54 CoriolisMaster FCB400, FCH400 CORIOLIS MASS FLOWMETER | CI/FCB400/FCH400-EN REV. H
… 6 Electrical connections
… Electrical data for inputs and outputs
Digital output 41 / 42, 51 / 52 passive on distributed control
system
A Transmitter
B Distributed control system /
Memory programmable controller
Ex. 1 Input 1
Ex. 2 Input 2
R
X
Resistor for current limitation
R
I
Distributed control system
internal resistance
Figure 46: Digital output 41 / 42 on distributed control system (example)
The R
X
resistors limit the maximum current through the
optoelectronic coupler of the digital outputs in the transmitter.
The maximum permissible current is 25 mA. An R
X
value of
1000 Ω / 1 W is recommended at a voltage level of 24 V DC.
The input on the distributed control system is reduced from
24 V DC to 0 V DC (falling edge) with ‘1’ at the digital output.
Current output V3 / V4 active
When the ‘loop power supply 24 V DC, blue’ plug-in card is used,
the current output on the plug-in card can also be wired as the
active current output.
A ‘Loop power supply (blue)’ plug-in card in slot 1
B ‘Passive current output (red)’ plug-in card in slot 2
Figure 47: Active current output V3 / V4 (example)
Digital input V3 / V4 active
When the ‘loop power supply 24 V DC, blue’ plug-in card is used,
the current output on the plug-in card can also be wired as the
active current output.
A ‘Loop power supply (blue)’ plug-in card in slot 1
B ‘Passive digital input (yellow)’ plug-in card in slot 2
Figure 48: Active digital output V3 / V4 (example)
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