Siemens SIMATIC S5-90U System Manual page 466

Module Spectrum
Connection of the Module
Figure 15-22 shows how to connect loads to the voltage outputs of the module.
The sensor lines (S+ and S-) must be directly connected to the load, so that the voltage is
measured and regulated directly at the load. In this manner, voltage drops of up to 3 V per line can
be compensated for.
The sensor lines can be left out if the resistances of the QV and M lines are negligible compared to
the load resistance. In such a case, connect terminal S + to terminal QV, and terminal S to M
1
+
L M
DC 24 V
(4/8) (3/7)
QV S+
R
L
Figure 15-22. Load Connection via a Four-Wire Circuit (6ES5 470-8MD12)
Analog Value Representation
Table 15-37. Analog Output Module 470-8MD12 (Unipolar)
Units Output Values
in V
1280 6.0
1025 5.004
1024 5.0
512 3.0
1 1.004
0 1.0
- 1 - 0.996
- 256 0.0
- 512 - 1.0
- 1024 - 3.0
- 1280 - 4.0
15-100
S+ S- S+
3 5 7
QV
M QV
ANA
2 4 6 8
(5/9) (6/10) Terminal assignment
S- M Terminals
ANA
High Byte
0 1 0 1 0 0
0 1 0 0 0 0
0 1 0 0 0 0 0 0 0 0 0 0 x x x x
0 0 1 0 0 0 0 0 0 0 0 0 x x x x
0 0 0 0 0 0 0 0 0 0 0 1 x x x x
0 0 0 0 0 0 0 0 0 0 0 0 x x x x
1 1 1 1 1 1 1 1 1 1 1 1 x x x x
1 1 1 1 0 0 0 0 0 0 0 0 x x x x
1 1 0 0 0 0 0 0 0 0 0 0 x x x x
1 1 0 0 0 0 0 0 0 0 0 0 x x x x
1 0 1 1 0 0 0 0 0 0 0 0 x x x x
S-
Key:
9
QV:
M
ANA
S±:
M :
ANA
10
R :
L
Low Byte
0 0 0 0 0 0 x x x x
0 0 0 0 0 1 x x x x
S5-90U/S5-95U
.
ANA
Analog output "Voltage"
Sensor line
Chassis ground terminal
of the analog unit
Load resistor
Range
Overrange
Nominal range
Overrange
EWA 4NEB 812 6115-02b