Main base Unit (power supply module required; cannot be extended0
2 I/O slots , power supply CPU 
Q32SB
3 I/O slots, power supply CPU 
Q33SB
5 I/O slots, power supply CPU 
Q35SB
Main base Unit (power supply module required;can be extended)
3 I/O slots, power supply CPU 
Q33B
5 I/O slots, power supply CPU 
Q35B
8 I/O slots, power supply CPU 
Q38B
12 I/O slots, power supply CPU 
Q312B
8 I/O slots, power supply CPU 
Q38RB
Extension base Unit (power supply module required;can be extended)
3 I/O slots, power supply 
Q63B
5
 I/O slots, power supply 
Q65B
8
 I/O slots, power supply 
Q68B
12 I/O slots, power supply 
Q612B
8 I/O slots, power supply power supply 
Q68RB
Extension base Unit (power supply module required;can be extended)
2 I/O slots Q52B
5 I/O slots Q55B
Redundant type extension base unit : Q65WRB
5 I/O slots power supply 
Q65WRB