Siemens S7-300 Installation And Operating Manual page 183
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Wire-break check and underflow check in the range 4 to 20 mA
In the range 4 to 20 mA, a check is made to determine whether wire-break check is
assigned.
● If wire-break check is assigned, an underflow check is not performed. In
● In
Measured value resolution
The SM 336; AI 6 x 13Bit has a 13-bit resolution. That is, the last two bits are set to zero.
The values returned must be multiples of four. 1 digit (13-bit measuring range) corresponds
to 4 digits Simatic.
Table 9- 2
Bit number
Bit significance
Example
Table 9- 3
Measuring range
0 mA to 20 mA
4 mA to 20 mA
0 V to 10 V
Only the measuring range 4 to 20 mA is allowed when operating in safety mode.
Fail-safe signal modules
Installation and Operating Manual, 01/2010, A5E00085586-10
Systems
, wire break is reported with 7FFF
Safety
, the fail-safe value 0 is provided in the PII for the safety program in place of
7FFF
.
H
S7 F/FH Systems
, if wire-break check is not configured, underflow is reported with
8000
if the current is < 1.18 mA. In
H
provided in the PII for the safety program in place of 8000
Representation of the bit pattern
15
14
Sig
2
n
0
1
Resolution
WARNING
if the current is < 3.6 mA. In
H
S7 Distributed Safety
13
12
11
10
9
2
2
2
2
2
14
13
12
11
10
0
0
1
1
0
% of nominal range
0,014
0,014
0,014
9.2 SM 336; AI 6 x 13 Bit
, the fail-safe value 0 is
(for underflow).
H
8
7
6
5
4
2
2
2
2
2
9
8
7
6
5
0
1
1
1
1
Resolution
2.89 μA
2.32 μA
1.45 mV
Analog modules
S7 F/FH
S7 Distributed
3
2
1
0
2
2
2
2
4
3
2
1
0
1
1
0
0
183
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