Appendix BSpecifications
84
CPU Unit Specifications
Main Control
Element
MPU, CMOS, LS-TTL
Programming
Method
Ladder diagram
Instruction Length 1 address/instruction, 1 to 4 words/instruction
Number of
Instructions
CPU21-E/23-E 168 (12 basic instructions + 156 special instructions)
CPU31-E 172 (12 basic instructions + 160 special instructions)
Execution Time Basic instructions: 0.75 to 2.25 µs Special instructions: 34 to 724 µs
Memory Capacity 6,974 words (with 8k-word memory)
IR Area: I/O bits 480 bits
(00000 through
02915)
I/O bits for Group-2
High-density Units
and Group-2 B7A
I/O bits for I/O
Units mounted to
Slave Racks:
I/O bits for
Special I/O
Units: 1,600 bits
I/O bits for
Optical I/O Units:
512 bits (20000
IR Area: Work bits 3,296 bits
(03000 through
23515)
Interface Units: 320
bits (03000 through
04915)
800 bits (05000
through 09915)
(10000 through
19915)
through 23115)
SR bits 312 (23600 through 25507)
TR bits 8 (TR 0 through 7)
HR bits 1,600 (HR bits 0000 through 9915)
AR bits 448 (AR 0000 through 2715)
LR bits 1,024 (LR 0000 through 6315)
Timers/Counters 512 (TIM/CNT 000 through 511) TIMs: 0 through 999.9 s
TIMHs: 0 through 99.99 s CNT: 0 through 9999 counts
DM words Read/write: 1,000 (DM 0000 through 0999)
Read only: 1,000 (DM 1000 through 1999) DM area is in Memory Pack.
RUN Output Contacts are closed while PC is in RUN mode and operating.
Max. switching capacity: 2A 250 VAC (resistive load)
0.5 A 250 VAC (inductive load, cosφ = 0.4)
2 A 24 VDC
Power failure backup
function
Holds HR, AR, CNT, and DM contents. The memory backup period varies with the Memory Unit.
Memory Protection RAM Pack, battery back-up: Program (including clock function) and data areas protected.
EEPROM Pack (with clock function): Clock function and data areas protected.
C200H-CPU31-E: Program and data areas (including clock function) protected.
Battery life expectancy is 5 yrs at 25°C. Life expectancy decreases with higher temperature.
Refer to 2-6 Memory Units for more details.
RAM Pack, capacitor back-up: Program and data areas protected.
EPROM Pack: Data areas protected.
EEPROM Pack (without clock function): Data areas protected.
Memory is protected for 20 days without PC power at 25°C. Length of protection decreases at
higher temperature. Refer to Section 2-6 Memory Units for more details.
Self-diagnostic
Functions
CPU Unit failure (watchdog timer) Battery failure
Cycle time error Memory failure
I/O bus failure Host Link error
Remote I/O error, etc.
Program Check Program check (executed on start of RUN operation):
END missing Instruction errors
(Program can be checked by Programming Console or GPC at three levels.)
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