diff --git a/fsfw b/fsfw
index aded4fae..a11d7455 160000
--- a/fsfw
+++ b/fsfw
@@ -1 +1 @@
-Subproject commit aded4fae1e4f8a8a325c49b8c0d4bb4d7408d676
+Subproject commit a11d7455dfaf2e736f73f6c4dda1f8c06b9f1234
diff --git a/linux/devices/GPSHyperionLinuxController.cpp b/linux/devices/GPSHyperionLinuxController.cpp
index 02df197c..f1de53e9 100644
--- a/linux/devices/GPSHyperionLinuxController.cpp
+++ b/linux/devices/GPSHyperionLinuxController.cpp
@@ -81,11 +81,9 @@ ReturnValue_t GPSHyperionLinuxController::initializeLocalDataPool(
   localDataPoolMap.emplace(GpsHyperion::SATS_IN_USE, new PoolEntry<uint8_t>());
   localDataPoolMap.emplace(GpsHyperion::SATS_IN_VIEW, new PoolEntry<uint8_t>());
   localDataPoolMap.emplace(GpsHyperion::FIX_MODE, new PoolEntry<uint8_t>());
-  bool enablePeriodicHk = false;
 #if OBSW_ENABLE_PERIODIC_HK == 1
-  enablePeriodicHk = true;
+  poolManager.subscribeForPeriodicPacket(gpsSet.getSid(), true, 2.0, false);
 #endif
-  poolManager.subscribeForPeriodicPacket(gpsSet.getSid(), enablePeriodicHk, 2.0, false);
   return HasReturnvaluesIF::RETURN_OK;
 }
 
diff --git a/linux/fsfwconfig/pollingsequence/pollingSequenceFactory.cpp b/linux/fsfwconfig/pollingsequence/pollingSequenceFactory.cpp
index fdd4897e..0f9232e0 100644
--- a/linux/fsfwconfig/pollingsequence/pollingSequenceFactory.cpp
+++ b/linux/fsfwconfig/pollingsequence/pollingSequenceFactory.cpp
@@ -177,14 +177,7 @@ ReturnValue_t pst::pstSpi(FixedTimeslotTaskIF *thisSequence) {
   bool addSus9 = true;
   bool addSus10 = true;
   bool addSus11 = true;
-  /**
-   * The sun sensor will be shutdown as soon as the chip select is pulled high. Thus all
-   * requests to a sun sensor must be performed consecutively. Another reason for calling multiple
-   * device handler cycles is that the ADC conversions take some time. Thus first the ADC
-   * conversions are initiated and in a next step the results can be read from the internal FIFO.
-   * One sun sensor communication sequence also blocks the SPI bus. So other devices can not be
-   * inserted between the device handler cycles of one SUS.
-   */
+
   if (addSus0) {
     /* Write setup */
     thisSequence->addSlot(objects::SUS_0, length * 0, DeviceHandlerIF::PERFORM_OPERATION);
diff --git a/mission/devices/PayloadPcduHandler.cpp b/mission/devices/PayloadPcduHandler.cpp
index 7a1924c1..621b7d9e 100644
--- a/mission/devices/PayloadPcduHandler.cpp
+++ b/mission/devices/PayloadPcduHandler.cpp
@@ -51,6 +51,7 @@ void PayloadPcduHandler::doShutDown() {
   auto opCode = pwrStateMachine.fsm();
   if (opCode == power::OpCodes::TO_OFF_DONE or opCode == power::OpCodes::TIMEOUT_OCCURED) {
     pwrStateMachine.reset();
+    state = States::PL_PCDU_OFF;
     // No need to set mode _MODE_POWER_DOWN, power switching was already handled
     setMode(MODE_OFF);
   }
@@ -66,7 +67,8 @@ void PayloadPcduHandler::doTransition(Mode_t modeFrom, Submode_t subModeFrom) {
 
 ReturnValue_t PayloadPcduHandler::stateMachineToNormal(Mode_t modeFrom, Submode_t subModeFrom) {
   using namespace plpcdu;
-  if (submode == NormalSubmodes::SOLID_STATE_RELAYS_ADC_ON) {
+  bool doFinish = true;
+  if (((submode >> SOLID_STATE_RELAYS_ADC_ON) & 0b1) == 1) {
     if (state == States::PL_PCDU_OFF) {
       sif::error << "PayloadPcduHandler::stateMachineToNormal: Unexpected state PL_PCDU_OFF"
                  << "detected" << std::endl;
@@ -82,22 +84,24 @@ ReturnValue_t PayloadPcduHandler::stateMachineToNormal(Mode_t modeFrom, Submode_
       gpioIF->pullHigh(gpioIds::PLPCDU_ENB_VBAT1);
       state = States::ON_TRANS_SSR;
       transitionOk = true;
+      doFinish = false;
     }
     if (state == States::ON_TRANS_SSR) {
       // If necessary, check whether a certain amount of time has elapsed
       if (transitionOk) {
         transitionOk = false;
         state = States::ON_TRANS_ADC_CLOSE_ZERO;
-
         adcCountdown.setTimeout(50);
         adcCountdown.resetTimer();
         adcState = AdcStates::BOOT_DELAY;
+        doFinish = false;
         // If the values are not close to zero, we should not allow transition
         monMode = MonitoringMode::CLOSE_TO_ZERO;
       }
     }
     if (state == States::ON_TRANS_ADC_CLOSE_ZERO) {
       if (adcState == AdcStates::BOOT_DELAY) {
+        doFinish = false;
         if (adcCountdown.hasTimedOut()) {
           adcState = AdcStates::SEND_SETUP;
           adcCmdExecuted = false;
@@ -106,68 +110,38 @@ ReturnValue_t PayloadPcduHandler::stateMachineToNormal(Mode_t modeFrom, Submode_
       if (adcState == AdcStates::SEND_SETUP) {
         if (adcCmdExecuted) {
           adcState = AdcStates::NORMAL;
+          doFinish = true;
           adcCountdown.setTimeout(100);
           adcCountdown.resetTimer();
           adcCmdExecuted = false;
-          setMode(MODE_NORMAL, submode);
-          return HasReturnvaluesIF::RETURN_OK;
         }
       }
     }
   }
 
-  if (submode == NormalSubmodes::DRO_ON) {
+  auto switchHandler = [&](NormalSubmodeBits bit, gpioId_t id, std::string info) {
+    if (((diffMask >> bit) & 1) == 1) {
+      if (((submode >> bit) & 1) == 1) {
 #if OBSW_VERBOSE_LEVEL >= 1
-    sif::info << "Enabling PL PCDU DRO module" << std::endl;
+        sif::info << "Enabling PL PCDU " << info << " module" << std::endl;
 #endif
-    // Switch on DRO and start monitoring for negative voltages
-    gpioIF->pullHigh(gpioIds::PLPCDU_ENB_DRO);
-    adcCountdown.setTimeout(100);
-    adcCountdown.resetTimer();
-    setMode(MODE_NORMAL, submode);
-  }
+        // Switch on DRO and start monitoring for negative voltages
+        updateSwitchGpio(id, gpio::Levels::HIGH);
+      } else {
+#if OBSW_VERBOSE_LEVEL >= 1
+        sif::info << "Disabling PL PCDU " << info << " module" << std::endl;
+#endif
+        updateSwitchGpio(id, gpio::Levels::LOW);
+      }
+    }
+  };
 
-  if (submode == NormalSubmodes::X8_ON) {
-#if OBSW_VERBOSE_LEVEL >= 1
-    sif::info << "Enabling PL PCDU X8 module" << std::endl;
-#endif
-    // Switch on DRO and start monitoring for negative voltages
-    gpioIF->pullHigh(gpioIds::PLPCDU_ENB_X8);
-    adcCountdown.setTimeout(100);
-    adcCountdown.resetTimer();
-    setMode(MODE_NORMAL, submode);
-  }
-
-  if (submode == NormalSubmodes::TX_ON) {
-#if OBSW_VERBOSE_LEVEL >= 1
-    sif::info << "Enabling PL PCDU TX module" << std::endl;
-#endif
-    // Switch on DRO and start monitoring for negative voltages
-    gpioIF->pullHigh(gpioIds::PLPCDU_ENB_TX);
-    adcCountdown.setTimeout(100);
-    adcCountdown.resetTimer();
-    setMode(MODE_NORMAL, submode);
-  }
-
-  if (submode == NormalSubmodes::MPA_ON) {
-#if OBSW_VERBOSE_LEVEL >= 1
-    sif::info << "Enabling PL PCDU MPA module" << std::endl;
-#endif
-    // Switch on DRO and start monitoring for negative voltages
-    gpioIF->pullHigh(gpioIds::PLPCDU_ENB_MPA);
-    adcCountdown.setTimeout(100);
-    adcCountdown.resetTimer();
-    setMode(MODE_NORMAL, submode);
-  }
-
-  if (submode == NormalSubmodes::HPA_ON) {
-#if OBSW_VERBOSE_LEVEL >= 1
-    sif::info << "Enabling PL PCDU HPA module" << std::endl;
-#endif
-    // Switch on DRO and start monitoring for negative voltages
-    gpioIF->pullHigh(gpioIds::PLPCDU_ENB_HPA);
-    adcCountdown.setTimeout(100);
-    adcCountdown.resetTimer();
+  switchHandler(DRO_ON, gpioIds::PLPCDU_ENB_DRO, "DRO");
+  switchHandler(X8_ON, gpioIds::PLPCDU_ENB_X8, "X8");
+  switchHandler(TX_ON, gpioIds::PLPCDU_ENB_TX, "TX");
+  switchHandler(MPA_ON, gpioIds::PLPCDU_ENB_MPA, "MPA");
+  switchHandler(HPA_ON, gpioIds::PLPCDU_ENB_HPA, "HPA");
+  if (doFinish) {
     setMode(MODE_NORMAL, submode);
   }
   return RETURN_OK;
@@ -201,6 +175,16 @@ ReturnValue_t PayloadPcduHandler::buildTransitionDeviceCommand(DeviceCommandId_t
   return NOTHING_TO_SEND;
 }
 
+void PayloadPcduHandler::updateSwitchGpio(gpioId_t id, gpio::Levels level) {
+  if (level == gpio::Levels::HIGH) {
+    gpioIF->pullHigh(id);
+  } else {
+    gpioIF->pullLow(id);
+  }
+  adcCountdown.setTimeout(100);
+  adcCountdown.resetTimer();
+}
+
 void PayloadPcduHandler::fillCommandAndReplyMap() {
   insertInCommandAndReplyMap(plpcdu::READ_CMD, 2, &adcSet);
   insertInCommandAndReplyMap(plpcdu::READ_TEMP_EXT, 1, &adcSet);
@@ -548,25 +532,33 @@ bool PayloadPcduHandler::checkCurrent(float val, float upperBound, Event event)
 ReturnValue_t PayloadPcduHandler::isModeCombinationValid(Mode_t mode, Submode_t submode) {
   using namespace plpcdu;
   if (mode == MODE_NORMAL) {
+    diffMask = submode ^ this->submode;
     // Also deals with the case where the mode is MODE_ON, submode should be 0 here
-    if (submode == NormalSubmodes::SOLID_STATE_RELAYS_ADC_ON and
-        (this->mode == MODE_NORMAL and this->submode != NormalSubmodes::ALL_OFF)) {
+    if ((((submode >> SOLID_STATE_RELAYS_ADC_ON) & 0b1) == SOLID_STATE_RELAYS_ADC_ON) and
+        (this->mode == MODE_NORMAL and this->submode != ALL_OFF_SUBMODE)) {
       return TRANS_NOT_ALLOWED;
     }
-    if ((submode == NormalSubmodes::DRO_ON and
-         this->submode != NormalSubmodes::SOLID_STATE_RELAYS_ADC_ON)) {
+    if (((((submode >> DRO_ON) & 1) == 1) and
+         ((this->submode & 0b1) != (1 << SOLID_STATE_RELAYS_ADC_ON)))) {
       return TRANS_NOT_ALLOWED;
     }
-    if ((submode == NormalSubmodes::X8_ON and this->submode != NormalSubmodes::DRO_ON)) {
+    if ((((submode >> X8_ON) & 1) == 1) and
+        ((this->submode & 0b11) != ((1 << SOLID_STATE_RELAYS_ADC_ON) | (1 << DRO_ON)))) {
       return TRANS_NOT_ALLOWED;
     }
-    if ((submode == NormalSubmodes::TX_ON and this->submode != NormalSubmodes::X8_ON)) {
+    if (((((submode >> TX_ON) & 1) == 1) and
+         ((this->submode & 0b111) !=
+          ((1 << X8_ON) | (1 << DRO_ON) | (1 << SOLID_STATE_RELAYS_ADC_ON))))) {
       return TRANS_NOT_ALLOWED;
     }
-    if ((submode == NormalSubmodes::MPA_ON and this->submode != NormalSubmodes::TX_ON)) {
+    if ((((submode >> MPA_ON) & 1) == 1 and
+         ((this->submode & 0b1111) !=
+          ((1 << TX_ON) | (1 << X8_ON) | (1 << DRO_ON) | (1 << SOLID_STATE_RELAYS_ADC_ON))))) {
       return TRANS_NOT_ALLOWED;
     }
-    if ((submode == NormalSubmodes::HPA_ON and this->submode != NormalSubmodes::MPA_ON)) {
+    if ((((submode >> HPA_ON) & 1) == 1 and
+         ((this->submode & 0b11111) != ((1 << MPA_ON) | (1 << TX_ON) | (1 << X8_ON) |
+                                        (1 << DRO_ON) | (1 << SOLID_STATE_RELAYS_ADC_ON))))) {
       return TRANS_NOT_ALLOWED;
     }
     return HasReturnvaluesIF::RETURN_OK;
diff --git a/mission/devices/PayloadPcduHandler.h b/mission/devices/PayloadPcduHandler.h
index 18311ec8..dba5b4ef 100644
--- a/mission/devices/PayloadPcduHandler.h
+++ b/mission/devices/PayloadPcduHandler.h
@@ -134,6 +134,7 @@ class PayloadPcduHandler : public DeviceHandlerBase {
   SdCardMountedIF* sdcMan;
   plpcdu::PlPcduParameter params;
   bool quickTransitionAlreadyCalled = true;
+  uint8_t diffMask = 0;
 
   PoolEntry<uint16_t> channelValues = PoolEntry<uint16_t>({0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0});
   PoolEntry<float> processedValues =
@@ -141,6 +142,8 @@ class PayloadPcduHandler : public DeviceHandlerBase {
   PoolEntry<float> tempC = PoolEntry<float>({0.0});
   DualLanePowerStateMachine pwrStateMachine;
 
+  void updateSwitchGpio(gpioId_t id, gpio::Levels level);
+
   void doTransition(Mode_t modeFrom, Submode_t subModeFrom) override;
   void doStartUp() override;
   void doShutDown() override;
diff --git a/mission/devices/devicedefinitions/payloadPcduDefinitions.h b/mission/devices/devicedefinitions/payloadPcduDefinitions.h
index 3013cb82..ab387fc7 100644
--- a/mission/devices/devicedefinitions/payloadPcduDefinitions.h
+++ b/mission/devices/devicedefinitions/payloadPcduDefinitions.h
@@ -91,16 +91,17 @@ static constexpr DeviceCommandId_t SETUP_CMD = 1;
 static constexpr DeviceCommandId_t READ_TEMP_EXT = 2;
 static constexpr DeviceCommandId_t READ_WITH_TEMP_EXT = 3;
 
-enum NormalSubmodes {
-  ALL_OFF = 0,
-  SOLID_STATE_RELAYS_ADC_ON = 1,
-  DRO_ON = 2,
-  X8_ON = 3,
-  TX_ON = 4,
-  MPA_ON = 5,
-  HPA_ON = 6
+enum NormalSubmodeBits {
+  SOLID_STATE_RELAYS_ADC_ON = 0,
+  DRO_ON = 1,
+  X8_ON = 2,
+  TX_ON = 3,
+  MPA_ON = 4,
+  HPA_ON = 5
 };
 
+static constexpr Submode_t ALL_OFF_SUBMODE = 0;
+
 // 12 ADC values * 2 + trailing zero
 static constexpr size_t ADC_REPLY_SIZE = 25;
 // Conversion byte + 24 * zero