Yokogawa digitalYEWFLO (DY) - Manual (Page 64)

<8. OPERATION VIA HART CONFIGURATION TOOL (HART 5)>
8-4
IM 01F06A00-01EN
8.10.2 Multidrop Mode
“Multidropping” devices refers to the connection
of several devices to a single communications
transmission line. Up to 15 devices can be
connected when set in the multidrop mode. To
activate multidrop communication, the device
address must be changed to a number from 1 to
15. This change deactivates the 4 to 20 mA analog
output, sending it to 4 mA. The alarm current is also
disabled.
(1) Polling address
• Procedure to call up the display
DD (HART 5) [Root Menu] → Detailed setup →
Confi gure outputs → HART output →
DTM (HART 5) Confi guration → HART →
→ Poll addr Enter the number from 1 to 15
(2) Enabling the Multidrop Mode
About the procedure to call up the Polling
display, please refer to the User’s Manual of
each confi guration tool.
NOTE
When the same polling address is set for two or
more devices in multidrop mode, communication
with these devices are disabled.
(3) Communication when set in multidrop mode.
• The HART confi guration tool seaches for a
device that is set in multidrop mode when it is
turned on. When the HART confi guration tool
is connected to the device, the polling address
andthe tag will be displayed.
• Select the desired device. After that, normal
communication to the selected device is
possible. However, the communication speed
will be slow.
To release multidrop mode, call up the Poll addr
display and the address to “0”.
8.10.3 Switching HART Protocol Revision
When the output signal code is “-J”, HART protocol
revision of device can be selectable from 5 or 7.
The HART protocol revision is set and shipped as
specifi ed in the order.
To change the HART protocol revision after
shipment, follow the procedure shown below.
IMPORTANT
When change the protocol revision, confi rm the
items below.
• Protocol revision supported by HART
confi guration tool must be the same or
higher than new protocol revision of the
device. (Refer to Section 8.1 “HART Protocol
Revision”)
• Confi rm that the DD or DTM which is suitable
to new protocol revision of device is installed
in the confi guration tool. (Refer to Section
8.1 “HART Protocol Revision” and Section
8.2 “HART Confi guration Tool and Matching
of Device Revision”)
(1) Call up the parameter for protocol
revision change
• Call up the parameter for protocol revision
change Procedure to call up the Chng
universal rev display.
[Root Menu]  Detailed setup  Device
information  Revision numbers  Chng
universal rev
(2) Active the parameter for protocol
revision change
• Active the “Chng universal rev” method
IMPORTANT
The message is displayed to separate the device
from the automatic control loop.
Confi rm that the device is separated.
(3) Set the protocol revision number
Input the new revision number
An input column for new protocol revision
number is displayed.
Input the new HART protocol revision number
of “5” for HART 5 or “7” for HART 7.
Confi rm the revision number in the ‘Next
universal rev’.
[Root Menu]
→ Detailed setup → Device
information  Revision numbers  Next
universal rev
(4) Applying the new protocol revision
a. Close the confi guration tool
After completion of Chng universal rev
method, close the HART confi guration tool.