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Connection
Example 3
In this case,
No communication is
possible when a four-
wire cable is used.
AXR Terminal
The range of load
The range of load resistance R for the pulse output must basically be 1 kΩ and 2 W. The load
resistance R for the
resistance should be selected by calculation as shown below when proper transmission is
pulse output
impossible due to the length of cable or frequency of pulse output.
Note: • The communication is possible though it might not meet a part of the HART communication specification depending on use
conditions.
• When using current and pulse output simultanously, the HART communication may be influenced by noise comparing analog
output only.
Cable
Resistance:R1[Ω]
+
SUPPLY
Cable
Resistance:R2[Ω]
−
+
DO
−
Grounding resistance
*8
of 100 Ω or less (When
the optional code A is
selected: grounding
resistance of 10 Ω)
E (V)
≤
≤
R (kΩ)
120
C (μF) × f (kHz)
2
E
(V)
.............................. (2)
P (mW) =
R (kΩ)
Description
Hazardous area Non-hazardous area
250Ω
JIS Class A
*9
*9
*5: This supply voltage requires a
power source with a maximum
output current of no less than (E5/R+0.0236).
E: Supply voltage (V)
0.1
... (1)
f: Frequency of pulse output (kHz)
R: Value of load resistance (kΩ)
C: Cable capacitance (μF)
P: Electrical power of the load resistance (mW)
Note: C 0.1 (μF/km) for CEV cable
<4. WIRING>
≤
0.0236×﴾R1
+
R2﴿
+
20.6
E5
+
Recorder
or other
−
instrument
*5
E5
*7
R
+
*6
Electric
−
counter
IM 01E30D01-01EN
4-16
≤
[
V
]
30
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