6.4 HART
®
communication
The positioner must be supplied with at least
3.8 mA current.
A DTM file (Device Type Manager) conform
-
ing to the Specification 1.2 is available for
communication. This allows the device, for
example, to be run with the PACTware oper
-
ator interface. All the positioner's parame
-
ters are then accessible over the DTM and
the operator interface.
Note: In the case, complex functions are
started in the positioner, which require a
long calculation time or lead to a large
quantity of data being stored in the volatile
memory of the positioner, the alert “busy” is
issued by the DTM file.
This alert is not a fault alarm and can sim-
ply be confirmed.
Write protection
4
The write protection for HART communi-
cation can be disabled over Code 47.
You can only disable or enable this func
-
tion locally at the positioner.
The write protection is enabled by de
-
fault.
4
The on-site operation can be locked over
HART communication.
HART then blinks
on the display when Code 3 is selected.
This locking function can only be dis
-
abled over HART communication.
On-site operation is enabled by default.
6.4.1 Dynamic HART
®
variables
The HART
®
specification defines four dy
-
namic variables consisting of a value and an
engineering unit. These variables can be as
-
signed to device parameters as required.
The universal HART
®
command 3 (universal
command #3) reads the dynamic variables
out of the device. This allows manufac
-
turer-specific parameters to also be trans
-
ferred using a universal command.
The dynamic variables of Type 3731-3 can
be assigned as follows in the DD or
TROVIS-VIEW [Settings > Operation unit]:
EB 8387-3 EN 45
Operator controls and readings
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