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1 OVERVIEW
(3) Comparison of PLC CPU area control and performance
Item Q170MSCPU Q170MSCPU-S1 Q170MCPU
PLC CPU area
Q03UDCPU or
equivalent (30k steps)
Q06UDHCPU or
equivalent (60k steps)
Q03UDCPU or equivalent
(20k steps)
Control method Stored program repeat operation
I/O control mode Refresh mode
Sequence control language
Relay symbol language (ladder), logic symbolic language (list),
MELSAP3 (SFC), MELSAP-L, Structured text (ST)
Processing speed
(sequence instruction)
LD instruction 0.02 μs 0.0095 μs 0.02 μs
MOV instruction 0.04 μs 0.019 μs 0.04 μs
PC MIX value (instruction/μs) 28 60 28
Floating point addition 0.12 μs 0.057 μs 0.12 μs
Total number of instructions 858
Operation (floating point operation) instruction Yes
Character string processing instruction Yes
PID instruction Yes
Special function instruction (Trigonometric function,
square root, exponential operation, etc.)
Yes
Constant scan 0.5 to 2000ms (Setting available in 0.5ms unit.)
Program capacity
30k steps
(120k bytes)
60k steps
(240k bytes)
20k steps
(80k bytes)
CPU shared memory
QCPU standard memory 8k bytes
Multiple CPU high speed
transmission area
32k bytes
No. of I/O device points (X/Y) 8192 points
No. of I/O points (X/Y)
4096 points
512 points
(Up to 320 points (64
points × 5 modules) is
usable with I/O module.)
Internal relay (M)
Points by default
(changeable by parameters)
8192 points
Latch relay (L) 8192 points
Link relay (B) 8192 points
Timer (T) 2048 points
Retentive timer (ST) 0 points
Counter (C) 1024 points
Data register (D) 12288 points
Link register (W) 8192 points
Annunciator (F) 2048 points
Edge relay (V) 2048 points
Link special relay (SB) 2048 points
Link special register (SW) 2048 points
File register (R, ZR) 98304 points 393216 points 98304 points
Step relay (S) 8192 points
Index register/Standard device register (Z) 20 points
Index register (Z)
(32-bit modification specification of ZR device)
Up to 10 points (Z0 to Z18)
(Index register (Z) is used in double words.)
Pointer (P) 4096 points
Interrupt pointer (I) 256 points
Special relay (SM) 2048 points
Special register (SD) 2048 points
Function input (FX) 16 points
Function output (FY) 16 points
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