Emerson Process Management 1500 Changing the fault timeout, Configuring digital communications

Optional Transmitter Configuration

Table 6-5Status alarms and severity levels continued

		Default		Affected by
Alarm code	ProLink II message	severity	Configurable?	fault timeout?
A118	DO1 Fixed	Info	Yes	No
A119	DO2 Fixed	Info	Yes	No
A131(2)	Meter Verification/Outputs at Last Value	Info	Yes	No

(1)Applies only to systems with the standard core processor.

(2)Applies only to systems with the enhanced core processor.

6.11.2Changing the fault timeout

By default, the transmitter immediately reports a fault when a fault is encountered. For specific faults, you can configure the transmitter to delay reporting the fault by changing the fault timeout to a non-zero value. If fault timeout is configured:

•During the fault timeout period, the transmitter continues to report its last valid measurement.

•The fault timeout applies only to the mA output and discrete output. Fault indication via digital communications is unaffected.

The fault timeout is not applicable to all faults. See Table 6-5 for information about which faults are affected by fault timeout.

6.12Configuring digital communications

The digital communications parameters control how the transmitter will communicate using Modbus/RS-485 protocol.

The following digital communications parameters can be configured:

•Fault indicator

•Modbus address

•RS-485 settings

•Floating-point byte order

•Additional communications response delay

6.12.1Changing the digital communications fault indicator

The transmitter can indicate fault conditions using a digital communications fault indicator. Table 6-6lists the options for the digital communications fault indicator.

Note: If an output is configured for valve control, the output will never go to fault levels.

Table 6-6Digital communications fault indicators and values

Fault indicator options	Fault output value
Upscale	Process variables indicate the value is greater than the upper sensor limit. Totalizers
	stop counting.
Downscale	Process variables indicate the value is less than the lower sensor limit. Totalizers stop
	counting.
Zero	Flow rates go to the value that represents zero flow, and density and temperature
	values are reported as zero. Totalizers stop counting.

Using the Transmitter

Optional Configuration

Filler Configuration

Using the Filler

Configuration and Use Manual 49