50 CoriolisMaster FCB400, FCH400 CORIOLIS MASS FLOWMETER | OI/FCB400/FCH400-EN REV. E
… 7 Electrical connections
… Pin assignment
Current output Uco / 32 as loop power supply for digital
output 41 / 42 or 51 / 52
G12391
A
B
R
B
IE
32-
31+
Uco
+
-
41+
51+
42-/
52-
V2-
V1+
A
B
Modbus /
PROFIBUS DP
A
B
R
B
IE
32-
31+
Uco
+
-
41+
51+
42-/
52-
V2-
V1+
A
B
Modbus /
PROFIBUS DP
OC1
OC1
A Transmitter FCx400
B Customer wiring
OC1 Modbus / PROFIBUS DP plug-in
card
R
B
Load resistance
Figure 33: Current output Uco / 32 in power mode
In the case of digital communication via Modbus / PROFIBUS DP,
the current output Uco / 32 can be switched to the ‘Power Mode’
operating mode through the software.
The current output 31/32/Uco is set permanently to 22.6 mA and
no longer follows the selected process variable. HART
communication is deactivated.
As a result, the passive digital outputs 41 / 42 or 51 / 52 can also
be operated as active digital outputs.
The load resistance R
B
needs to be integrated by the customer
outside of the transmitter housing.
Loop power supply 24 V DC pperating mode
Terminals Uco / 32
Function For active connection of passive outputs
Output Voltage Load dependent, see Figure 34.
Load rating I
max
22.6 mA, permanently short circuit-proof
Table 1: Specification current output Uco / 32 in power mode
G12393
0 500
1.00 k 1.50 k 2.00 k
0
5
10
15
20
25
30
[V]
[]Ω
22.6 mA
16 mA
Figure 34: Output voltage dependent on load resistance
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