Yokogawa ADMAG AXF - Manual (Page 78)

IM 01E20C01-01E 8-2
8. OPERATION VIA HART COMMUNICATOR TOOL (HART 5)
8.2 Interconnection between AXFA11 and HART
Configuration Tool
The HART Configuration Tool can interface with the AXFA11 from the control room, the
AXFA11 site, or any other wiring termination point in the loop, provided there is a
minimum load resistance of 250
⍀ between the connection and the receiving instrument.
To communicate, it must be connected in parallel with the AXFA11, and the connections
must be non-polarized. Figure 8.2.1 illustrates the wiring connections for a direct interface
at the AXFA11 site. The HART Configuration Tool can be used for remote access from
any terminal strip as well.
USB
FieldMate
modem
USB
PC/FieldMate
AXFA11
4 to 20 mA DC signal line
Control room
Terminal board
Receiving instrument
load resistance:
250 Ω to 600 Ω
(including cable
resistance)
Relaying
terminals
I + I -
F0802.EPS
Figure 8.2.1 Interconnection Diagram
WARNING
Be sure to set parameters as "Protect" on the
write protect function after finish of parameter
setting work.
Under extremely rare case, the infra-red
switches may respond unexpectedly in such
conditions as sticking ball of water or extraneous
substances on the surface of display panel glass
according to the principle of infra-red switch
operation.
Its probability rises in such cases as sticking rain
water by storm or other similar situation and
washing up work near flowmeter installation
place.
Either to illuminate or stop illuminating the infra-
red switches by the flashlight may cause the
mis-reaction.
Refer to Chapter 6 "Menu P: Parameter Protec-
tion Items" and section "10.2.3" how to use the
write protect function in detail. This menu in the
275 is located at [Hot key]
→ [2 Wrt Protect Menu].
IMPORTANT
If the power of flowmeter is turned off within 30
seconds after parameters have been set, these
settings will be canceled. Accordingly, please
keep the power on for at least 30 seconds after
setting parameters.
NOTE
Before updating any setting, remember to always
check the data content you want to change as
described in Chapter 6: Parameter Description.
NOTE
In case of HART Configuration, the parameters
are displayed in English only.
Even if the language with the exception of
English is selected at “Language” setting display,
the parameters are displayed in English upon
HART Configuration Tool.