Error Messages - Helios KWL EC D Série Notice De Montage Et D'utilisation

Installation and Operation Instructions
EN
CHAPTER 2
KWL Modbus RS 485 – Communication protocol
Tab . 4 - Unit status – 2 Address 15013
LOW byte
Address 15013 Lb . 3 - Geräte-Status – 1 Adresse 15012
Bits
7 6 5 4 3
1
1
1
1
1
0 – not set
1 – set
x – no Status
2 .0

Error messages

If the KWL unit sends a message to the Master, it will expect feedback. Four situations can arise:
1. If the Master receives an error message without any problems and it can be processed normally, the KWL unit
will receive a confirmation with the same function code as the message.
2. If the Master does not receive a request due to a connection error, a response will not be returned. This means
that the KWL unit has not received any feedback within a defined time window.
3. If the Master receives a message, but discovers a communication error in it (parity, CRC...), no feedback will be
sent.
4. If the Master receives a message without any problems, but it cannot be processed, negative feedback will be
sent to the KWL unit, which will contain reason for the error.
Normal and negative feedbacks differ in the highest bit of the code. If the bit is ZERO, then it is a normal response
and if the bit is ONE, it concerns negative feedback. In case of negative feedback, an error code is specified in the data
area of the controller.
The following table contains a list of possible error codes:
MODBUS Error definitions
Code
Name
01 Invalid function
02 Invalid data address
03 Invalid values
04 Unit malfunction
05 Confirmation
06 The unit is busy
08 Memory parity error
0A Interface – Transfer unsuccessful
0B Interface – The target unit is not responding
1
2 0 Meaning
1 Sensor error - Frost protection sensor
1 Sensor error – Sensor WW return line
1 Frost protection Hot water heating register
Motor error outside air – Lack of motor feedback
Motor error extract air – Lack of motor feedback
Frost protection is active
Passive house protection active (unit temperature below +5 °C)
Calibration interrupted (frost protection alarm)
Meaning
The desired function is not supported
The specified address is outside the supported range
The data contains errors
An unrecoverable error has occurred
Feedback during programming. The Master confirms
receipt of a valid message, but the execution is taking
too long
Feedback during programming. The Master is busy with an
instruction which is taking too long
Feedback when working with files. a parity error occured
when reading the file.
Feedback when working with the interface. The interface
can verify the transmission path between the transmission
port and the receiving port. It may have been overloaded
or
Feedback when working with the interface. The target unit
is
4
incorrectly configured.
not responding, it may not exist.