beautypg.com

Siemens S5-135U/155U User Manual

Page 472

background image

9-90

System Manual

C79000-G8576-C199-06

The channels have the following designations on the module:

Channel 0:

M0 +
M0 –

Channel 1:

M1 +
M1 –

:

:

Channel 7:

M7 +
M7 –

Channels are arranged in groups of four, for which you can set separate
measuring ranges:

Channel group I:

Channels 0 to 3

Channel group II: Channels 4 to 7

The following figure shows the connection of sensors to the module.

You must observe the following condition:

U

E

+ U

CM

< 12 V

(i.e. the sum of the set voltage range and common-mode voltage must be less
than 12 V; current measuring ranges correspond to a voltage of 2.5 V).

M+

M–

M+

U

ISO

MUX

0 V Bus

+

+

U

E2

U

CM2

+

+

U

CM1

M–

0 V

ext

U

E1

Analog Input Module

U E1/2: Input Voltage

U ISO: Potential Difference

: Equipotential; this potential is established by the sensor reference potential
(external reference potential)

U CM1/2: Common-Mode Voltage

Figure 9-31

Connecting Sensors to the 466 Analog Input Module (Differential Measurement)

Analog Input/Output Modules