Rockwell Automation 1734-IV4/C Point I/O Source Input Module Installation Instructions - Manual (Page 7)

POINT I/O Source Input Module 7
Publication 1734-IN052D-EN-E - February 2005
2. Make certain the DIN rail locking screw is in the horizontal position.
You cannot insert the module if the locking mechanism is unlocked.
3. Insert the module straight down into the mounting base and press to
secure. The module will lock into place.
Installing the Removable Terminal Block (RTB)
A removable terminal block is supplied with your wiring base assembly. To
remove, pull up on the RTB handle. This allows the mounting base to be
removed and replaced as necessary without removing any of the wiring. To
reinsert the removable terminal block, proceed as follows.
1. Insert the end opposite the handle into the base unit.
This end has a curved section that engages with the wiring base.
2. Rotate the terminal block into the wiring base until it locks itself in
place.
3. If an I/O module is installed, snap the RTB handle into place on the
module.
WARNING
When you insert or remove the module while
backplane power is on, an electrical arc can occur. This
could cause an explosion in hazardous location
installations.
Be sure that power is removed or the area is
nonhazardous before proceeding. Repeated electrical
arcing causes excessive wear to contacts on both the
module and its mating connector. Worn contacts may
create electrical resistance that can affect module
operation.