192 ï GlossaryWAGO-I/O-SYSTEM 750ETHERNET TCP/IPManchester encodingIn this encoding system, a 1 is encoded as a transition from low to high and a0 as a transition from high to low.MIBShort form for "Management Information Base". MIB is a sellection ofinfomation on all parameters, which can be handed over to the managementsoftware with a request via SNMP. Thus can be made remote maintenance, amonitoring and a control of nets by SNMP protocol.ModulesFunctions, function blocks and programs are modules.Each module has a declaration part and a body, the latter being written inone of the IEC programming languages IL (instruction list), ST (structuredtext), SFC (sequential flow), FBD (function block diagram) or LD (ladderdiagram).MS-DOSOperating system, which allows all applications direct access to thehardware.OOpen MODBUS/TCP SpecificationSpecification which establishes the specific structure of a MODBUS/TCPdata packet. This is dependant upon the selected function code.Operating systemSoftware which links the application programs to the hardware.PPing commandWhen a ping command (ping ) is entered, the ping programICMP generates echo request packets. It is used to test whether a node isavailable.