164 ï I/O ModulesWAGO-I/O-SYSTEM 750Linux Fieldbus CouplerAS-interface Master Module750-655The length of the process image of the AS-interface master module can beset to fixed sizes of 12, 20, 24, 32, 40 or 48 bytes.It consists of a control or status byte, a mailbox with a size of 0, 6, 10, 12or 18 bytes and the AS-interface process data, which can range from 0 to32 bytes.The AS-interface master module has a total of 6 to maximally 24 wordsdata in both the Input and Output Process Image. Word alignment isapplied.The first Input and output word, which is assigned to an AS-interfacemaster module, contains the status / control byte and one empty byte.Subsequently the mailbox data are mapped, when the mailbox ispermanently superimposed (Mode 1).In the operating mode with suppressable mailbox (Mode 2), the mailboxand the cyclical process data are mapped next.The following words contain the remaining process data.Input and Output Process ImageByte DestinationOffset High Byte Low Byte Remark0 - C0/S0 not used Control/Statusbyte1 D1 D02 D3 D23 D5 D4... ... ...max. 23 D45 D44Mailbox (0, 3, 5, 6 or 9 words) /Process data (0-16 words)
