Circuit Block Diagram - Siemens Simatic M7-400 Reference Manual

Meaning of Signals
The following table shows the meanings of the signals in Figure 13-10.
Table 13-38
Signal
MV ... MV
0+
MI ... MI
0+ 3+
M ... M
0- 3-
QV , QV
0 1
QI , QI
0 1
S , S
0 1
L
+
L1 , L2
+ +
M

Circuit Block Diagram

Figure 13-11 shows the circuit block diagram of the IF 961-AIO interface
submodule.
Internal
data bus
Internal
supply
Figure 13-11 Circuit Block Diagram of the IF 961-AIO Interface Submodule
S7-400, M7-400 Programmable Controllers Module Specifications
A5E00069467-07
Meaning of the Signals of the X1 Socket of the IF 961-AIO Interface
Submodule
Analog inputs: Voltage
3+
Analog inputs: Current
Reference potential of the analog inputs
Analog outputs: Voltage
Analog outputs: Current
Reference potential of the analog outputs
Voltage supply input 24 VDC
Outputs for supplying the 2-wire transducers (24 VDC)
Ground (0 V)
A
D
Current
limiter
A
D
Interface Submodules
Meaning
Inputs
U
CH 0
I
U
CH 1
I
U
CH 2
I
U
CH 3
I
L1
+
L2
+
Outputs
U
CH 0
I
U
CH 1
I
L+
M
13-35