42 FEP630, FEH630 ELECTROMAGNETIC FLOWMETER | OI/FEP630/FEH630-EN REV. D
… 6 Electrical connections
… Pin assignment
Connection examples
Input and output functions are configured via the device
software in accordance with the desired application.
Parameter descriptions on page 78
Active digital output 41 / 42, 51 / 52, V3 / V4
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)!
G11744-01
A
V2-
V1+
IE
+24 V , max. 25 mADC
0V
41+
42/52
B
OC1
012345
R
B
A ‘Loop power supply (blue)’ plug-in card in slot 1
B Digital output, digital output 41 / 42
Figure 55: 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.
G11913
A
V2-
V1+
IE
+24 V , max. 25 mADC
0V
B
R
B
V4-
V3+
OC2
OC1
A ‘Loop power supply (blue)’ plug-in card in slot 1
B ‘Digital output (green)’ plug-in card in slot 2
Figure 56: Active digital output V3 / V4 (example)
Digital output 41 / 42, 51 / 52 passive on distributed
control system
G12366
A
Ex.1
Ex.2
0 V DC
16 ... 30 V DC
B
Rx
Rx
41+
51+
IE
42-/
52-
Ri
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 57: 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.
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