Installation and operating instructions
IFC 020
2/3
2.4 Input / output connection diagrams
Terminal identification
IFC 020
E
separated, 19” plug-in unit, connection cap
X2
IFC 020
F
separated, field housing
IFC 020
K
compact
For connection and operation of the HART® interface,
see Section 6.1. Load at HART® operation ranges between min.
250
Ω
and max. 500
Ω
.
E: X2
F
K
I
Current output
C
Control input (
IFC 020 E
only)
P
Pulse output
S
Status output
RS 485
Interface
1
2
I
= 0/4 - 20 mA
U
ext
15...20 V DC 20...32 VDC
R
i
0...500
Ω
250...750
Ω
U
ext
≤
15 V DC
I
= 0/4 - 20 mA
R
i
≤
500
Ω
Current output
I
active
Current output
I
passive
Active mode
The current output supplies the power for
operation of the outputs and inputs.
Passive mode
External power source required for operation of
the outputs and inputs.
3
4
Pulse output P
passive
for electronic (EC) or
electromechanical (EMC) totalizers
U
ext
≤
30 V DC/
≤
24 V AC
I
max
≤
150 mA
(incl. status output S)
U
int
≤
15 V DC from current output
Operation
with
current output:
I
max
≤
3 mA
Operation
without
current output:
I
max
≤
23 mA
R
≤
15 V
I
max
Pulse output P
active
(and current output I
active
)
for electronic (EC) totalizers
with
and
without
current output I
Totalizer
- electronic (EC)
- electromechanical (EMC)
Milliammeter
0 or 4-20mA and others
Key, N/O contact
External voltage source (U
ext
),
DC or AC voltage,
connection polarity arbitrary
DC voltage,
external power source (U
ext
),
note connection polarity
U
ext
U
ext
I
max
+
