DAIKIN_EKMBDXB7V1_IDU_FC16_2000_2143

DAIKIN_EKMBDXB7V1_IDU_FC16_2000_2143 (FB)

FUNCTION_BLOCK DAIKIN_EKMBDXB7V1_IDU_FC16_2000_2143

Short description

Change of setpoints - 1 of a maximum of 48 Daikin - indoor units Typical application: Central control of Daikin - indoor units via the Daikin Modbus - interface EKMBDXB7V1\

Guidelines - Software creation

The following function codes (FC) are supported: 3, 4, 6 and 16 The following baud rates are supported: 9600 and 19200 bit/s For addressing use the address values, not the register addresses (address = register - 1) Modbus addresses 1 - 15 can be set directly on the DIP switches in the interface. In FC03 a maximum of 32 registers may be requested in one request telegram (deviating from the Modbus standard) In FC04 a maximum of 32 registers may be requested in one request telegram (deviating from the Modbus standard) In FC16 a maximum of 30 registers may be written in one request telegram (deviating from the Modbus standard) The following transmission parameters were tested: 19200 baud, 8-N-1 The interface supports the following exception codes: 0x81, 0x82 and 0x83 The number of control commands per indoor unit is limited to 7000 / year !!! Considering the tested transmission parameters, the time interval between the end of the response and the next request telegram must be at least 22.5 ms All registers read with FC04 are always available up to date All registers read with FC03 are available up to date only once during each gateway restart &#xNAN;************** &#xNAN;* Functions * &#xNAN;************** This FB collects and transmits the relevant setpoints of all up to 48 indoor units (FC16: addresses 2000 - 2143) The setpoints are provided in the array ‘arstIndoorUnits_Setpoints_1_IN’ separately for each indoor unit as a structure element. The setpoints of an indoor unit are only updated if the corresponding write/read permission is present (input ‘arxIndoorUnits_ReadWriteState’). Procedure to change a setpoint (FC06 or FC16) (see DAIKIN documentation!!!) \

1. Detection of changes to the current setpoints (compare the array with the index ‘_IN’ with the array with the index ‘_OLD’ )\

When setpoint changes occur, the following additional steps are required: 2) Read current actual values (FC04: addresses 2000 - 2287) (stored in the array with the index ‘_CURRENT’) 3) Write current actual values as setpoints (FC16: addresses 2000 - 2143) (copy array with the index ‘_CURRENT’ into the array with the index ‘_OUT’) 4) Write current setpoints (FC16: addresses 2000 - 2143) (copy array with the index ‘_IN’ into the array with the index ‘_OUT’), (copy array with the index ‘_IN’ into the array with the index ‘_OUT’) \

InOut:

Scope	Name	Type	Initial	Comment
Input	xEn	BOOL	TRUE	Enable / disable communication ( TRUE = enabled )
Input	byUnitId	BYTE	0	Address of the device (interface) (1 .. 15)
Input	xUpdateSetp	BOOL	FALSE	Update of setpoint values (on every rising edge )
Input	xCheckChanges	BOOL	FALSE	Detection of changes in the array ‘arstIndoorUnits_Setpoint_Values_1_IN’ (on each rising edge)
Input	xResError	BOOL	FALSE	Reinitialization of the output 'eErrorCodeCom' (on each rising edge)
Input	arxIndoorUnits_ReadWriteState	ARRAY [1..4, 0..15] OF BOOL		Array with the read/write permissions of the indoor units of all groups (1-00 … 4-15) 1st dimension: group, 2nd dimension: indoor unit number Array element = FALSE: no read/write permission Array element = TRUE: read/write permission
Input	arstIndoorUnits_Setpoint_Values_1_IN	ARRAY [1..3, 0..15] OF EKMBDXB7V1_SETPOINT_VALUES_1		Array with the relevant setpoints of the indoor units of all groups (1-00 … 3-15) 1st dimension: group, 2nd dimension: indoor unit number Array element = structure with the setpoints
Input	xResFilterSign	BOOL	FALSE	Input to reset the filter maintenance indicator on all indoor units (TRUE = reset)
Inout	ModbusClient	ModbusClientBase		Client of the device
Output	xAlarm	BOOL	FALSE	General fault ( TRUE = fault )
Output	xAlarmCom	BOOL	FALSE	General fault - communication ( TRUE = fault )
Output	eErrorCodeCom	ModbusErrorCode		Error code - communication ( 0 = no error )
Output	xBusy	BOOL		Communication indicator ( TRUE = communication )
Input Const	xEnFanControl	BOOL	TRUE	General enable/disable of fan control for all 48 indoor units (TRUE = enable)
Input Const	tTimeCheckChanges	TIME	TIME#1s0ms	Update interval for the operations affected by the input ‘xCheckChanges’
Input Const	tTimeUpdateSetp	TIME	TIME#45s0ms	Update interval for operations influenced by the input 'xUpdateSetp'