Endress+Hauser NRF81 - Page 29

Tankside Monitor NRF81 Electrical connection
Endress+Hauser 29
6.1.7 Connection of the "Analog I/O" module for active usage
• In the active usage the supply voltage for the communication line is supplied by the
device itself. There is no need of an external power supply.
• The wiring must be in accordance with the intended operating mode of the Analog
I/O module; see the drawings below.
• Maximum current consumption of the connected HART devices: 24 mA
(i.e. 4 mA per device if 6 devices are connected).
• Output voltage of the Ex-d module: 17.0 V@4 mA to 10.5 V@22 mA
• Output voltage of the Ex-ia module: 18.5 V@4 mA to 12.5 V@22 mA
"Operating mode" = "4..20mA output" or "HART slave +4..20mA output"
D
E
F
C
B
A
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1
1 3
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2 4
1
HR
CDI
WP
on
SIM
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1
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G
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POWER
b
a
-
+
E
G
F
1
1
1 3
2
2 4
HR
CDI
WP
on
SIM
i
D
C
B
A
1
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G
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POWER
A0027932
 11 Active usage of the Analog I/O module in the output mode
a HART signal output
b Analog signal evaluation
"Operating mode" = "4..20mA input" or "HART master+4..20mA input"
D
E
F
C
B
A
1
1
1
1 3
2
2 4
1
HR
CDI
WP
on
SIM
2
2
3
3
4
4
1
1
2
2
3
3
4
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6
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i
G
1
3
2
POWER
E
G
F
1
1
1 3
2
2 4
HR
CDI
WP
on
SIM
i
D
C
B
A
1
1
2
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3
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4
4
1
1
2
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G
1
3
2
POWER
-
+
a
A0027935
 12 Active usage of the Analog I/O module in the input mode
a External device with 4...20mA and/or HART signal output