Other Operations For The Hart Configuration Tool - YOKOGAWA DY025 User Manual

■ Multidrop Mode
When set in the multidrop mode, up to 15 field devices in a
single communications line can be connected. To activate
multidrop communication, the address of the field devices
must be set to a number from 1 to 15. This deactivates the 4
to 20 mA analog output, fixing it to 4 mA. Burn out is also
disabled.
The multidrop mode is set as follows.
(1) Setting the polling address
The location in 4.6.10 Menu Tree is:
1. Device Setup → 4. Detailed Setup → 3. Configure
outputs → 5. HART Output → 1. Poll addr
Set a number from 1 to 15 to Poll addr.
(2) Activating the multidrop mode
The location in 4.6.10 Menu Tree is:
Online ↓ Utility → Configure Communication →
Polling
Confirm that any parameter of Polling is set to "Always
Poll," "Ask Before Polling," or "Digital Poll."
NOTE
1. If "Never Poll" or "Poll Using Tag" is
selected in "Polling", the "Online Menu"
cannot be called up and displayed. Be sure
to select "Digital Poll" in "Polling" after
assigned the polling address.
2. When the same polling address is assigned
for two or more field devices in multidrop
mode, communication with these field
devices is disabled.
(3) Communication when set in the multidrop mode
1. The HART Configuration Tool searches a field
device that is set in the multidrop mode when the
HART Configuration Tool is turned on.
When the HART Configuration Tool is connected to
the field device, the polling address and the tag will
be displayed.
2. Select the field device, and then communication with
it is possible. The communication speed is slow in
this case.
3. To communicate with another field device, turn off
the power once and then turn it back on, or call up
"Online" menu, and select "Online."
The polling address and the tag will appear. Select
the field device.
(4) Release of the multidrop mode
Call up the "Poll addr" display, and set the address to
"0."
4.6.9 Other operations for the HART
Configuration Tool
Regarding other operations for the HART Configuration
Tool, refer to the HART Configuration Tool operations
manual.
4-15
4. BASIC OPERATING PROCEDURES
IM 01F06A00-01E