Siemens SM2 monitoring system, U3585-J-Z125-8-76 1 manual Example Calculating the time values

RESPONSETIME SM2 monitoring programs

Example: Calculating the time values

TI	TO1	TO2	TR	TO3	TO4	TI,next
t
TI	Input time stamp
TO	Output time stamp
TR	Time stamp of the current receive action in the BCAM application
RT1	= TO1-TI				Response time (definition 1)
RT2	= RT2, TO2-TO1, TO3-TO2, TO4-TO3Response time (definition 2)
TrT	= TO4-TI				Transaction time
ThT	= TI,next-TO4				Think time
WT	= TR-TI				Wait time

The outputs at times TO1,2 cannot refer to the input at time TI because the latter was not retrieved until time TR.

The outputs at times TO3,4 can (but need not) refer to the input at time TI.

Because the monitoring is performed in the BCAM transport system, no definite statement can be made about the logical (application-specific) connection between the individual inputs and outputs.

With dialog-oriented applications, each input is generally followed by the associated output, so the correct response times can be established.

SM2 interprets each message from a partner application to a BCAM application as an input and each message from a BCAM application to a partner application as an output. No distinction is made as to whether the communications partner of the BCAM application is a data display terminal or an application in a partner system.

In order to restrict monitoring to individual connections, SM2 employs the BCAM application name. SM2 assumes that the transmitter or receiver (data display terminal) has been uniquely assigned to a specific application name.

There are some special applications for which this application name has not been defined. Specific response time measurement by SM2 is not suitable for such cases, but the corre- sponding values are recorded in the total.

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