Analog modules
9.3 SM 336; F-AI 6 x 0/4 ... 20 mA HART
Fail-safe signal modules
222
Installation and Operating Manual, 01/2010, A5E00085586-10
9.3
SM 336; F-AI 6 x 0/4 ... 20 mA HART
9.3.1
Analog value representation
Measured value ranges
Table 9- 13 Measured value ranges of SM 336; F-AI 6 x 0/4 ... 20 mA HART
Measuring range
Unit
Range
0 to 20 mA
4 to 20 mA
as
percentage
of the
nominal
range
Decimal
Hexadecim
al
> 23.518 mA
> 22.814 mA
> 117,589
32767
7FFF
H 2
Overflow
23.518 mA
.
.
20.0007 mA
22.814 mA
.
.
20.0006 mA
117,589
.
.
100,004
32511
.
.
27649
7EFF
H
.
.
6C01
H
Overrange
20 mA
:
0.4442 mA
< 0.4442 mA
:
723.4 nA
0 mA
(7FFF
H
)
20 mA
.
.
.
4 mA +
578.7 nA
4.00 mA
100
:
2,221
.
.
0,0036
0
27648
:
614
.
.
1
0
6C00
H
:
266
H
.
.
1
H
0
H
Nominal range
7FFF
H 1
3.9995 mA
.
.
0.4444 mA
-0,0036
.
.
-22,222
-1
.
.
-6144
FFFF
H
.
.
E800
H
Underrange
7FFF
H
< 0.4444 mA
(see below)
< -22,222
-32768
8000
H 2
Underflow
1
The module is signaling a wire break, 7FFF
H
.
2
In
S7 F/FH Systems
a fail-safe value is output for this value in the safety program when overflow or
underflow is detected.
In
S7 Distributed Safety
, the fail-safe value 0 is provided in the PII for the safety program in place of
7FFF
H
(for overflow) and 8000
H
(for underflow).
See also the "S7-300 Automation System module data
(
