Connecting Signal Inputs - Siemens SITRANS DA400 Operating Instructions Manual

5.6

Connecting signal inputs

Safety notes
NOTICE
Electromagnetic Compatibility
To ensure high EMC interference immunity, use shielded leads in areas where there is a lot
of ambient interference. In SITRANS DA, connect the shield to the mounting plate.
NOTICE
Protection against explosion
For safety reasons, shields on all shielded leads should be connected at both ends and the
associated production resources should be connected to the equipotential bonding of the
hazardous area. Use only approved intrinsically safe power sources, as described in the
"Technical data" section."
General information
● The cable glands ② and ③ , each with two openings, are available for up to four signal
● Cable gland ② should be used for signal inputs "In 1" and "In 3".
● Cable gland ③ should be used for signal inputs "In 2" and "In 4".
● When wiring several signal sources (analog current and 24 V digital signal), it must be
Connecting the analog current 0/4 to 20 mA
Connect the analog current line in accordance with the following table:
Current signal
Connecting the 24 V digital signal
Connect the signal line in accordance with the following table:
Digital signal
SITRANS DA400 for material flow monitoring with protection against explosion
Operating Instructions, 09/2007, A5E00841152-01
inputs "In 1" to "In 4".
ensured that the four inputs relate to a common internal mass. Terminals 56, 66, 76 and
86 (if used) should therefore lead to a central star point in the system.
Terminal symbol
I+ I+
I- ⊥
Terminal symbol
+ DI
- ⊥
In 1 In 2
55 65
56 66
In 1 In 2
57 67
56 66
Connecting
5.6 Connecting signal inputs
In 3 In 4
75 85
76 86
In 3 In 4
77 87
76 86
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