User`s manual

Basics Specification comparison of CPU
2 – 12
Q172DCPU and Q173DCPU
It is only possible to mount a Q172DCPU or Q173DCPU on a Q38DB or Q312DB type main base
unit. The PLC CPU must be an universal model CPU (QnUD(H)).
Tab. 2-9: Specification comparison of Q172DCPU and Q173DCPU
Q172DCPU Q173DCPU
No. of I/O device points (usable on program) 8192 8192
Real I/O points
(I/O in Main and Extension Base Units)
256 256
No. of control axes 8 32
Operation cycle With software SV13 0.44 ms (1 to 6 axes)
0.88 ms (7 and 8 axes)
0.44 ms (1 to 6 axes)
0.88 ms (7 to 18 axes)
1.77 ms (19 to 32 axes)
With software SV22 0.44 ms (1 to 4 axes)
0.88 ms (5 to 8 axes)
0.44 ms (1 to 4 axes)
0.88 ms (5 to 12 axes)
1.77 ms (13 to 28 axes)
3.55 ms (29 to 32 axes)
Program memory 14 k steps 14 k steps
Shared memory for multi-CPU operation 8 kByte 8 kByte
Shared memory for high speed data transfer in
multi-CPU operation
14 kByte 14 kByte
Memory cards Not usable Not usable
Power consumption (5 V DC) 1.14 A 1.25 A
Weight 0.33 kg 0.33 kg
Dimensions (HxWxD) [mm] 98x27.4x119.3
NOTE For more informations about motion controllers and operating system software refer to the
technical catalogue MELSEC System Q and to the User's Manual of the module and the
software.