Yokogawa AXFA14G/C - Manual (Page 72)

IM 01E20C02-01E 7-3
7. OPERATION VIA BRAIN TERMINAL (BT200)
7.2 AXFA14 Operation
Using a BT200
This section describes procedures for setting parameters
using a BRAIN Terminal (BT200). For more details
regarding AXFA14 functions, refer to Chapter 6:
Parameter Description; and for more details regarding
BT200 operation methods, refer to the BT200 User’s
Manual (IM 01C00A11-01E).
7.2.1 BT200 Connection
Connection to a 4 to 20 mA DC signal line
The communication signal is superimposed onto the 4
to 20 mA DC analog signals to be transmitted.
AXFA14 terminals
BT200 BT200 BT200
Relaying
terminals
4 to 20 mA
DC signal
transmission
line
Control room
Receiving
resistance:
250 to 450
⍀
Receiving
instrument
Terminal
board
F0705.EPS
I
I
CURRENT
OUTPUT
G
SB
B
A
SA
C
2
1 N/ –
L/ +
+
–
+
–
+
–
DO
POWER
SUPPLY EX
EXCITATION
SIGNAL
DIO
I
Figure 7.2 Connecting the BT200
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 “10.2.2” how to use the
write protect function in detail.
IMPORTANT
Restrictions exist with regard to the distance
over which communication is possible. (See
Chapter 11: Outline.)
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.
IMPORTANT
After approximately 5 minutes of inactivity, the
Auto Power-Off function will operate to turn your
BT200 off.
NOTE
In case of BT200, the parameters are displayed
in English only.
Even if the language with the exception of English
is selected at B10/H30: Language, the param-
eters are displayed in English upon BT200.
7.2.2 The data update and upload/
download function of BT200
(1) The data update of BT200
When the following parameters are displayed, the
measured data is updated automatically every seven
seconds.
T0704.EPS
Item
G42
G43
G44
G45
G46
G47
G48
N32
P20
P23
Name (BRAIN)
ALM TIME 1
ALM RECORD2
ALM TIME 2
ALM RECORD3
ALM TIME 3
ALM RECORD4
ALM TIME 4
TEST DIO (I)
W PROTECT
SOFT SEAL
Item
A10
A20
A21
A30
A31
A32
C44
G22
G40
G41
Name (BRAIN)
FLOW RATE (%)
FLOW RATE
FLW RATE (mA)
TOTAL
REV TOTAL
DIF TOTAL
VELOCITY CHK
4-20 BURNOUT
OPERATE TIME
ALM RECORD1