Siemens M7-400, S7-400 Meaning of Signals, Circuit Block Diagram

Interface Submodules
13-35
S7-400, M7-400 Programmable Controllers Module Specifications
A5E00069467-07
Meaning of Signals
The following table shows the meanings of the signals in Figure 13-10.
Table 13-38 Meaning of the Signals of the X1 Socket of the IF 961-AIO Interface
Submodule
Signal Meaning
MV0+ ... MV3+ Analog inputs: Voltage
MI0+ ... MI3+ Analog inputs: Current
M0- ... M3- Reference potential of the analog inputs
QV0, QV1Analog outputs: Voltage
QI0, QI1Analog outputs: Current
S0, S1Reference potential of the analog outputs
L+Voltage supply input 24 VDC
L1+, L2+Outputs for supplying the 2-wire transducers (24 VDC)
MGround (0 V)
Circuit Block Diagram
Figure 13-11 shows the circuit block diagram of the IF 961-AIO interface
submodule.
M
L+
A
D
Internal
supply
U
I
U
I
U
I
U
I
CH 0
CH 1
CH 2
CH 3
A
D
U
I
U
I
CH 0
CH 1
Inputs
Outputs
Internal
data bus L1+
L2+
Current
limiter
Figure 13-11 Circuit Block Diagram of the IF 961-AIO Interface Submodule