Modbus alarm handling

A short step-by-step tutorial for creating an alarm list like in BEST

Read out the number of alarms 1600 (I).
0 --> No alarm
>0 --> Number of alarms
Depending on the number of alarms, read out the register 1604 (I) .. 1619 (I).

Bit 0 .. 9 provides the index number of the alarms which are listed in the BEST Software under "Product" --> "Documentation" --> "Alarms"
Bit 10 .. 12 provides the alarm severity
Bit 15 provides the alarm state

Overview of the relevant Modbus registers

Register	Name	Description	Type
1600 (I)	Active and inactive alarms	Number of active and inactive alarms	uint16
1601 (I)	Active alarms	Number of active alarms	uint16
1602 (I)	Highest alarm state	Highest state of any listed alarm 0 = None 4 = Warning 5 = Critical	uint16
1603 (H)	Alarm reset	Alarm reset command 65535 = Reset all resettable alarms	uint16
1604 (I) .. 1619 (I)	Alarm 1 .. 16	Alarms are ranked in the alarm list according to severity: alarm 1 is highest ranking, alarm 16 is lowest ranking. Bit 0 .. 9 (binary to decimal): Index number, see in the BEST Software under "Product" --> "Documentation" --> "Alarms" for the translation of index numbers into alarm texts. The table can be exported as csv file via the "Export..." button in the top menu all the way to the right. Bit 10 .. 12 (binary to decimal): Alarm severity 3 = Warning 4 = Critical Bit 13 .. 14: Reserved Bit 15 (binary to decimal): Alarm state 1 = Inactive 2 = Active	uint16

Alarm severity types

There are the following alarm severity types:

Critical :
The definition of a critical alarm for the ECOSTAR differs from those for other IQ products!
If a critical alarm condition is detected, the device will open the relays for the motor contacts and stop the compressor motor.

Warning :
A warning is signalled when a condition occurs which may require attention but is not severe enough to stop operation of the compressor. The compressor keeps running.