{
  "opc_url": "opc.tcp://192.168.1.100:4840",
  "counter_node": "ns=2;s=PL.TRACKMAP.COUNTER",
  "poll_interval": 2,
  "trackmap_nodes": {},
  "signal1_node": "ns=2;s=PL.Signal.EntryCoil",
  "signal2_node": "ns=2;s=PL.Signal.WeldDone"
}