VEDA HCT User Manual Registers supported by Siemens S7-300 MPI 5 Siemens S7_300_network Siemens S7-300 Network cable 53 Device Bit Address Word Address Format Notes External output node Q.B0.0-511.7 —— DDD.O External input node I.B0.0-511.7 —— DDD.O Internal auxiliary node M.B0.0-4095.7 —— DDDD.O Data register node DBn DBX0.0-9999.7 _ —— DDDD.O The main address can be set during the hardware configuration.
External output register —— QW0-126 DDD External output register (32 bit) —— QD0-124 DDD External input register —— IW0-126 DDD External input register (32 bit) —— ID0-124 DDD Internal register —— MW0-2046 DDDD Internal register (32 bit) —— MD0-2044 DDDD Data register —— DBn DBW0-65534 _ DDDDD The main address can be set during the hardware configuration. Data register (32 bit) —— DBn DBD0-65532 _ DDDDD The main address can be set during the hardware configuration.