Rockwell-automation FactoryTalk Metrics User Guide Instrukcja Użytkownika Pobierz pdf (Strona 106)

Chapter 3 Collecting Performance Data

Item Description

MOPCTimestampOf() Uses a single data point as a parameter to return the millisecond

component of the OPCTimestampOf() function. This value is an

integer between 0 and 999 milliseconds.

Tips:

• The Transaction Control Manager will correctly evaluate the

time as it was received from the OPC or FactoryTalk Live Data

server. The FactoryTalk Transaction Manager will substitute the

TimeStampOf() or MTimeStampOf() functions for the

OPCTimeStampOf() or MOPCTimeStampOf() functions.

• Any OPC time is returned to the Transaction Control Manager

service as an UTC-formatted time. If you specify the local

format, then the time is converted based on the local time of

the Transaction Control Manager service, not the local time on

the OPC or FactoryTalk Live Data server.

TransTimestamp() Returns a timestamp value that indicates when the transaction

occurred. This value is accurate to the nearest second.

MTransTimestamp() Returns the millisecond component of the TransTimestamp()

function. This value is an integer between 0 and 999 milliseconds.

An expression can contain a range of values which it can use to

calculate an average of the previous 10 transaction values ( avg (

datapoint [0:9]). This functionality also works to calculate the

minimum (min) or maximum (max) value of a data point over

several transactions. Note that the transaction must be run to reflect

changes in the historical values. The results, however, do not need to

be stored. Using the Store on Every N Transactions option, you can

collect the data needed for an average, but not store the data to the

database. If a transaction executes every second, but only stores its

data every 60 times and there is an avg ( datapoint [0:59]), the value

that is stored once a minute is the average of the values collected

every second.

Data Point Functions

106 Rockwell Automation Publication PLTMT-UM001M-EN-P-June 2014

1 2 ... 101 102 103 104 105 106 107 108 109 110 111 ... 271 272

Brak uwag

Rockwell-automation FactoryTalk Metrics User Guide Instrukcja Użytkownika Strona 106