GE PACSystems RX7i, User Manual

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Chapter 1. Introduction
10 PACSystems* RX7i & RX3i TCP/IP Ethernet Communications User Manual GFK-2224Q
SRTP Inactivity Timeout
Starting with Release 6.00, the PACSystems Ethernet interface supports inactivity checking on SRTP server
connections with any Proficy Machine Edition (PME) PLC programmer. With this feature, the Ethernet interface
removes an abandoned SRTP server connection and all its resources when there is no activity on the connection
for a specified timeout interval. (For example, when communication with the programmer is lost.) Until the server
connection is removed, other programmers cannot switch from Monitor to Programmer mode.
Without the SRTP inactivity timeout, an abandoned SRTP server connection persists until the underlying TCP
connection eventually times out (typically 7 minutes). All network PME programmer connections initially use an
SRTP inactivity timeout value of 30 seconds (as set by the "vconn_tout" AUP parameter). Revision 6.00 and higher
PME programmers can override the initial timeout value on a particular server connection. Typically the PME
programmer sets the SRTP inactivity timeout to 20 seconds. An inactivity timeout value of zero disables SRTP
inactivity timeout checking.
The SRTP server uses an internal inactivity timeout resolution of 5 seconds. This has two effects. First, any non-
zero inactivity timeout value (either set by AUP parameter or overridden on the programmer connection) is
rounded up to the next multiple of 5 seconds. Additionally, the actual SRTP inactivity timeout detection for any
individual connection may vary up to an additional 5 seconds. The actual inactivity detection time will never be
less than the specified value.
Note: The SRTP inactivity timeout applies only to programmer connections over SRTP. It does not affect HMI or
SRTP channels.