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One field per controller board. The tick is set when the board releases the main contactor. If it is missing, the board is holding the contactor off – because it has detected a fault itself, is still in update mode or is just starting up. The event log then shows WRN-99, “No release for main contactor” with the name of the board. The field reports what the board itself switches – whether the chain actually goes through is shown by “Boards OK”. On the causes, see FAQ-06, “Contactor does not pick up”. The ladder diagram shows how it fits together, Figure 26.