Product Description XI/ON - Eaton Automation

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XI/ON: Gateways for Modbus TCP 5 Implementation of Modbus TCP Description Hex Dezimal 5-Digit Modicon diagnostics (32 × 64 bytes) 0xA000 to 0xA400 Slot 1 0×A000 40960 - 440961 Slot 2 0×A020 40992 - 440993 Slot 3 0×A040 41034 - 441035 ... Slot 32 0×A3E0 41952 441953 parameters (32 × 64 bytes) 0xB000 to 0xB400 Slot 1 0×B000 45056 - 445057 Slot 2 0×B020 45088 - 445089 Slot 3 0×B040 45120 - 445121 ... Slot 32 0×B3E0 46048 446049 66 M001973-01, 07/2007
XI/ON: Gateways for Modbus TCP 5 Implementation of Modbus TCP 5.4 Structure of the Packed In-/ Output Process Data In order to assure a largely efficient access to the process data of a station, the module data are consistently packed and mapped to a coherent register area. The I/O-modules are divided into digital and intelligent modules (analog modules, serial interfaces). Both module types are mapped in separate register ranges. The data mapping always starts with the mapping of the intelligent modules. Each module occupies as many Modbus registers as necessary, depending on it’s data width. At least one register is occupied. A RS232-module, for example, occupies 4 consecutive registers (8 bytes) in the input and in the output area. The data byte arrangement is done according to the physical order in the station, from the left to the right. The data of the intelligent modules are followed by the data of the digital modules, also structured according to their physical appearance in the station. The Modbus registers for the digital data are filled up to 16 bit. This means on the one hand that one Modbus register can contain data of different digital modules and on the other hand that the data of one digital module can be distributed over multiple registers. Bit 0 of a digital module is thus not obligatory located on a word limit. Note An example in Chapter 6.3 „Communication examples: Modbus TCP”, Page 121. describes the data mapping. Additionally, the software I/O-ASSISTANT offers the possibility to create a mapping table for every station. M001973-01, 07/2007 67
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Product Description XI/ON - Eaton Automation

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