Prerequisites for Zone 1 and Zone 21
Keep to the following rules in zone 1 and zone 21:
1. Use the RS 485-IS coupler (see appendix "Order Numbers").
2. If you want to loop the PROFIBUS RS 485-IS through to the next ET 200iSP, use the
PROFIBUS connector RS 485-IS (order no. 6ES7972‑0DA60-0XA0). To loop the module
through, connect the bus cable to the second cable outlet of the bus connector.
3. Terminate PROFIBUS RS 485-IS with the PROFIBUS connector RS 485-IS. The
PROFIBUS connector RS 485-IS (6ES7972-0DA60-0XA0) is equipped with an integrated
terminating resistor.
4. Use the bus cable specified in Appendix "Order Numbers" for PROFIBUS RS 485-IS and
mark the bus cable as an "Ex i bus cable". If you use a color as the identifier, you must
select light blue.
5. The shield of the bus cable must be connected to one of the following locations providing
a sure ground connection PA:
– Either at the transition of the bus cable from the safe area to the hazardous area
– or in the safe area directly at the RS 485-IS coupler. In this case, the shield must be
installed like an active circuit; in other words, protection against accidental touch must
also exist for the shield of the bus cable (IP 20).
Prerequisites for Zone 2 and Zone 22
Keep to the following rules in zone 2:
● See points 1 to 5:
Prerequisites for Zone 1 and Zone 21
Prerequisites for safe area
● See points 1 to 4:
Prerequisites for Zone 1 and Zone 21
Wiring
5.4 Wiring the ET 200iSP
ET 200iSP
Operating Instructions, 11/2017, A5E00247483-07
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