MODULE 
DESCRIPTIONS 
I 
Extension Base 
Units 
I 
The  extension base  units are for  mounting an  extra  power supply  module andlor 
extra 
110 
modules if required. The  requirement for the extra 110  modules depends 
on the  number of 
110 
modules you  are  using on  your system,  if it exceeds the 
number of 
110 
slots on the CPU  base unit you  have selected then 
one 
extension 
base unit is required. Connection of the extension base unit to the CPU base unit is 
made by an extension cable, one extension base unit can be used per system. 
The requirement of an extra power supply module is dependent  on the total 
5 
VDC 
current  consumption  of  the  complete  A1S  system,  if one 
is 
required then  an 
extension base with a power supply module slot should be selected. The number of 
110 
module slots and,  if there is a power supply module slot, is dependent upon the 
extension base  model number.  A list of all different AIS extension base units 
is 
shown below; 
I 
Model 
No. 
AlS52B 
I 
Extension base unit with spare 
110 
slots for 2 
110 
modules. 
External dimensions, 135 mm x 130 mm x 28 mm (5.31  in x 5.12 in x 1.10 in) 
Manual Reference No.  IB(NA) 66320, AISCPU User's Manual 
I 
Model 
No. 
AlS55B 
I 
Extension base unit with spare, 110 slots for 
5 
110 
modules. 
External dimensions, 260 mm 
x 
130 mm 
x 
28 
mm (10.24 in 
x 
5.12 in x 1.10 in) 
Manual Reference 
No. 
IB(NA) 66320, 
AI 
SCPU User's Manual 
10