NI 9871 Operating Instructions 4 ni.com
Caution Do not remove modules unless power has been
switched off or the area is known to be nonhazardous.
Caution Substitution of components may impair
suitability for Class I, Division 2.
Caution For Zone 2 applications, install the
CompactRIO system in an enclosure rated to at least
IP 54 as defined by IEC 60529 and EN 60529.
Caution For Zone 2 applications, install a protection
device between the RS232 signal cables and the NI 9871
RJ-50 jacks (ports 1–4). The device must prevent the
RS232 signal-to-signal or signal-to-COM voltage from
exceeding 35 V if there is a transient overvoltage
condition.
Caution For Zone 2 applications, install a protection
device between the external power supply and the
NI 9871 V
sup
and COM pins. The device must prevent the
V
sup
-to-COM voltage from exceeding 39 V if there is a
transient overvoltage condition.
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