Power supplies and voltage concept
5981_en_06
PHOENIX CONTACT
33
Electrical isolation:
Digital terminal
Isolation of the I/O circuit of a digital terminal from the communications power is only
ensured if U
MUX
and U
M
/U
S
are provided from separate power supplies.
Electrical isolation:
Analog terminals
The I/O circuit (measuring amplifier) of an analog module receives floating power from the
24 V supply voltage U
ANA
. The power supply unit with electrical isolation is part of an analog
terminal. The voltage U
ANA
is looped through each terminal and is therefore available to the
next terminal.
Figure 4-5
Electrical isolation between field multiplexer and analog module
The potential jumpers hatched in the figure are not used in the analog terminal. This means
that the 24 V supply of the field multiplexer (U
MUX
) and the power terminal are electrically
isolated from the I/O circuit (measuring amplifier) of the analog terminal. The I/O circuit of
the analog module is supplied from the analog circuit U
ANA
.
5981B017
U
M
IB IL AI 2/SF-PAC
Local bus
IB IL 24 MUX MA-PAC
U
L+
U
ANA
U (GND
)
L-
MUX
OPC
EEPROM
REF
24 V
+5 V
/ +10 V
MUX
µP
4
U
S
1
2
5 V
24 V
24 V
7.5 V
24 V
5 V
m
C
IB IL AI 2/SF
electronics
Summary of Contents for 2861205
Page 1: ...User manual Configuring and installing the Inline field multiplexer...
Page 6: ...IB IL 24 MUX MA PAC 6 PHOENIX CONTACT 5981_en_06...
Page 26: ...IB IL 24 MUX MA PAC 26 PHOENIX CONTACT 5981_en_06...
Page 64: ...IB IL 24 MUX MA PAC 64 PHOENIX CONTACT 5981_en_06...
Page 86: ...IB IL 24 MUX MA PAC 86 PHOENIX CONTACT 5981_en_06...
