DAIKIN_EKMBDXB7V1_IDU_FC16_2000_2143

DAIKIN_EKMBDXB7V1_IDU_FC16_2000_2143 (FB)

FUNCTION_BLOCK DAIKIN_EKMBDXB7V1_IDU_FC16_2000_2143

Representation

Short description

Change of setpoints - 1 of up to 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 transmission rates are supported: 9600 and 19200 bit/s. For addressing, use the address specifications, not the register addresses (address = register - 1). The 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!!! Taking the tested transmission parameters into account, the time between the end of the response telegram and the next request telegram must be at least 22.5 ms

All registers read with FC04 are always available with current values. All registers read with FC03 are only available with current values once during each restart of the gateway

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In this FB, the relevant setpoints of all up to 48 indoor units are captured and transferred (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 available (input arxIndoorUnits_ReadWriteState).

Procedure for changing a setpoint (FC06 or FC16) (see DAIKIN documentation !!!)

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

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

InOut:

Scope	Name	Type	Initial	Comment
Input	xEn	BOOL	TRUE	Enable / disable communication (TRUE = enable)
Input	byUnitId	BYTE	0	Address of the device (interface) (1 .. 15)
Input	xUpdateSetp	BOOL	FALSE	Update of setpoints (on every rising edge )
Input	xCheckChanges	BOOL	FALSE	Detection of changes in the array arstIndoorUnits_Setpoint_Values_1_IN (with every rising edge)
Input	xResError	BOOL	FALSE	Reinitialization of the output eErrorCodeCom (with every 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: number of the indoor unit 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: number of the indoor unit Array element = structure with the setpoints
Input	xResFilterSign	BOOL	FALSE	Input for resetting the filter maintenance indication on all indoor units (TRUE = reset)
Inout	ModbusClient	ModbusClientBase		Client of the device
Output	xAlarm	BOOL	FALSE	Collective fault (TRUE = fault)
Output	xAlarmCom	BOOL	FALSE	Collective 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 processes influenced by the input xCheckChanges influenced
Input Const	tTimeUpdateSetp	TIME	TIME#45s0ms	Update interval for the processes influenced by the input xUpdateSetp influenced