Rockwell Automation 1797-XXX FLEX Ex System Certification Reference Manual - Manual (Page 73)

1 Publication 1797-6.5.6 - June 2005
Chapter
13
1797-IJ2 FLEX Ex Frequency Input Module
General Information Modules must be used with a 1797-TB3 or -TB3S intrinsically safe terminal
base unit.
Module Installation Rotate keyswitch on terminal base unit clockwise to position 1 as required for
this type of module. Do not change the position of the keyswitch after
wiring the terminal base unit.
Inputs The frequency input module has 2 input channels. Each input can accept
inputs from magnetic pickups or proximity probes. Each input channel has 2
input selections: frequency input or gate input. Do not apply any
non-intrinsically safe signals to this module.
The channels in this module are electrically connected to each other.
When using an intrinsically safe electrical apparatus according to EN50020,
the European directives and regulations must be followed.
IMPORTANT
When interconnecting several lines, you must consider the
total accumulated power and check for intrinsic safety.