Duplicate IP Address Prevents Machine Startup
|Event Year:||1996||Reliability:||Likely But Unconfirmed|
|Industry Type:||Pulp and Paper|
The mill had upgraded the profile controller on the #1 Paper Machine to a control system that used Ethernet and TCP/IP to communicate between the scanners and the main controller. It was also connected to the main mill network through a bridge so that profile information could be accessed by business applications. Some time after the installation, a network printer in another area of the mill was accidentally given the same IP address as the controller. Initially this did not cause difficulties, but shortly after a routine maintenance shutdown, the scanners started directing their data to the printer rather than to the controller.
The paper machine could not be started for over six hours.
|Action Description:||Installed VLANs and seperate subnets between business and process networks|