Siemens SIMATIC S7-300 Module data - Connecting Two-Wire Transmitters to an Isolated AI

Analog Modules
4-52
Programmable Logic Controllers S7-300 Module Data
A5E00105505-03
Connecting 2-wire transmitters
M+
M
L+
M–
M
ANA
M+
M–
ADC
Two-wire
transmitter
Two-wire
transmitter
P
P
+
–
+
–
Sensor,
for example,
pressure gauge
Backplane
bus
Logic
Figure 4-12 Connecting two-wire transmitters to an isolated AI
When the supply voltage L+ is fed from the module, you must assign parameters
to the two-wire transmitter as a four-wire transmitter in STEP 7.
M
L+
M
ANA
M+
M–
ADC
2-wire
trans
mitter
–
Backplane
bus
+
P
Sensor,
for example,
pressure gauge
Logic
Figure 4-13 Connecting two-wire transmitters supplied from L+ to an
isolated AI
Connecting four-wire transmitters
M+
M
L+
M–
M
ANA
M+
M–
ADC
P
P
Sensor,
for example,
pressure gauge
transmitter Four-wire
+
–
+
–
L+
M
Backplane
bus
Logic
Figure 4-14 Connecting four-wire transmitters to an isolated AI