Electrical Data And Options; Hart Digital Communication And 4 - ABB 265DS Operating Instruction

Technical data
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10.4 Electrical data and options

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10.4.1 HART digital communication and 4 ... 20 mA output current
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Power supply
The transmitter operates at voltages between 10.5 and 45 VDC with
no load, and is protected against reverse polarity connection
(additional load enables operation above 45 VDC).
With a backlit LCD display, the minimum voltage is 14 VDC.
In the case of the EEx ia version and other intrinsically safe,
approved versions, the supply voltage must not exceed 30 VDC.
Ripple
Maximum permissible supply voltage ripple during communication:
According to HART FSK "Physical Layer" specification rev. 8.1.
Load limitations
Total loop resistance with 4 ... 20 mA and HART:
−
Voltage sup ply Minimum
Ω =
R k ( )
Important
A minimum resistance of 250 Ω is required for HART
communication.
LCD display (optional)
19-segment alphanumeric display (two lines, six characters) with
additional bar chart display; option of backlighting for customized
display of:
• Output current in percent
• Output current in mA
• Freely selectable process variable
Diagnostic messages, alarms, measuring range upper limit violations,
and changes to the configuration are also displayed.
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70
operating voltage ( VDC
22 5 . mA
Output signal
4 ... 20 mA two-wire output, linear output signal,
horizontal cylindrical container, spherical vessel, or freely
programmable characteristic with 20 reference points.
Additionally, the following can be selected for the 265Dx:
Square root output signal or exponents 3/2 or 5/2
HART communication provides digital process variables (%, mA, or
physical units) superimposed on the 4 ... 20 mA signal (protocol in
accordance with Bell 202 FSK standard).
Output current limits (according to NAMUR standard)
Overload condition:
−
Lower limit: 3.8 mA (can be configured up to 3.5 mA)
−
Upper limit: 20.5 mA (can be configured up to 22.5 mA)
)
Alarm current
Minimum alarm current:
Maximum alarm current:
Default setting:
SIL: Functional safety (optional)
According to IEC 61 508/61 511
Device with certificate of conformity for use in safety-related
applications, up to and including SIL 2.
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265Dx, 265VS
Can be configured from
3.5 ... 4 mA;
Default setting: 3.6 mA
Can be configured from
20 ... 22.5 mA;
Default setting: 21 mA
Maximum alarm current
IM/265D/V-EN-02