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4.2 Controller Interface Buffer Memory Configuration
Unified Controller nv Series DeviceNet Module DN611B Instruction Manual
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4.2
Controller Interface Buffer Memory Configuration
In order to control DN611B with the controller and input/output data, read/write "Controller interface buffer
memory" inside DN611B with MREAD and MWRITE instructions. The memory configuration of DN611B seen
from the controller is shown below. The address format is a word.
Address
0000H Input / Output data area
(263 words)
0106H
0107H RAS information area
(456 words)
02CEH
02CFH Semaphore area
(305 words)
03FFH
4.2.1
Input / Output data area
This area is a storage area for data exchanged between DN611B and slave devices. It writes output data or
reads input data from the controller to this area. It writes data or reads input data from the controller to this
area.
Address
0000H Polling / Bit-Strobe Input Data Area
(128 words)
0080H Polling Output Data Area
(128 words)
0100H Bit-Strobe Output Data Area
(4 words = 64 bit)
0104H Reserved
■ Polling / Bit-Strobe Input Data Area
This is the area where the DN611B stores data collected from slave devices by polling and bit strobe methods.
The program of the controller reads data from this area. There are 128 words (2048 bits) in this area, so you
can connect up to 63 slave devices to one DN611B if the amount of data that the slave device sends to the
DN611B does not exceed the above amount.