CoriolisMaster FCB400, FCH400 CORIOLIS MASS FLOWMETER | CI/FCB400/FCH400-EN REV. H 53
24 V DC loop power supply (plug-in module)
Use of the ‘loop power supply (blue)’ plug-in card allows a
passive output on the transmitter to be used as an active
output. See also Connection examples on page 53.
Figure 42: (I = Internal, E = External)
The plug-in module can only be used in slot OC1.
Loop power supply 24 V DC
Terminals V1 / V2
Function For active connection of passive outputs
Output Voltage 24 V DC at 0 mA,
17 V DC at 25 mA
Load rating I
max
25 mA, permanently short circuit-proof
Note
If the device is used in potentially explosive atmospheres, the
plug-in card for the loop power supply may only be used to
supply a passive output. It is not allowed, to connect it to
multiple passive outputs!
Modbus® / PROFIBUS DP® interface V1 / V2 (plug-in card)
A Modbus or PROFIBUS DP interface can be implemented by
using the ‘Modbus RTU, RS485 (white)’ or ‘PROFIBUS DP, RS485
(white)’ plug-in cards.
Figure 43: Plug-in card as a Modbus / PROFIBUS DP interface (I = internal, E = external)
The corresponding plug-in card can only be used in slot OC1.
For information on communication through the Modbus or
PROFIBUS DP protocols, refer to chapters Modbus®
communication on page 61 and PROFIBUS DP® communication
on page 62.
Connection examples
Input and output functions are configured via the device
software in accordance with the desired application.
Digital output 41 / 42, 51 / 52, V3 / V4 active
When the ‘loop power supply 24 V DC (blue)’ plug-in card is used,
the digital outputs on the basic device and on the option
modules can also be wired as active digital outputs.
Note
Each ‘loop power supply (blue)’ plug-in card must only power one
output.
It must not be connected to two outputs (for example digital
output 41 / 42 and 51 / 52)!
A ‘Loop power supply (blue)’ plug-in card in slot 1
B Digital output, digital output 41 / 42
Figure 44: Active digital output 41 / 42 (example)
The connection example shows usage for digital output 41 / 42;
the same applies to usage for digital output 51 / 52.
A ‘Loop power supply (blue)’ plug-in card in slot 1
B ‘Digital output (green)’ plug-in card in slot 2
Figure 45: Active digital output V3 / V4 (example)
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