11
System Configuration Section 1-2
Mounting Combinations 
Note 1. High-speed Counter Boards can be mounted in both slots of the CQM1H-
CPU51/61 simultaneously.
2. Analog Setting Boards cannot be mounted in both slots of the CQM1H-
CPU51/61 simultaneously.
1-2-5 Communications Units
Note A Communications Unit is connected between the Power Supply Unit and the
CPU Unit. Communications Units cannot be connected to Expansion I/O
Blocks.
Analog I/O Board Analog inputs of 0 to 5 V, 0 to 20 mA, ā10 to +10 V: 4 points
Analog outputs of 0 to 20 mA, ā10 to +10 V: 2 points
CQM1H-MAB42
Serial Communications Board One RS-232C port and one RS-422A/485 port CQM1H-SCB41
Name Specifications Model number
CPU Unit and slot Inner Board
High-speed 
Counter 
Board
Pulse I/O 
Board
Absolute 
Encoder 
Interface 
Board
Analog Set-
ting Board
Analog I/O 
Board
Serial Com-
munications 
Board
CQM1H- 
CTB41
CQM1H- 
PLB21
CQM1H- 
ABB21
CQM1H- 
AVB41
CQM1H- 
MAB42
CQM1H- 
SCB41
CQM1H- 
CPU61/51
Slot 1 
(left slot)
OK Not possible Not possible OK Not possible OK
Slot 2 
(right slot)
OK OK OK OK OK Not possible
CQM1H-CPU21/11 Not possible Not possible Not possible Not possible Not possible Not possible
CQM1H CPU Unit
Slot 1 for Inner Boards (left slot) Slot 2 for Inner Boards (right slot)
Name Specifications Model
Controller Link Unit (wired) Data link (Maximum number of words per node: 8,000)
Message communications (SEND/RECV/CMND instructions)
CQM1H-CLK21