Siemens SM 322 Manual Del Usuario página 4

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SM 322; DO 4 x 15 V/20 mA, 6ES7322-5RD00-0AB0, as of product state 04
Product Information Leaflet
This product information document contains important information on connecting signals from a
hazardous area to the SM 322; DO 4 x 15 V/20 mA.
Further Information
You will find more information on the module, the use of the DM 370 and explosion-proof isolating bar
and the isolation of intrinsically safe and non-intrinsically safe cables in the Reference Manual S7-300,
M7-300, ET 200M Automation Systems, I/O Modules with Intrinsically-Safe Signals (part of the
documentation package with the order number 6ES7 398-8RA00-8BA0).
Production Location
Siemens AG, Industry Sector, Postfach 1963, D-92209 Amberg
Certification II 3 (2) G Ex nA [ib] IIC T4
Note
Modules with the certification
/ ET 200M automation systems belonging to equipment category 3. Intrinsically safe electrical
equipment for zones 1 and 2 can be connected.
Maintenance
The digital module is maintenance-free. If a repair becomes necessary, the module must be sent to the
production location. Repairs may only be performed by the manufacturer.
Installation
•
The digital module must be installed outside the hazardous area in a suitable housing that complies
with the IP 20 degree of protection in accordance with EN 60529.
•
The digital module must be installed in a suitable housing inside the hazardous area (zone 2) that has
at least IP 54 protection in accordance with EN 60529, although the environmental conditions of
deployment also have to be taken into consideration. There must be a manufacturer's declaration for
zone 2 available for the housing (in accordance with EN 60079-15).
•
If a temperature of > 70 °C is reached in the cable or at the cable entry of this housing under
operating conditions, or if a temperature of > 80 °C can be reached at the junction of the conductors
under operating conditions, the temperature-related properties of the cables must correspond to the
temperatures actually measured.
Commissioning
•
Once the digital module is installed, all the relevant isolation, connecting cables and connections must
adhere to the conditions of Section 6.4 in accordance with EN 50020 – 1994.
•
Steps must be taken to ensure that the rated voltage through transients cannot be exceeded by more
than 40 %.
•
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).
A5E00348723-03
II 3 (2) G Ex nA [ib] IIC T4 can only be used in SIMATIC S7-300
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