ABB CoriolisMaster FCH400 Series Operating Instructions Manual page 50

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
A
-
OC1
A
-
OC1
A Transmitter FCx400
B Customer wiring
Figure 33: Current output Uco / 32 in power mode
I E
+
Uco
32-
31+
41+
51+
42-/
52-
V1+ A
Modbus /
PROFIBUS DP
V2- B
I E
+
Uco
32-
31+
41+
51+
42-/
52-
A
V1+
Modbus /
PROFIBUS DP
B
V2-
OC1 Modbus / PROFIBUS DP plug-in
card
R Load resistance
B
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
B
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
outside of the transmitter housing.
Loop power supply 24 V DC pperating mode
Terminals
Function
Output Voltage
Load rating I
max
Table 1: Specification current output Uco / 32 in power mode
B
[V]
30
25
20
15
22.6 mA
10
5
0
0
G12391
Figure 34: Output voltage dependent on load resistance
needs to be integrated by the customer
B
Uco / 32
For active connection of passive outputs
Load dependent, see Figure 34.
22.6 mA, permanently short circuit-proof
16 mA
500 1.00 k
[ ] Ω
1.50 k 2.00 k
G12393