Before using the DAS for AB INTERCHANGE software, you must perform the following postinstallation tasks:

• Set TCP/IP for OpenVMS UCX parameters (for EI Network Interface option only).
• Edit the configuration file
• Set the BASEstar Classic port quota parameter
• Set the device connection management SPT (support) block parameter
• Set the DAS-specific BASEstar Classic parameters
• Set the DTL server process quotas
• Set up plant-floor equipment

The Allen-Bradley INTERCHANGE Software for OpenVMS uses TCP/IP services for OpenVMS (UCX) to communicate to the Ethernet interface. By default, UCX waits 10 minutes before notifying a TCP/IP application that a connection has been broken or that a connection to an unavailable interface has failed. This default timeout characteristic may not be appropriate for your use with the DAS for AB INTERCHANGE software. To override this behavior, the following must be done.

In the system start up file SYS$MANAGER:SYSTARTUP_V5.COM, after SYS$STARTUP:UCX$STARTUP.COM, but before SYS$STARTUP:DTLNET_STARTUP.COM is invoked add the following two lines:

$UCX SET PROTOCOL TCP/PROBETIME=pt $UCX SET PROTOCOL TCP/DROPTIME=dt

Where:

pt = number of seconds between sending keepalive probe messages. Default value is 75 seconds. Allen-Bradley recommended value is 10 seconds.
dt = number of seconds to wait since the last successful probe message before dropping the connection. The default value for dt is 600 seconds (10 minutes). The recommended value is 80 seconds. Note, the rule for setting dt is dt => 8 x pt .

Consult the appropriate TCP/IP Services for OpenVMS and Allen-Bradley documentation for more detailed information on configuring the TCP/IP network for INTERCHANGE Software for OpenVMS use.