Rockwell-automation FactoryTalk Metrics User Guide Uživatelský manuál stáhnout pdf (Strana 108)

Chapter 3 Collecting Performance Data

Item Description

QualityOf() Uses one parameter to return three OPC server values. The values in

parentheses in the first column of the following table represent the

OPC bit values for quality. The corresponding converted QualityOf()

turn values are displayed in the second column. This function only

applies to OPC or FactoryTalk data servers. If you are using a DDE

server, a Good value is always returned.

OPC Server

QualityOf()

Bad (0)

Uncertain (1) 2

N/A (2)

Good (3)

If you use the Use Bad Quality option and you have chosen the

QualityOf() expression string from the Expression Editor dialog

box, along with the Substitute Previous Value option, the

FactoryTalk Live Data server sends bad quality data to the control

connector. The control connector logs the bad quality and passes it

to the Transaction Manager service. The Transaction Manager

service substitutes the previous data point's value, as well as the

QualityOf() the previous data point's value, and then passes good

quality to the enterprise connector. The enterprise connector then

logs good quality.

If you use the Use Bad Quality option and you have chosen the

QualityOf() expression string from the Expression Editor dialog

box, along with the Substitute Value option, the FactoryTalk Live

Data server sends bad quality to the control connector. The control

connector logs the bad quality and passes it to the Transaction

Manager service. The Transaction Manager service uses the

specified substitute value, and then passes good quality to the

enterprise connector. The enterprise connector then logs good

quality.

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

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Rockwell-automation FactoryTalk Metrics User Guide Uživatelský manuál Strana 108