Analog modules
9.3 SM 336; F-AI 6 x 0/4 ... 20 mA HART
Fail-safe signal modules
230
Installation and Operating Manual, 01/2010, A5E00085586-10
WARNING
If there is a short circuit from L+ to Mn+, the input resistors will be destroyed.
You can avoid this problem through proper wiring and use of the internal sensor supply.
When an external sensor supply is used, other suitable measures are necessary to protect
the input resistors (e.g. fuse on the module).
Wiring schemes
Four wiring schemes (A to D or E to H) are available for each application, depending on the
type of measurement.
Table 9- 16 Wiring scheme of SM 336; F-AI 6 x 0/4 ... 20 mA HART
Wiring scheme
Measurement type
Channels
A
2-wire transducer, internal sensor supply
0 to 5
B
2-wire transducer, external sensor supply
0 to 5
C
4-wire transducer, internal sensor supply
0 to 5
D
4-wire transducer, external sensor supply
0 to 5
E
2-wire transducer, internal sensor supply with
module redundancy
0 to 5, redundancy with 2
modules
F
2-wire transducer, external sensor supply with
module redundancy
0 to 5, redundancy with 2
modules
G
4-wire transducer, internal sensor supply with
module redundancy
0 to 5, redundancy with 2
modules
H
4-wire transducer, external sensor supply with
module redundancy
0 to 5, redundancy with 2
modules
