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1 OVERVIEW
1.1 Operation Overview for QD51 (-R24)
The QD51 (-R24) operates by BASIC programs created by the user.
The BASIC version that can be used by the QD51 (-R24) is AD51H-BASIC, which is
capable of multitasking processing of up to 2 tasks.
Besides the various calculations that can be carried out by a BASIC program created
by the user,
• Data can be sent to and received from an external device.
• Data can be sent to and received from the programmable controller CPU.
The operation in the QD51 (-R24) when data are sent to or received from an external
device or the programmable controller CPU is as shown below.
Programmable
controller
Data Sending
/Reception
• Interrupt request
• Data writing
1 - 2
Internal Memory
Expansion Relay
Data
reading
Expansion Register
Common Memory
Data writing
Buffer Memory
• Data reading
• Task start request
BASIC Program
Data
Task No. 1 Area
Writing
Data
reading
Task No. 2 Area
1 In the case of the QD51
In the case of the QD51-R24
MELSEC-Q
Interface
1
RS-232
Sending
RS-232
External
Device
RS-422
RS-485
Reception
RS-232
2 Channels
RS-232
1 Channel
RS-422/485
1 Channel
1 - 2
1
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