Basics Of Analog Value Processing; Connecting Measuring Sensors - Siemens Simantic ET 200S Manual

Analog electronic modules

4.3 Basics of Analog Value Processing

Output modules for voltage and current: 1 V to 5 V; 4 mA to 20 mA
Table 4-24
4.3 Basics of Analog Value Processing
4.3
4.3.1

Connecting measuring sensors

Introduction
You can connect different measuring sensors to the analog input modules, depending on the
type of module involved:
• Voltage sensor
• Current sensors as:
• Resistance-type sensor
In this chapter you will find out how to connect the measuring sensors and what to watch for
when doing so.
Lines for analog signals
You should use shielded and twisted-pair lines for the analog signals. This reduces the effect
of interference. You should ground the shield of the analog lines at both ends of the line. If
there are differences in potential between the ends of the line, a compensating current flows
via the shield that can interfere with the analog signals. If this is the case, you should only
ground the shield at one end of the line.
4-14
SIMATIC S7 format: Output ranges 1 V to 5 V; 4 mA to 20 mA
Output range
Up to 5 V
0
5.7000
:
5.0002
5.0000
:
1.0000
0.9998
:
0
0
– 2-wire transducer
– 4-wire transducer
Output range
up to 20 mA
Decimal
0 > 32511
22.8100 32511
:
20.0005 27649
20.0000 27648
:
4.0000
3.9995
:
0 -6912
0 < -6913
Units
Hexadeci
mal
> 7EFF Overflow
H
7EFF Overshoot range
H
: :
6C01
H
6C00
H
: : Rated range
0 0
H
-1 FFFF Undershoot range
H
: :
E500
H
< E4FF Underflow
H
Manual, Edition 10/2005, A5E00514527-01
Range
ET 200S