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MELSEC-Q
3 SPECIFICATIONS
3
3 SPECIFICATIONS
The following shows the performance specifications of the QD51 (-R24).
For general specifications, refer to the QCPU User's Manual (Hardware Design,
Maintenace and Inspection).
3.1 Performance Specifications
The performance specifications of the QD51 (-R24) are shown below.
Specification
Item
QD51 QD51-R24
Programming language AD51H-BASIC (Interpreter, Compiler)
Number of tasks 2
Task start conditions
• Start by power is turned on.
• Start by an interrupt from the programmable controller CPU.
(Not possible when compiled BASIC is used.)
• Start by a start request from another task.
Program Max. 64 kbytes (Task 1 capacity + Task 2 capacity ≤ 64 kbytes)
Common memory 8 kbytes
Buffer memory 6 kbytes
Expansion relay (EM) 1024 points
Internal memory
Expansion register (ED) 1024 points
General Input/Output Input: 26 points
Output: 23 points
Memory protection
Yes (Flash ROM write protectable) (
1
)
CH.1 RS-232 compatible (D-sub 9p) RS-232 compatible (D-sub 9p)
CH.2 RS-232 compatible (D-sub 9p)
Interfaces
CH.3
RS-422/485 (Two-piece terminal
block)
Communications method Full duplex communications
Synchronization method Start stop synchronization method
Transmission rate (
2
)
300, 600, 1200, 2400, 4800, 14,400, 19,200, 28,800, 38,400 (bps)
It is possible to use the 2 interfaces with a total transmission rate within
38,400 bps.
Start bit 1
Data bits 7 or 8
Parity bit Even, Odd, None
Data format (
2
)
Stop bit 1 or 2
DTR/DSR (ER/DR) control
RS/CS control
RS-232 only can be used, RS-422/485 cannot be used.
CD signal control None
DC1/DC3 (Xon/Xoff control) Both RS-232 and RS422/485 can be used.
Transmission control
DC2/DC4 control None
Clock function None
Power failure maintenance None
User program ROM Storage The program area only can be stored in Flash ROM.
(Continued to the next page)
1 For details, refer to Section 5.6.2.
2 The transmission rate and data format are set using the BASIC program
(ZOPEN command).
For details, refer to the Programming Manual (Commands).
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