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VC-8000 MPS
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9.7.3 Time Synchronization via NTP (via SAM DCS port)
The VC-8000 rack can synchronize its time with a master clock using an NTP server. This connection
uses the DCS NET (Modbus TCP) port. To use an NTP server, change the Time Source setting to
“NTP (via DCS Port)”. Then enter the IP Address for the NTP server. The rack will now send NTP
requests to the specified IP address.
Although the DCS NET port is dual function (Modbus and NTP); the port only has one IP address. If
both Modbus TCP, and NTP are being used, both “functions” are using the same IP address. For
example, in Figure 9-18 the Modbus address of Rack 1 is 192.168.0.51, so the NTP address of Rack
1 must also be 192.168.0.51.
Normally, NTP should not be used if you are connected to a CMS system.
Figure 9-18) Modbus TCP Architecture with NTP Server
9.7.4 Set Rack Time with Rack Maintenance Software
If there is no external system for time synchronization, you can set the
rack time using your laptop and the Rack Maintenance software.
This is a single (one-time) push from your laptop to the rack.
Note: To use this feature, the Time Source (in SAM configuration)
must be set to CMS (DAQ).
Figure 9-19) Set Rack Time
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