FCI MT100 User Manual

MT100 Multipoint Flow Meter OPERATION
HART Command Bit Assignments
Command Status Bytes
The HART command response data field includes a status message in the first two bytes. The first byte (0) is the Comm Error/Response code.
The second byte (1) is the Device status. Byte 0 indicates either a communication error (b7=1, remaining bits=error details) or a response code
if no communication error exists (b7=0, remaining bits command response code integer value). Table 11 below summarizes the command status
bytes. A status bit is cleared (0) for no error. A status bit is set (1) when an error (or condition) is detected.
Table 11 – Command Status Bytes, Bit Assignments
Byte Bit
Error/Status Description
Communication Error
Response Code (No Comm Error)
Byte 0
0
Reserved – Bit cleared to zero.
Response Code (0-127)
1
Buffer Overflow – The message was too long for the
received buffer of the device.
2
Reserved – Bit cleared to zero.
3
Longitudinal Parity Error – The longitudinal parity
calculated by the device did not match the check byte at
the end of the message.
4
Framing Error – The stop bit of one or more bytes received
by the device was not detected by the UART (i.e., a mark or 1
was not detected when a stop bit should have occurred).
5
Overrun Error – At least one byte of data in the receive
buffer of the UART was overwritten before it was read (i.e.
the slave did not process incoming byte fast enough).
6
Vertical Parity Error – The parity of one or more of the bytes
received by the device was not odd
7
1: Set bit means byte represents communications error.
0: Cleared bit means byte represents response code.
Byte 1
Device
Status
0
Primary Variable Out of Limits – The PV is beyond its operating limit.
1
Non-Primary Variable Out of Limits – A device variable not mapped to the PV is beyond its operating limits.
2
Loop Current Saturated – The loop current has reached its upper (or lower) endpoint limit and cannot increase (or
decease) any further.
3
Loop Current Fixed – The loop current is being held at a fixed value and is not responding to process variations.
4
More Status Available – More status information is available via Command 48, Additional Device Status Bytes. See
below.
5
Cold Start – A power failure or device reset has occurred.
6
Configuration Changed – An operation was performed that changed the device’s configuration.
7
Device Malfunction – The device detected a serious error or failure that compromises device operation.
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FCI MT100 Specifications

General

Brand	FCI
Model	MT100
Category	Measuring Instruments
Language	English