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This manual describes the DDB (Direct Data Bus) function used to realize data input/output with a
CNC while running a program developed with the user PLC ladder language.
DDB includes the synchronous type (DDBS) and the asynchronous type (DDBA), but only the
asynchronous type will be explained in this manual.
DDB is a function that allows the PLC to directly read and write the various data in the CNC. By
setting the information required for reading and writing into the buffer and calling out the DDB function,
he PLC can set (write) the designated data into the CNC. Generally, the data is read and written in
one piece units, but data related to the control axis can be processed for the designated number of
axes.
Features of this function include that the read data can be referred to in the step immediately following
he execution of the DDBA command. This also applies to the written data.
(Note 1) Note that for the parameters, they may not be valid immediately after writing.
(Note 2) Even for the parameters that will be valid immediately after writing, displaying the screen
again may be required in order to reflect changes to the data displayed on the screen.
(Note 3) The functions related to the specifications not added to the NC cannot be used with the
DDB.
This manual is organized in the following manner after the first chapter. Please refer to the required
section for use.
6. Example of
DDB with
Ladder Circuit
5. Explanation of
Read/write
Data
4. Sub-section
No. List
3. Selection No.
List

2. Usage of DDB
Function with
ladder



編碼器接頭 MR-J3ENCBL5M-A2-L
直流電抗器 FR-HEL-H11K
直流電抗器 FR-HEL-H0.4K
直流電抗器 FR-HEL-H1.5K
可控硅輸出模塊 FX2N-16EYS
以太網模塊 A1SJ71E71N-B5T
輸入輸出模塊 FX2N-8ER-ES/UL
輸出模塊 A0J2-E24S
帶以太網類型的Q系列CPU Q10UDEHCPU
DC 輸入/晶體管輸出模塊 AJ65VBTCE32-32DT
PLC FX1S-14MT-ESS/UL
繼電器輸出單元 FX0N-40ER
彈簧夾端子臺 Q6TE-18S
DC 輸入/晶體管輸出模塊 AJ65VBTCE32-16DT
可控硅輸出單元 FX2N-32ES
閃存卡 QD81MEM-4GBC
繼電器輸出模塊 FX2N-8EYR
輸出模塊 AY82EP
晶體管輸出模塊 FX2N-8EYT
MES接口模塊 QJ71MES96
輸入輸出模塊 A0J2-E28DR
晶體管輸出單元 FX2N-32ET
連接器 A6CON1E
PLC FX3U-16MT/ESS
串行通信單元 GT15-RS4-TE
輸入輸出模塊 AX80Y14CEU
輸出模塊 AY60EP
網絡模塊 A1SJ71E71N-T
PLC FX2N-48MT-ESS/UL
端子排模塊用電纜 AC10TB-E