User manual

IEC61131 User and Reference Manual
April 22, 2008
305
Outputs
Type
Description
status
Integer
This output contains the status of the HART command
sent to the HART device.
0 =HART interface module is not communicating
1 =Command ready to send to device
2 =Command sent to device
3 =Response received
4 =No valid response received after all attempts made
5 =HART interface is not ready to transmit
code
Integer
This output contains one of the following depending on
the command status.
 The number of the current command attempt, or,
 Zero if the hart device does not respond after all
command attempts, or,
 The response code from the HART device to the
command sent. See the Response Code section
below for information on response codes.
v1Current
Float
primary variable current
u1Current
Integer
primary variable current units code
v1
Float
primary variable value
u1
Integer
primary variable units code
v2
Float
secondary variable value
u2
Integer
secondary variable units code
v3
Float
tertiary variable value
u3
Integer
tertiary variable units code
v4
Float
fourth variable value
u4
Integer
fourth variable units code
See Also
hart1, hart2, hart33
HART Device Response Codes
The code output of the function block contains the response code from the HART device
contains communication error and status information. The information varies by device, but
there are some common values.
If bit 7 of the high byte is set, the high byte contains a communication error summary. This
field is bit-mapped. The following table shows the meaning of each bit as defined by the
HART protocol specifications. Consult the documentation for the HART device for more
information.
Bit
Description
6
vertical parity error
5
overrun error
4
framing error
3
longitudinal parity error
2
reserved – always 0