Yokogawa EJX115A - Manual (Page 46)

<3. Parameter Setting>
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IM 01C25T01-06EN
3.3.17.2 Setting on HART 7
HART 7
“Multidropping” transmitters refer to the connection
of several transmitters to a single communication
transmission line. Up to 63 transmitters can be
connected when set in the multidrop mode. To
activate multidrop communication, the transmitter
address must be changed to a number from 1 to 63.
If it sets to multidrop mode, in order to transmit all
the data in digital one, it is necessary to change a
setup of the analog output signal of 4 to 20 mA.
Setting of Multidrop Mode
(1) Polling address
• Procedure to call up the display
DD and DTM [Root Menu] → Detailed setup
→Output condition →HART
output →
→ Poll addr Enter the number from 1 to 63
NOTE
When the same polling address is set for
two or more transmitters in multidrop mode,
communication with these transmitters is
disabled.
(2) Analog Output Signal Setting
Set Disabled to
Loop current mode and fix
an analog output signal to 4mADC. It becomes
impossible in this case, to also use a burnout
output.
However, in the case of the application which
receives and operates an analog output signal, an
analog output signal can be used for one loop. In
this case, set Enabled to Loop current mode.
• Procedure to call up the display
DD and DTM [Root Menu] → Detailed setup
→Output condition →Analog output
→ Loop current mode →
Enabled Loop current mode is enabled.
Disabled Loop current mode is disabled.
(3) Enabling the Multidrop Mode of
Configuration Tool
About the procedure to call up the Polling
display, please refer to the User’s Manual of each
configuration tool.
(4) Communication when set in multidrop
mode.
• The HART configuration tool searches for a
transmitter that is set in multidrop mode when
it is turned on. When the HART configuration
tool is connected to the transmitter, the polling
address and the tag will be displayed.
• Select the desired transmitter. After that, normal
communication to the selected transmitter is
possible. However, the communication speed
will be slow.
To release multidrop mode, call up the Poll addr
display and set the address to “0”.
Return
Loop current mode to Enabled.
3.3.18 Switching HART Protocol Revision
When the output signal code is “-J”, HART protocol
revision of the transmitter can be selectable from 5
or 7.
The HART protocol revision is set and shipped as
specified in the order.
To change the HART protocol revision after
shipment, follow the procedure shown below.
IMPORTANT
When changing the protocol revision, confirm the
items below.
• Protocol revision supported by HART
configuration tool must be the same or
higher than new protocol revision of the
transmitter. (Refer to Table 2.1)
• Confirm that the DD or DTM which is suitable
to new protocol revision of transmitter is
installed in the configuration tool. (Refer to
Section 2.3 or 2.4)
1) Call up the parameter for protocol revision
change
• Procedure to call up the Chg universal rev
display.
DD and DTM
(excluding EJX_
HART 5[1.2])
[Root Menu] → Detailed setup
→ Device information → Field
device info → Revision #’s → Chg
universal rev
EJX_HART 5[1.2]
DTM
Configuration → HART → Chg
universal rev