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IP address using DHCP with Modbus or BACnet over IP

Issue

IP address using DHCP

Environment

IP network

Cause

Bacnet or Modbus IP loses communication

Resolution

The AS or ES may be configured using DHCP (Dynamic Host Configuration Protocol), this is usually set up using "Device Manager" See Lessons Learned Article #11216.

However many other systems use fixed IP address and use the IP address to specify the controller or server.

Thus it is usually best to use fixed IP addresses for the Automation Server and Enterprise Server, especially if using Bacnet or Modbus over IP

NOTE
When the IP address of an AS is manually changed, the IP address of the Bacnet or Modbus IP interface needs also to be manually changed

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