Siemens SIMATIC S5-115F - Page 324

S5-115F Manual Rules Governing the Use of the S5-115F
Figure 10-24. Type 14 AI, Safety-Related, Non-Intermittent: Single-Channel Sensor with
Current Output; Two-Wire Transducer
24 V M
463-4U.AI
4 to 20 mA
0 to 20 mA
Subunit A Subunit B
458 - 7LA
CH Rel DQ
with tetrad bits
3210
- 7LA, 0 to 20 mA
- 7LC, 4 to 20 mA
470 CH AQ
463-4U.AI
As in
subunit A
Single-channel sensors must be
p e r m a n e n t l y f a i l s a f e and it must be
possible to interrupt current sensors
a a a a a
a a a a a
a a a a a
a a a a a
a a a a
a
a a
a
a
a a
a
a a a a
Analog
value
sensor: I
Constellation 4 to 20 mA may
only be configured as channel
Type 4
The use of two-wire transducers requires a dedicated power supply.
The following figure shows the wiring principle for redundant analog input modules with
two-wire transducers (channel 0). The necessary test wiring is not shown in the figure
.
Figure 10-25. Suggested Wiring of the 463 AI Module When Using Two-Wire Transducers
(without Test Wiring)
The number in brackets indicate terminal designations on the front connector of the 463-4U AI.
62.5 ohms 62.5 ohms
(7)(8)(11)(6)(7)(8)(11)(6)
4 to 20 mA
463-4U Analog
input module
463-4U Analog
input module
24 V
M
EWA 4NEB 811 6148-02 10-41