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Fieldbus Controller 750-841 • 69Data ExchangeWAGO-I/O-SYSTEM 750ETHERNET TCP/IP3.1.6.2 Addressing3.1.6.2.1 Addressing the I/O ModulesThe arrangement of the I/O modules in a node is flexible and up to the user.Although, the user must verify that the power jumper contacts from one I/Omodule to the next are compatible and at the same voltage level.When the controller addresses I/O modules, data of complex modules (modulesoccupying 1 or more bytes) are mapped first. They are mapped in the order oftheir physical position after the controller. As such, they occupy the addressesbeginning with word 0. Following this, the digital modules are grouped in theform of words (16 bits per word). They are also arranged by their physicalorder. When the number of digital I/O’s exceeds 8 bits, the controllerautomatically starts another byte.NoteFor detailed information on the number of input and output bits/bytes of aspecific module, please refer to the modules manual.NoteChanging the physical layout of a node will result in a new structure of theprocess image. Also, the addresses of the process data will change. Whenadding or removing modules, the process data must be verified.Data width ≥ 1 Word / channel Data width = 1 Bit / channelAnalog input modules Digital input modulesAnalog output modules Digital output modulesInput modules for thermal elements Digital output modules with diagnosis (2 Bit / channel)Input modules for resistance sensors Power supply modules with fuse holder / diagnosisPulse width output modules Solid State power relayInterface module Relay output modulesUp/down counterI/O modules for angle and path measurementTable 3.1: I/O Module Data Width3.1.6.2.2 Address RangePartition of Address ranges for the word-wise addressing acc. to IEC 61131-3 :Word Data0-255 physical I/O modules256-511 MODBUS/TCP PFC variables512-1275 remaining physical I/O modules1276-1531 Ethernet/IP PFC variables1532-..... reserved for PFC variables of future protocols |
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