Srtp Server Operation; Srtp Inactivity Timeout - GE PACSystems RXi User Manual

SRTP Server Operation

8.4
Remote Series 90 PLCs that use SRTP Channels COMMREQs expect the CPU to be in
slot 1. In order to support communications with Series 90 SRTP clients such as Series 90
PLCs using SRTP Channels, the RXi internally redirects incoming SRTP requests addressed
to rack 0, slot 1 to rack 0, slot 0.
8.4.1

SRTP Inactivity Timeout

The Ethernet interface supports inactivity checking on SRTP server connections with the
Proficy Machine Edition programmer. With this feature, the Ethernet interface removes an
abandoned SRTP server connection and all of 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 Proficy
Machine Edition programmer connections initially use an SRTP inactivity timeout value of 30
seconds Proficy Machine Edition can override the initial timeout value on a particular server
connection. Typically the 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 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:
GFK-2816F
Chapter 8. Gigabit Ethernet (GbE) Interface Overview and Operation
The SRTP inactivity timeout applies only to programmer connections over
SRTP. It does not affect HMI or SRTP channels.
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