User`s manual

Hardware specifications of the CPU modules Specifications
MELSEC System Q, Hardware 12 – 7
12.2.5 Redundant CPU
Item Q12PRH Q25PRH
Control method Stored program repeat operation
I/O control mode Refresh mode
Program language Ladder (LD), Instruction (IN), Sequential function chart (SFC), Function block
(FB), Structured text (ST)
Processing speed (sequence instruction) [ns/step]
LD: 34
MOV: 102
No. of I/O points
Usable on
program
8192
Accessible to
the actual I/O
module
4096
Constant scan (Function for keep-
ing regular scan time)
0.5 to 2000 ms (Setting available in 0.5 ms unit.)
Program memory
No. of program steps
(Drive 0)
124 k 252 k
Memory size refer to sections 2.2.5 and 4.2
Devices refer to section 4.1.5
Self diagnostic Plausibility of program, Watch Dog Timer (WDT monitor), battery monitor,
memory check, CPU check, line voltage monitor, fuse monitor, etc.
RUN/PAUSE contact One contact can be set up in X000 to 7FFF for each of RUN and PAUSE
Operation mode in case of error Stop or continue (set by parameters)
Output status after switching from
STOP to RUN
The outputs keep their status at the time, when the CPU stops, or they are
refreshed to the current process status with a delay time of one cycle.
Clock function
Year, month, date, hour, minute, second and day of the week (Automatic leap year detection)
Accuracy: –3.2 to +5.27 s (Typ. +2.07 s)/d at 0 °C
–2.77 to +5.2 7 s (Typ. +2.22 s)/d at 25 °C
–12.14 to +3.65 s (Typ. -2.89 s)/d at 55 °C
Allowable momentary power fail-
ure time
Varies depending on the power supply module
Current consumption (5 V DC) 0.89 A
Weight 0.3 kg
Tab. 12-7: Performance specifications of CPU types Q12PRH and Q25PRH