WAGO WAGO-I/O-SYSTEM 750 Series Manual

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WAGO WAGO-I/O-SYSTEM 750 Series Manual Manual pdf 55 page image

Fieldbus-specific behavior ï 55DeviceNetWAGO-I/O-SYSTEM 750I/O Modules4.2 DeviceNet4.2.1 Accessing the process imageThe DeviceNet Master can access the AS-Interface data in two ways.With pre-defined instances of the assembly object, digital and analog inputand output data of a node are transferred to or from the master with onecommand. The application in the master can then address the data in thememory. The data are stored in the master in the same way as with mapping inthe coupler / controller. The byte-orientated module data (analog modules andspecial modules) and the bit-orientated module data (digital modules) arestored separately in the memory in arrays of bytes according to the input andoutput image. The appropriate array and the associated memory address canthus be determined from the type and position of the module.The data in the AS-Interface master can be directly addressed with the analoginput point object or the analog output point object. The instance number ofthe respective object is given by the position of the module in the node.4.2.1.1 ExampleLet a node contain the following modules with an input / output processimage:3 x 750-402 each with 4 bits of input data,1 x 750-452 4 bytes of input data,1 x 750-655 12 bytes of input data and 12 bytes of output data,1 x 750-550 4 bytes of output data,1 x 750-452 4 bytes of input data,1 x 750-550 4 bytes of output data,1 x 750-452 4 bytes of input data,1 x 750-504 4 bits of output data.The AS-Interface master module occupies a process image of 12 bytes whenthe mailbox size is 6 bytes. The mailbox is permanently superimposed.