When the setting of the DataObject Mod is changed at this level, all Logical Nodes inside thelogical device update their own behavior according to IEC61850-7-4. The supported values ofthe function block TESTMODE are described inCommunication protocol manual, IEC 61850Edition 2. When the function block TESTMODE is in test mode the Start LED on the LHMI isturned on with steady light.The parameterMod of any specific function block can be configured under Main menu/Test/Function test modes/Communication/Station CommunicationThe parameter Mod can be set on the LHMI to the same values as for the DataObject Mod ofthe Root LD.LNN0 toOn,Off,TestBlocked,Test orBlocked. For Example, Main menu/ Test/Function test modes/ Differential protection/GeneratorDiff(87G,3Id/I>)/ GENPDIF(87G,3Id/I>):1.It is possible that the behavior of the function block TESTMODE is also influenced by othersources as well, independent of the mode communicated via the IEC61850-8-1 station bus. Forexample the insertion of the test handle into the test switch with its auxiliary contact isconnected to a BI on the IED and further inside the configuration to the input IED_TEST on thefunction block TESTMODE. Another example is when loss of Service Values appears, or asexplained above the setting via the LHMI.When setting via PST or LHMI the parameterOperation of any function in an IED is set toOff,the function is not executed and the behavior (beh) is set toOff and it is not possible tooverride it. When a behavior of a function isOff the function will not execute. The relatedModkeeps its current state.When IEC 61850 Mod of a function is set toOff orBlocked, the Start LED on theLHMI will be set to flashing to indicate the abnormal operation of the IED.The IEC 61850-7-4 gives a detailed overview over all aspects of the test mode and other statesof mode and behavior. The status of a function block behaviorBeh is shown on the LHMI underthe Main menu/Test/Function status/Function group/Function block descriptive name/LNname/Outputs.• When theBeh of a function block is set toTest, the function block is not blocked and allcontrol commands with a test bit are accepted.• When theBeh of a function block is set toTest/blocked, all control commands with a testbit are accepted. Outputs to the process via a non-IEC 61850 link data are blocked by thefunction block. Only process-related outputs on function blocks related to primaryequipment are blocked. If there is an XCBR function block used, the outputsEXC_OpenandEXC_Close are blocked.• When theBeh of a function block is set toBlocked, all control commands with a test bitare accepted. Outputs to the process via a non-IEC 61850 link data are blocked by thefunction block. In addition, the function block can be blocked when theirBeh isblocked.This can be done if the function block has a block input.The block status of a component is shown on the LHMI as theBlk output under the same pathas forBeh:Main menu/Test/Function status/Function group/Function block descriptivename/LN name/Outputs. If theBlk output is not shown, the component cannot be blocked.16.12.2 Setting guidelines M15260-3 v7Remember always that there are two possible ways to place the IED in theTestMode=On”state. If, the IED is set to normal operation (TestMode =Off), but the functions are still shownbeing in the test mode, the input signal IED_TEST on the TESTMODE function block isactivated in the configuration.1MRK 505 355-UEN A Section 16Basic IED functions257Application manual
