Net-
work Address Translation (NAT). Adding a route to the Windows routing table requires administrator privileges. Therefore, adminis-
trator credentials may be requested when initializing the connection.
6.6.4.3.3 Enabling Indirect Communication
Carry out the following steps to enable indirect communication.
N O T I C E
When observing the network packets via Wireshark
®
, checksum offloading often causes confusion as the network packets to be
transmitted are handed over to Wireshark
®
before the checksums have been calculated. Wireshark
®
shows these empty check-
sums as invalid, even though the packets contain valid checksums when they leave the network hardware later. Use 1 of these 2
methods to avoid this checksum offloading problem:
Turn off the checksum offloading in the network driver if possible.
Turn off the checksum validation of the specific protocol in the Wireshark
®
preferences.
Disable IPv6 on the network interfaces used for communication on the PC:
Procedure
Open the
Network and Sharing Center
.
Select
Change adapter settings
.
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Danfoss A/S © 2023.08
Commissioning
VLT® Servo Drive System ISD 511
Operating Guide
Содержание VLT ISD 511
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