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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



輸入輸出電纜 FX-A32E-500CAB
晶體管輸出模塊 AJ65SBTB1-8TE
輸入模塊 FX2N-16EX-ES/UL
直流電抗器 FR-HEL-H45K
緊停開關導桿 GT16H-60ESCOV
晶體管輸出模塊 FX2N-16EYT-C
晶體管輸出單元 FX2N-48ET-D
直流電抗器 FR-HEL-H1.5K
PLC FX1S-20MT-ESS/UL
網絡模塊 AJ71E71N-B2
輸入輸出模塊 A0J2-E56AR
繼電器輸出單元 FX0N-40ER
連接電纜 AC06TE
編碼器接頭 MR-J3ENSCBL10M-L
輸入輸出模塊 A0J2-E28AR
編碼器用接頭套件 MR-ENECNS
PLC FX2N-16MT-E/UL
小型CPU長距離連接電纜 GT15-C200EXSS-1
編碼器用電纜 MR-ENECBL10M-H
模塊 A1SJ71ME81
晶體管輸出模塊 AJ65VBTCE2-16T
PLC FX3U-48MT/ES-A
帶以太網類型的Q系列CPU Q50UDEHCPU
編碼器接頭 MR-J3ENSCBL2M-L
DC 輸入模塊 AJ65VBTCE3-8D
PLC FX3G-14MT/ES-A
以太網接口模塊 A1SJ71E71-B5-S3
脈沖輸出模塊 FX2N-1PG-E
速計數模塊 QD62E
網絡模塊 A1SJ71QE71N-B5T