Siemens SIMATIC ET 200iS, Manual, Page: 57 / 434

Configuration Options
ET 200iS Distributed I/O Station
A5E00087831-02
4-5
4.4 Configuration Options in Zones
General Rules
Regardless of the configuration of the ET 200iS in zone 1, zone 2 or in the safe
area, the following rules apply:
If the inputs and outputs to the actuators are intrinsically safe, then
PROFIBUS-DP must also be intrinsically safe (Ex i):
1. Fieldbus isolating transformer required (for example, from R. STAHL
Schaltgeräte GmbH; Refer to the order numbers)
2. Marking of PROFIBUS-DP as Ex i (not only in zone 1!)
3. Marking of the cables/wires to the actuators and sensors as Ex i (for example,
using the color light blue).
Warning
All devices you connect to PROFIBUS-DP Ex i (on the Ex side of the fieldbus
isolating transformer) must be intrinsically safe.
Connecting voltage measurement devices, oscillographs, and bus testers to
PROFIBUS-DP Ex i is not permitted.
Rules for Configuring the ET 200iS in Zone 1:
If you use the ET 200iS in zone 1, you must adhere to the following rules:
1. The ET 200iS must be installed in an enclosure with type of protection EEx e
(increased safety). For information on ordering such enclosures, contact your
Siemens representative
2. PROFIBUS-DP must be isolated using a fieldbus isolating transformer. The
fieldbus isolating transformer (for example from R. STAHL Schaltgeräte GmbH;
refer to the section Order Numbers) guarantees degree of protection EEx i for
PROFIBUS-DP in hazardous areas (zone 1).
The fieldbus isolating transformer must be installed in the safe area. See
Appendix Order Numbers.
3. Normal PROFIBUS-DP bus cables can be used in zone 1. See appendix Order
Numbers. You must, however, mark these as "EEx i bus cable" (for example
with a blue band/blue shrink-on sleeve at the ends or mark the cable with a blue
color).