80-4280-10, Rev. 4
APPENDIX
HART
®
Communication
50
The DCM-2 board is the control center of the
actuator. actuator configuration and calibration
are accessed and set through the DCM-2 board.
Using the HART interface requires a HART
compatible communicator that contains files
specifically created to communicate with the
Beck actuator. Beck-written Device Description
Language Files (DDL) are certified by the HART
Communications Foundation. Communicators
such as the 375 and 475 use these files to access
the Group 22 features. Other communicators that
utilize alternative file formats (DOF for example)
may be commercially available, but rely on third
party software that is not directly supported by
Harold Beck and Sons, Inc.
This instruction manual supports Group
22 actuators built with DCM-2 part numbers
12-8224-41, 12-8224-45, 12-8224-51, and
12-8224-55, and describes how to access
features using the HART Communicator.
USING THE 375 OR 475
COMMUNICATOR
HART communicators require that the field
device manufacturer’s DD files be installed to
access device specific features. This can be
checked before connecting to the actuator. Turn
on the communicator, select “Offline”, then “New
Configuration.” Scroll to HAROLD BECK AND
SONS, and verify that BECK-MK2 is installed.
If it is not, contact the communicator supplier
or Beck for instructions on how to update the
communicator.
The communicator leads should be connected
to any of the acceptable communicator connection
points detailed on the following page. This allows
the communicator to simultaneously communicate
over the analog input wires, but does not disturb
the analog command signal or disrupt the DCM-2
functions. However, any program changes to the
DCM-2 will momentarily suspend the operation of
the module (maintains last state) while the change
is implemented. Typically, this is only for a second
or two.
With the communicator connected, turn on the
communicator and wait for communications to be
established. Once communicating, the “Online”
display will appear in the communicator window.
If applicable, select the “HART application” option
to access the online menu. If the actuator is
multidropped with other devices on a single HART
network, the first display screen will list all devices
and require a selection before the “Online” display
is shown. The “Online” display provides online
information about the present actuator operating
conditions. Entering any of the menus shown in the
menu structure is accomplished by following the
display and using the communicator’s arrow keys.
If the communicator is unable to communicate
with the DCM-2, it will display the message, “No
Device Found”. If this occurs, ensure that the
communicator is securely connected to any of
the acceptable communicator connection points,
and retry. If communications still do not occur, the
communicator polling setup may be improperly
set. Check the “utility” menu and make sure
communications polling is set to “always poll”.
The communicator keypad and display is
shown on the following page.
The LCD displays all the information and
actions available.
The function keys and on-screen buttons are
used to perform certain actions such as entering
settings, accessing help screens, sending
commands, paging up and down within methods,
and exiting methods. The function of each key/
button may change depending on the menu or
method selected. As functions change, so do the
dynamic labels in the LCD.
The arrow keys on the communicators allow
movement between menus as shown in the menu
structure.
The alphanumeric keys are used to type in
entries. Whenever a selected menu or method
requires a value or description to be entered, this
keypad is used. Since each key represents four
different characters, three shift keys are provided
at the bottom of the pad.
Before moving on, it may be helpful to
practice with the communicator. Connect the
communicator as described, turn it on and
establish communications. Then use the arrow
keys to move through the various menus as shown
in the menu structure.
