Справочник Пользователя для Siemens Network Hardware SM2 monitoring system
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U3585-J-Z125-8-76
RESPONSETIME
SM2 monitoring programs
Example: Calculating the time values
The outputs at times T
O1,2
cannot refer to the input at time T
I
because the latter was not
retrieved until time T
R
.
The outputs at times T
O3,4
can (but need not) refer to the input at time T
I
.
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.
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.
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.
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.
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.
T
I
Input time stamp
T
O
Output time stamp
T
R
Time stamp of the current receive action in the BCAM application
RT
1
= T
O1
-T
I
Response time (definition 1)
RT
2
= RT
2
, T
O2
-T
O1
, T
O3
-T
O2
, T
O4
-T
O3
Response time (definition 2)
TrT
= T
O4
-T
I
Transaction time
ThT
= T
I,next
-T
O4
Think time
WT
= T
R
-T
I
Wait time
T
I
T
O1
T
O2
T
R
T
O3
T
O4
T
I,next
t