diff --git a/internal/module/m9zTtyApi/read.go b/internal/module/m9zTtyApi/read.go
index 486de44..8777029 100644
--- a/internal/module/m9zTtyApi/read.go
+++ b/internal/module/m9zTtyApi/read.go
@@ -155,11 +155,12 @@ func getDeviceStatus2Real(rpc towgo.JsonRpcConnection) {
 	}
 	d := new(DeviceStatus)
 	d.DeviceStatus = *read
-	loopCount := configuredLoopCount()
-	d.ScanDeviceCount = loopCount
-	loops := make([]DeviceStatusLoop, loopCount)
+	scanLoopCount := configuredLoopCount()
+	displayLoopCount := monitorDisplayLoopCount()
+	d.ScanDeviceCount = scanLoopCount
+	loops := make([]DeviceStatusLoop, displayLoopCount)
 	var wg sync.WaitGroup
-	for i := 0; i < loopCount; i++ {
+	for i := 0; i < displayLoopCount; i++ {
 		idx := i
 		wg.Add(1)
 		go func() {
@@ -175,10 +176,12 @@ func getDeviceStatus2Real(rpc towgo.JsonRpcConnection) {
 				loop.A = parametersRead.DCCurrent
 				kw := float64(loop.V*loop.A) / 1000
 				loop.Kw = float32(math.Round(kw*1000) / 1000)
-				loop.Faults = m9z.BuildLoopFaults(uint(idx+1), parametersRead.AlarmStatus, parametersRead.AlarmCode)
-				loop.HasFault = len(loop.Faults) > 0
-				loop.FaultMsg = joinLoopFaultMessages(loop.Faults)
-				loop.FaultCode = joinLoopFaultCodes(loop.Faults)
+				if idx < scanLoopCount {
+					loop.Faults = m9z.BuildLoopFaults(uint(idx+1), parametersRead.AlarmStatus, parametersRead.AlarmCode)
+					loop.HasFault = len(loop.Faults) > 0
+					loop.FaultMsg = joinLoopFaultMessages(loop.Faults)
+					loop.FaultCode = joinLoopFaultCodes(loop.Faults)
+				}
 			}
 			loops[idx] = loop
 		}()
@@ -191,7 +194,7 @@ func getDeviceStatus2Real(rpc towgo.JsonRpcConnection) {
 		return d.Loops[i].Index < d.Loops[j].Index
 	})
 	for _, loop := range d.Loops {
-		if loop.HasFault {
+		if loop.HasFault && loop.Index < scanLoopCount {
 			recordLoopFaults(cuid, uint(loop.Index+1), loop.V, loop.Faults)
 		}
 	}
@@ -200,14 +203,15 @@ func getDeviceStatus2Real(rpc towgo.JsonRpcConnection) {
 }
 
 func buildDemoDeviceStatus2() *DeviceStatus {
-	const loopCount = 10
+	displayLoopCount := monitorDisplayLoopCount()
+	scanLoopCount := configuredLoopCount()
 	d := &DeviceStatus{
-		ScanDeviceCount: loopCount,
-		Loops:           make([]DeviceStatusLoop, loopCount),
+		ScanDeviceCount: scanLoopCount,
+		Loops:           make([]DeviceStatusLoop, displayLoopCount),
 	}
 	d.Mode = 0
 	d.DeviceTime = time.Now().UTC()
-	for i := 0; i < loopCount; i++ {
+	for i := 0; i < displayLoopCount; i++ {
 		relayOpen := i%2 == 0
 		pwm := uint8(35 + i*5)
 		d.Relays[i] = relayOpen
@@ -226,17 +230,19 @@ func buildDemoDeviceStatus2() *DeviceStatus {
 		kw := float64(loop.V*loop.A) / 1000
 		loop.Kw = float32(math.Round(kw*1000) / 1000)
 
-		switch i {
-		case 0:
-			loop.Faults = m9z.BuildLoopFaults(uint(i+1), 0x01, "01 00")
-		case 1:
-			loop.Faults = m9z.BuildLoopFaults(uint(i+1), 0x02, "02 00")
-		case 6:
-			loop.Faults = m9z.BuildLoopFaults(uint(i+1), 0x04, "04 03")
-		case 8:
-			loop.Faults = m9z.BuildLoopFaults(uint(i+1), 0x03, "03 00")
-		default:
-			loop.Faults = m9z.BuildLoopFaults(uint(i+1), 0x02, "02 00")
+		if i < scanLoopCount {
+			switch i {
+			case 0:
+				loop.Faults = m9z.BuildLoopFaults(uint(i+1), 0x01, "01 00")
+			case 1:
+				loop.Faults = m9z.BuildLoopFaults(uint(i+1), 0x02, "02 00")
+			case 6:
+				loop.Faults = m9z.BuildLoopFaults(uint(i+1), 0x04, "04 03")
+			case 8:
+				loop.Faults = m9z.BuildLoopFaults(uint(i+1), 0x03, "03 00")
+			default:
+				loop.Faults = m9z.BuildLoopFaults(uint(i+1), 0x02, "02 00")
+			}
 		}
 		loop.HasFault = len(loop.Faults) > 0
 		loop.FaultMsg = joinLoopFaultMessages(loop.Faults)
diff --git a/internal/module/m9zTtyApi/scan.go b/internal/module/m9zTtyApi/scan.go
index 26077a6..91c94a0 100644
--- a/internal/module/m9zTtyApi/scan.go
+++ b/internal/module/m9zTtyApi/scan.go
@@ -9,6 +9,10 @@ func configuredLoopCount() int {
 	return scanConfigManager.GetLoopCount()
 }
 
+func monitorDisplayLoopCount() int {
+	return maxLoopCount
+}
+
 func normalizeLoopCount(loopCount int) int {
 	if loopCount <= 0 {
 		return defaultLoopCount
diff --git a/internal/module/m9zTtyApi/scan_test.go b/internal/module/m9zTtyApi/scan_test.go
index 58992d3..c32c8ba 100644
--- a/internal/module/m9zTtyApi/scan_test.go
+++ b/internal/module/m9zTtyApi/scan_test.go
@@ -22,3 +22,35 @@ func TestNormalizeLoopCount(t *testing.T) {
 		})
 	}
 }
+
+func TestMonitorDisplayLoopCountAlwaysUsesMaxLoopCount(t *testing.T) {
+	if got := monitorDisplayLoopCount(); got != maxLoopCount {
+		t.Fatalf("monitorDisplayLoopCount() = %d, want %d", got, maxLoopCount)
+	}
+}
+
+func TestBuildDemoDeviceStatus2KeepsDisplayLoopsIndependentFromScanCount(t *testing.T) {
+	scanConfigManager.mu.Lock()
+	oldLoopCount := scanConfigManager.loopCount
+	scanConfigManager.loopCount = 6
+	scanConfigManager.mu.Unlock()
+	t.Cleanup(func() {
+		scanConfigManager.mu.Lock()
+		scanConfigManager.loopCount = oldLoopCount
+		scanConfigManager.mu.Unlock()
+	})
+
+	status := buildDemoDeviceStatus2()
+	if got := len(status.Loops); got != monitorDisplayLoopCount() {
+		t.Fatalf("len(status.Loops) = %d, want %d", got, monitorDisplayLoopCount())
+	}
+	if got := status.ScanDeviceCount; got != 6 {
+		t.Fatalf("status.ScanDeviceCount = %d, want 6", got)
+	}
+	if !status.Loops[5].HasFault {
+		t.Fatal("status.Loops[5].HasFault = false, want true for the last scanned loop")
+	}
+	if status.Loops[6].HasFault {
+		t.Fatal("status.Loops[6].HasFault = true, want false outside the scan loop count")
+	}
+}