2 Connecting to SIEMENS PLCs 2-4-4 SIEMENS S7-300 Ethernet (TCP Slave) 2-4 Supported Registers 2 2-4-4 SIEMENS S7-300 Ethernet (TCP Slave) Note 1 DBn_DBX, DBn_DBW, and DBn_DBD represent custom blocks. The top three digits of the Data block address indi- cate block number. The other five digits after the block number indicate address. If the address part is less than five digits, fill in '0's. For instance, if you access to DB20.DBX23.4, set DBn_DBX to 2000023.4. 2 When you access word access and double word access memories, always specify even address. 3 MB, IB, and QB do not support the signed integer number as data format.
4 If you define the Data block, secure the larger area than that used in the NB. For instance, if you use DB5.DBW32 in the NB, you should secure DB5.DBW34 or later in the PLC. 5 When you access data block of double word, you cannot access the maximum address. NB-series Programmable Terminals Host Connection Manual (V108) 2-29 Device Bit Address Word Address Format Note Data Register Nodes DBm DBX _ 0.0~65535.7 ------ DDDDD.O m:1 to 10 Data Register Nodes DBn DBX _ 100000.0~25565535.7 ------ DDDDDDDD.
O n:1 to 255 External Input Nodes I 0.0~2047.7 ------ DDDD.O Internal Auxiliary Nodes M 0.0~8191.7 ------ DDDD.O External Output Nodes Q 0.0~2047.7 ------ DDDD.O Data Registers (8-bit) ------ DBm DBB 0~65535 _ DDDDD m:1 to 10 Data Registers Nodes ------ DBm DBB 0~65535 _ DDDDD m:1 to 10 Data Registers (32-bit) ------ DBm DBD 0~65532 _ DDDDD m:1 to 10 Data Registers ------ DBm DBW _ 0~65534 DDDDD m:1 to 10 Data Registers ------ DBn DBB _ 100000~25565535 DDDDDDDD n:1 to 255 Data Registers (32-bit) ------ DBn DBD _ 100000~25565532 DDDDDDDD n:1 to 255 Data Registers ------ DBn DBW _ 100000~25565534 DDDDDDDD n:1 to 255 External Output Nodes ------ IB 0~2047 DDDD External Input Registers (32-bit) ------ ID 0~2044 DDDD External Input Registers ------ IW 0~2046 DDDD External Input Nodes ------ MB 0~8191 DDDD Internal Registers (32-bit) ------ MD 0~8188 DDDD Internal Registers ------ MW 0~8190 DDDD Internal Assistant Nodes ------ QB 0~2047 DDDD External Output Registers (32-bit) ------ QD 0~2044 DDDD External Output Registers ------ QW 0~2046 DDDD