Rockwell-automation 1794-OF8IH FLEX Isolated Input/Output HART Analog Bedienungsanleitung PDF herunterladen (Seite 117)

Publication 1794-UM065B-EN-E - September 2010

Additional HART Protocol Information 105

The second byte of this response code returns the operating status of HART

field devices. This byte may default to 0 when a communications error occurs

as indicated by bit 7 of the first byte being set.

IMPORTANT

The

The host processor ignores any values in the data field when a

communications error is detected.

HART Protocol – Communication Error Code

Bit Error Code Description

7 Communications Error If set, the field device has detected a communications error. Bits 0…6 indicate the type of error.

6 Vertical Parity Error The parity of one or more of the bytes received by the HART field device is incorrect.

5 Overrun Error At least one byte of data in the receive buffer of the HART field device was over-written before it

was read.

4 Framing Error The stop bit of one or more bytes received by the HART field device was not detected.

3 Longitudinal Parity Error The longitudinal parity calculated by the HART field device does not match the longitudinal parity

byte at the end of the packet.

2 Reserved Set to 0.

1 Buffer Overflow The packet is too long for the receive buffer of the HART field device.

0 Undefined Not defined.

HART Field Device Error Codes

Bit Error Code Description

7 Field Device Malfunction An internal hardware error or failure has been detected by the HART field device.

6 Configuration Changed A write or set command has been executed by the HART field device.

5 Cold Start Power has been removed and reapplied, resulting in the reinstallation of the setup information.

The first HART command to recognize this condition automatically resets this flag. This flag may

also be set following a master reset or self test.

4 More Status Available More status information is available and can be read using command #48. Read additional status

information.

3 Primary Variable Analog

Output Fixed

The analog and digital outputs for the primary variable are held at their requested value. They

will not respond to the applied process.

2 Primary Variable Analog

Output Saturated

The analog and digital outputs for the primary variables are beyond their limits and no longer

represent the true applied process.

1 Nonprimary Variable Out of

Limits

The process applied to a sensor, other than that of the primary variable, is beyond the operating

limits of the device. To identify the variable, use command #48, read additional status

information.

0 Primary Variable Out of

Limits

The process applied to the sensor for the primary variable is beyond the operating limits of the

device.

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