Analog value representation
4.4 Effect on analog value representation
2AO I HF analog electronic module (6ES7135-4MB02-0AB0)
Manual, 04/2007, A5E01076972-01
19
Output ranges for current: 4 to 20 mA
Table 4-4
SIMATIC S7 format: Output range 4 mA to 20 mA
Units
Output range
4 mA to 20 mA
Decimal
Hexadecimal
Range
0
> 32511
> 7EFF
H
Overflow
22,8100
:
20,0005
32511
:
27649
7EFF
H
:
6C01
H
Overshoot range
20,0000
:
4,0000
27648
:
0
6C00
H
:
0
H
Nominal range
3,9995
:
0
-1
:
-6912
FFFF
H
:
E500
H
Underrange
0
< -6913
< E4FF
H
Underflow
4.4
Effect on analog value representation
4.4.1
Effect of the supply voltage and the operating state on analog output values
The output values of the analog modules are dependent on the supply voltage for electronics
and on the operating state of the PLC (CPU of the DP master). This is illustrated by the table
below.
Table 4-5
Relationship between the analog output values for the operating state of the PLC (CPU
of the DP master) and the supply voltage L+.
Operating state of the PLC
(CPU of the DP master)
Supply voltage L+ on
ET 200S (power module)
Output value of the electronic module
with analog outputs
L+ present
PLC values
POWER ON
RUN
Until first value output:
•
After startup, a signal of 0 mA or
0 V is output.
•
Dependent on the parameter
"CPU/master STOP"
L+ present
Dependent on the parameter
"CPU/master STOP"
POWER ON
STOP
L+ missing
-
L+ present
Dependent on the parameter
"CPU/master STOP"
POWER OFF
-
L+ missing
-