Endress+Hauser RIA15 - HART Commands Used; Field Device Status

HART
®
communication
RIA15
56 Endress+Hauser
15.2
HART
®
commands used
The process display unit uses the following HART
®
universal commands:
Universal command number Response data used
0
Device unique identifier
The device identifier provides information on the device and
manufacturer; it cannot be changed.
The response comprises a 12-byte device identifier.
The following bytes are used by the process display unit:
• Byte 0: Fixed value 254
• Byte 2: Device type ID, for slave addressing with long address form
• Byte 3: Number of preambles
• Byte 9-11: Device identification, for slave addressing with long
address form
2
Read the primary process variable as
current in mA and percentage of
current range
The response comprises 8 bytes:
• Byte 0-3: Current in mA
• Byte 4-7: Percentage value
3
Read the primary process variable as
current in mA and four dynamic
process variables
The response comprises 24 bytes:
The following bytes are used by the process display unit:
• Byte 4: HART
®
unit code of the primary process variable
• Byte 5-8: Primary process variable
• Byte 9: HART
®
unit code of the secondary process variable
• Byte 10-13: Secondary process variable
• Byte 14: HART
®
unit code of the third process variable
• Byte 15-18: Third process variable
• Byte 19: HART
®
unit code of the fourth process variable
• Byte 20-23: Fourth process variable
The universal commands used by the process display unit must be supported by the slaves
to ensure proper communication.
15.3 Field device status
The field device status is contained in the second data byte of a slave/actor response.
The following bits are analyzed by the process indicator and displayed as a diagnostic
message:
Bit mask Definition Used in the process
display unit
0x80 Device error function – The device has detected a serious error or an
error function which affects the operation of the device.
Diagnostic F911
0x40 Configuration changed – A function was executed which has changed
the device configuration.
No
0x20 Cold start – The supply voltage has failed or the device has been reset. No
0x10 Additional status available – Additional status information is
available via command #48.
No
0x08 Loop current is fixed – The loop current is maintained at a fixed value
and does not react to changes in the process.
No
0x04 Loop current saturated – The loop current has reached its upper (or
lower) limit point and cannot increase (decrease) further.
Diagnostic S913
0x02 HART slave variable out of range. Diagnostic S915