Rockwell Automation 1797-XXX FLEX Ex System Certification Reference Manual User Manual

Page 113

Publication 1797-6.5.6 - June 2005

1797-IBN16 FLEX Ex 16 NAMUR Input Module 24-5

The entity concept allows interconnection of intrinsically safe apparatus

with associated apparatus not specifically examined in combination as a system
when the approved values of V

and I

or V

and I

of the associated apparatus

are less than or equal to V

max

and I

max

of the intrinsically safe apparatus and the

approved values of C

and L

of the associated apparatus are greater than C

cable

and L

+ L

cable

respectively for the intrinsically safe apparatus.

Simple apparatus is defined as a device which neither generates nor stores

more than 1.2V, 0.1A, 20µJ, or 25mW.

Wiring methods must be in accordance with the National Electric Code,

ANSI/NFPA 70, Article 504 and 505 or the Canadian Electric Code CSA
C22.1, Part 1, Appendix F. For additional information refer to ANSI/ISA
RP12.6.

This module, 1797-IBN16, must be used with terminal base 1797-TB3 or

1797-TB3S.

Terminals 36-39, and 46-49 shall not be connected.

Any combination of up to eight channels may be connected in parallel and

connected to simple apparatus in a hazardous location. If two channels are
connected in parallel, the total cable inductance must be limited to 20mH for
Groups A and B, 80mH for Groups C and E, and 160mH for Groups D, F,
and G. If eight channels are connected in parallel, the total cable inductance
must be limited to 2mH for Groups A and B, 8mH for Groups C and E and
16mH for Groups D, F, and G.

WARNING: Substitution of components may impair intrinsic safety.

AVERTISSEMENT: La substitution de composant peut compromettre la
securite intrinseque.

The ambient operating temperature (T

amb

) for this product is -20°C to

70°C.

Suitable for Class II, Division 1, Groups E, F, G and Class III when

mounted in a UL listed Type 4, 4X, 6, 6P, 9, 12, or 12K enclosure.