Resistance Measurement Ranges; Effect On Analog Value Representation; Effect Of The Supply Voltage And The Operating Status On Analog Input Values - Siemens Simatic ET 200S 2/4AI RTD ST Manual

4.3.2

Resistance measurement ranges

Measuring ranges for resistive sensors: 150 Ω, 300 Ω, 600 Ω
Table 4- 8 SIMATIC S7 format: Measuring ranges 150 Ω, 300 Ω, 600 Ω
Measuring range 150 Ω
> 176.38
176,38
:
150,005
150,00
112,50
:
0,00
4.4

Effect on analog value representation

4.4.1

Effect of the supply voltage and the operating status on analog input values

The input values of the analog modules are dependent on the supply voltage for
electronics/encoders and on the operating status of the PLC (CPU of the DP master). The
table below shows this dependency..
Table 4- 9
Operating state of the PLC
POWER ON
POWER ON
POWER OFF
2/4AI RTD ST analog electronic module (6ES7134-4JB51-0AB0)
Manual, 07/2008, A5E01076865-02
Measuring range 300 Ω
> 352,77
352,77
:
300,01
300,00
225,00
:
0,00
Relationship between the analog input values for the operating status of the PLC (CPU
of the DP master) and the supply voltage L+
(CPU of the DP master)
RUN
STOP
-
4.4 Effect on analog value representation
Measuring range
600 Ω
> 705,53
705,53
:
600,02
600,00
450,00
:
0,00
Power supply L+ on
ET 200S (power
module)
L+ present
L+ missing
L+ present
L+ missing
L+ present
L+ missing
Analog value representation
Units
Decimal hexadeci
mal
32767 7FFF
H
32511 7EFF
H
: :
27649 6C01
H
27648 6C00
H
20736 5100
H
: :
0 0
H
Input value of the electronic module with
analog inputs (evaluation possible on the
CPU of the DP master)
Process values
7FFF until first conversion after startup, or
H
after assignment of parameters for the
module is completed.
7FFF
H
Process value
7FFF
H
-
-
Range
Overflow
Overshoot range
Nominal range
25