ABB CoriolisMaster FCH400 Series Operating Instructions Manual page 54

54 CoriolisMaster FCB400, FCH400 CORIOLIS MASS FLOWMETER | OI/FCB400/FCH400-EN REV. E
... 7 Electrical connections
... Pin assignment
Digital output 41 / 42, 51 / 52 passive on distributed
control system
I E
A
41+
51+
42-/
52-
A Transmitter
B Distributed control system /
Memory programmable controller
Ex. 1 Input 1
Figure 44: Digital output 41 / 42 on distributed control system (example)
The R resistors limit the maximum current through the
X
optoelectronic coupler of the digital outputs in the transmitter.
The maximum permissible current is 25 mA. An R
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.
B
16 ... 30 V DC
Ex.1
Ex.2
0 V DC
G12366
Ex. 2 Input 2
R Resistor for current limitation
X
R Distributed control system
I
internal resistance
value of
X
Active current output V3 / V4
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.
I
A
V2-
V3+
B
V4-
A 'Loop power supply (blue)' plug-in card in slot 1
B 'Passive current output (red)' plug-in card in slot 2
Figure 45: 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.
I
V1+
A
V3+
B
A 'Loop power supply (blue)' plug-in card in slot 1
B 'Passive digital input (yellow)' plug-in card in slot 2
Figure 46: Active digital output V3 / V4 (example)
E
+24 V DC , max. 25 mA
V1+
0V
G11742-01
E
+24 V DC , max. 25 mA
0V
V2-
V4-
G11914