Emerson Rosemount 644h, Справочное руководство

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Reference Manual
00809-0100-4728, Rev HA
December 2002
4-7
Models 644H and 644R
Model 275 HART
Communicator
Table 4-2 provides a guide to diagnostic messages used by the Model 275
HART Communicator.
Variable parameters within the text of a message are indicated with the
notation
<variable parameter> . Reference to the name of another message is
identified by the notation [another message] .
Table 4-2. Model 275 HART
Diagnostics Messages
Electronics Module
• Connect a Model 275 HART Communicator and enter the transmitter status mode to isolate
module failure.
• Connect a Model 275 HART Communicator and check the sensor limits to ensure calibration
adjustments are within the sensor range.
Erratic Output Loop Wiring
• Check for adequate voltage to the transmitter. It should be 12.0 to 42.4 V dc at the transmitter
terminals (over entire 3.75 to 23 mA operating range).
• Check for intermittent shorts, open circuits, and multiple grounds.
• Connect a Model 275 HART Communicator and enter the Loop test mode to generate signals of
4 mA, 20 mA, and user-selected values.
Electronics
Module
• Connect a Model 275 HART Communicator and enter the transmitter test mode to isolate
module failure.
Low Output or No
Output Sensor Element
• Connect a Model 275 HART Communicator and enter the Transmitter test mode to isolate a
sensor failure.
• Check the process variable to see if it is out of range.
Loop Wiring
• Check for adequate voltage to the transmitter. It should be 12.0 to 42.4 V dc (over entire 3.75 to
23 mA operating range).
• Check for shorts and multiple grounds.
• Check for proper polarity at the signal terminal.
• Check the loop impedance.
• Connect a Model 275 HART Communicator and enter the Loop test mode.
• Check wire insulation to detect possible shorts to ground.
Electronics
Module
• Connect a Model 275 HART Communicator and check the sensor limits to ensure calibration
adjustments are within the sensor range.
• Connect a Model 275 HART Communicator and enter the Transmitter test mode to isolate an
electronics module failure.
Symptom Potential Source Corrective Action
Message Description
Add item for ALL device types or only for
this ONE device type Asks the user whether the hot key item being added should be added for all device types or
only for the type of device that is connected.
Command Not Implemented The connected device does not support this function.
Communication Error Either a device sends back a response indicating that the message it received was
unintelligible, or the Model 275 HART Communicator cannot understand the response from the
device.
Configuration memory not compatible with
connected device The configuration stored in memory is incompatible with the device to which a transfer has
been requested.
Device Busy The connected device is busy performing another task.
Device Disconnected Device fails to respond to a command.
Device write protected Device is in write-protect mode. Data can not be written.
Device write protected. Do you still want to
shut off? Device is in write-protect mode. Press YES to turn the Model 275 HART Communicator off and
lose the unsent data.
Display value of variable on hotkey menu? Asks whether the value of the variable should be displayed adjacent to its label on the hotkey
menu if the item being added to the hotkey menu is a variable.
Download data from configuration memory
to device Prompts user to press SEND softkey to initiate a memory to device transfer.
Exceed field width Indicates that the field width for the current arithmetic variable exceeds the device- specified
description edit format.