Siemens SM 331 Guia De Inicio Rapido página 6

English
• During installation, the wire chamber (6ES7 393-4AA00-0AA0) must be used, or a minimum
clearance of 50 mm (minimum thread length) must be implemented between the non-intrinsically safe
circuits by inserting a barrier, and the terminals must have additional insulation (e.g. with shrinkdown
tubing).
Supply lines with wire-end ferrules
Wire chamber
Intrinsically safe signal lines with wire-end
f
It can also happen that the minimum thread length is not adhered to between the different modules
(e.g. in mixed use of explosion-proof and standard modules). If the minimum thread length between
conducting parts of explosion-proof and standard modules is less than 50 mm, the following options
are available to you for adhering to the thread length between the modules:
1. Install the DM 370 dummy group (6ES7 370-0AA01-0AA0) between the relevant explosion-proof
and standard modules.
2. When the bus modules of the active backplane bus are used, you can also use the explosion-proof
isolating bar (6ES7 195-1KA00-0XA0).
•
In wiring the submodule, you must strictly separate the intrinsically safe lines from the non-intrinsically
safe. They must be laid in separate cable ducts.
•
The analog module must be operated with safe functional extra-low voltage. This means that these
modules may be subject to a voltage of no more than Um ≤ 60 V (DC) or 30 V (AC), even in the
event of an error.
All sources of voltage (e.g. internal 24 VDC load power supplies, external 24 VDC load power
A5E00348726-03
Process connector
(screw connection)
English