I 
 INSTALLATION^ 
nstallation and removal 
of 
dustproof cover 
I 
When an extension base unit which does not have a power supply module is used 
i.e. 
AIS52B, AIS55B, 
or 
AIS58B, 
it is necessaty 
to 
install a dustproof cover which 
is supplied with  the  extension base  unit  on  to  the 
110 
module  installed  at  the 
leftmost end of the base unit. This is to prevent any foreign matter from entering 
the I/O module which may cause malfunction of the 
I/O 
module itself. 
1. 
Installation 
To 
insert the dustproof cover onto the I/O module, first insert the cover to the 
terminal/connector side and press the dustproof cover against the 
I/O 
module as 
shown below; 
110 
module 
~ 
Dustproof 
cover 
Removal 
To 
remove the dustproof cover fit the tip of a flat bladed screwdriver in the notch 
on the left side of the dustproof cover. While keeping the tip of the screwdriver 
in the notch, gently move the screwdriver to the left (as shown  below)  until the 
cover snaps open. 
110  module 
DustDrmf cover 
51