ABB SensyMaster FMT430 - Page 58

58 SensyMaster FMT430, FMT450 THERMAL MASS FLOWMETER | OI/FMT430/450-EN REV. B
… 7 Electrical connections
… Electrical data for inputs and outputs
Current output Uco / 32 as loop power supply for digital output 41 / 42 or 51 / 52
A
Transmitter FCx400
B
Customer wiring
OC1
Modbus / PROFIBUS DP plug-
in
card
R
B
Load resistance
Figure 44: 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 44
.
Load rating I
max
22.6 mA, permanently short circuit-proof
Table 2: Specification current output Uco / 32 in power mode
Figure 45: Output voltage dependent on load resistance