BAC_AC_MixAT_01

Application

The call template BAC_AC_MixAT_01 is used to control and regulate a mixed air system.
The template BAC_AC_MixAT_01 is a call template.
Within the template the following subtemplates are called and linked with each other.

MixAT_PID: supply air temperature controller
DmpMixA: mixed air damper
DmpOuA: outside air damper
DmpExhA: exhaust air damper

Interface

BAC_AC_MixAT_01 1:

Plant diagram 01

Plant diagram 02

Block diagram

VAR_INPUT

rSuAT        : REAL;
rSp          : REAL;
udiPltStp    : UDINT;
udiOpMod     : UDINT;
rExtAT       : REAL;
bWthTLmtCrit : BOOL;

rSuAT: Measured value of the supply air temperature

rSp: Set value for the supply air temperature

udiPltStp: Plant start sequence steps. The plant steps are generated in the system start programBAC_AC_StartT_01.

udiOpMod: Plant operation mode. The plant operation mode is determined in the mode selection programBAC_AC_OpMod_01.

rExtAT: Measured value outlet air temperature.

bWthTLmtCrit: Signal from system start program. Starting in recirculated-air mode via start-up ramp.

VAR_OUTPUT

bAvail      : BOOL;

bAvail: This output indicates that a mixed-air damper system is present. This variable notifies the system start program that prerinsing of the preheater is skipped, see BAC_AC_StartT_01.
On startup of the ventilation system, the ramp function in the template MixAT_PID replaces prerinsing of the air heater.

Program description

Instance	Type	Task
PID	BAC_AC_MixAT_PID_01	Subtemplate including PID sequence controller for supply air temperature control.
DmpMixA	BAC_Uni_Dmp_01_05	Subtemplate recirculating air damper
DmpOuA	BAC_Uni_Dmp_01_05	Subtemplate outside air damper
DmpExhA	BAC_Uni_Dmp_01_05	Subtemplate exhaust air damper
Inv	FB_BA_Chrct02	Inversion of the control signal of the outside air damper for controlling the mixed air damper.
OpModPgm	FB_BA_MMUX_R04	The multiplexer defines the control value for the dampers in the program priority (automatic operation) via the plant operation mode udiOpMod
		udiOpMod				Value
		OPMOD_AC_MANON	Manual on			Pgm_rY	Pgm_rY is a variable, which relays the result of the MIN selection of the mixed air damper controller and the ramp function to the dampers.
		OPMOD_AC_AC_ON	Automatic mode on			Pgm_rY	Pgm_rY is a variable, which relays the result of the MIN selection of the mixed air damper controller and the ramp function to the dampers.
		OPMOD_AC_NGTCOL	Night cooling			100
		OPMOD_AC_COLDWNPRTC	Cooling protection			0
		OPMOD_AC_OVRHTGPRTC	Overheating protection			0
OpModSftyMix	FB_BA_MMUX_R04	The multiplexer defines the safety priority for the recirculating air damper via the plant operation mode udiOpMod
		udiOpMod						Value
		OPMOD_AC_SMEXTTPRG		Smoke extraction program				0
		OPMOD_AC_SMEXTTSUA		Smoke extraction supply air				0
		OPMOD_AC_SMEXTTEXHA		Smoke extraction exhaust air				0
		OPMOD_AC_FIRE		Fire				0
OpModDistMix	FB_BA_MMUX_R04	The multiplexer defines the fault priority for the recirculating air damper via the plant operation mode udiOpMod
		udiOpMod						Value
		OPMOD_AC_FORCVENT		Forced ventilation				0
		OPMOD_AC_EMERG		emergency				0
		OPMOD_AC_FRST		Frost				100
		OPMOD_AC_CENTSWIOFF		Central shutdown				0
		OPMOD_AC_ALM		Fault/alarm				100
OpModSftyOuA	FB_BA_MMUX_R04	The multiplexer defines the safety priority for the outside air damper via the plant operation mode udiOpMod
		udiOpMod						Value
		OPMOD_AC_SMEXTTPRG		Smoke extraction program				100
		OPMOD_AC_SMEXTTSUA		Smoke extraction supply air				100
		OPMOD_AC_SMEXTTEXHA		Smoke extraction exhaust air				0
		OPMOD_AC_FIRE		Fire				0
OpModDistOuA	FB_BA_MMUX_R04	The multiplexer defines the fault priority for the outside air damper via the plant operation mode udiOpMod
		udiOpMod						Value
		OPMOD_AC_FORCVENT		Forced ventilation				100
		OPMOD_AC_EMERG		emergency				0
		OPMOD_AC_FRST		Frost				0
		OPMOD_AC_CENTSWIOFF		Central shutdown				0
		OPMOD_AC_ALM		Fault/alarm				0
OpModSftyExhA	FB_BA_MMUX_R04	The multiplexer defines the safety priority for the exhaust air damper via the plant operation mode udiOpMod
		udiOpMod							Value
		OPMOD_AC_SMEXTTPRG			Smoke extraction program				100
		OPMOD_AC_SMEXTTSUA			Smoke extraction supply air				0
		OPMOD_AC_SMEXTTEXHA			Smoke extraction exhaust air				100
		OPMOD_AC_FIRE			Fire				0
OpModDistExhA	FB_BA_MMUX_R04	The multiplexer defines the fault priority for the exhaust air damper via the plant operation mode udiOpMod
		udiOpMod						Value
		OPMOD_AC_FORCVENT		Forced ventilation				100
		OPMOD_AC_EMERG		emergency				0
		OPMOD_AC_FRST		Frost				0
		OPMOD_AC_CENTSWIOFF		Central shutdown				0
		OPMOD_AC_ALM		Fault/alarm				0

Version history

Version number	Comments
1.0.1	First release