SIEMENS SIMATIC S7 + WINCC

Grid Cleaning Control

Cleaning control of the Pin Hole grid is performed sequentially and continuously throughout the boiler operation.

• Create FB10 FB_LIMP_VV Cleaning Valve Function Block.

• Open FB10 for editing. In Component View, double-click on the function block.

• In Interface, enter the input parameters:

Name	Type	Description	S7_m_c
INICIA	Bool	Sequence start

• In Interface, enter the output parameters::

Name	Type	Description	S7_m_c
FINAL	Bool	Sequence final
VV_CA	Bool	Valve automatic command

• In Interface, enter the IN/OUT parameters:

Name	Type	Description	S7_m_c
SPTAVV	Int	SP Valve Opening Time
SPTIEVV	Int	SP Valve Interval Time

• In Interface, enter the STAT parameters:

Name	Type
TIMER1	TON
TIMER1_Q	Bool
TIMER2	TON
TIMER2_Q	Bool
BIT1	Bool
X1SPTAVV	DInt
X2SPTAVV	Time
X1SPTEVV	DInt
X2SPTEVV	Time

• Start valve cleaning sequence. Open valve in automatic.

• Open valve time count, defined in the STPAVV setpoint by the operator.

• After the time has elapsed, close the valve automatically and start an interval between valves.

• Counting of cleaning interval between valves, defined in the SPTIEVV setpoint by the operator.

• After the interval has elapsed, complete the valve cleaning sequence.

• Conversion of time from the SPTAVV setpoint from the whole type (in seconds, coming from the supervisory) to the Time type (in milliseconds).

• Time conversion of the SPTIEVV setpoint from the whole type (in seconds, coming from the supervisory) to the Time type (in milliseconds).

• Create FB11 CTR_LIMP_GRELHA Grid Cleaning Control Function Block.

• Open function block FB11 for editing. In Component View, double-click on the function block.

• In Interface, enter the input parameters:

Name	Type	Description	S7_m_c
SPILG	Int	SP interval between cleanings time	True
AM	Bool	Auto/Manual Grid cleaning control	True

• In Interface, enter the output parameters:

Name	Type	Description	S7_m_c
TDLG	Int	Elapsed Time Grid Cleaning Interval	True
LG_XV351OK	Bool	XV351 cleaning OK	True
LG_XV352OK	Bool	XV352 cleaning OK	True
LG_XV353OK	Bool	XV353 cleaning OK	True
LG_XV354OK	Bool	XV354 cleaning OK	True
LG_XV355OK	Bool	XV355 cleaning OK	True
LG_XV356OK	Bool	XV356 cleaning OK	True
LG_XV357OK	Bool	XV357 cleaning OK	True
LG_XV358OK	Bool	XV358 cleaning OK	True
LG_XV359OK	Bool	XV359 cleaning OK	True

• In Interface, enter the input/output parameters:

Name	Type	Description	S7_m_c
SPTAVV	Int	SP Valve Opening Time	True
SPTIEVV	Int	SP Valve Interval Time	True

• In Interface, enter the STAT parameters:

Name	Type
T1	TON
SPILGDINT1	DInt
SPILGDINT2	DInt
SPILGTIME	Time
TDLGTIME	Time
TDLGDINT1	DInt
TDLGDINT2	DInt
P1LG	Bool
X1LG	Bool
MBPSLG	Bool
PSLG	Bool

• Time conversion of the SPILG setpoint from the whole type (in minutes, coming from the supervisory) to the Time type (in milliseconds).

• Conversion of time elapsed between cleaning intervals, from the time type (in milliseconds) to the int type (sent to the supervisory).

• Interval time count between cleanings.

• After the interval between cleaning has elapsed, start cleaning the XV351 valve.

• After the cleaning sequence for the XV351 valve is finished, start cleaning the XV352 valve.

• After the cleaning sequence for the XV352 valve is finished, start cleaning the XV353 valve.

• After the cleaning sequence for the XV353 valve is finished, start cleaning the XV354 valve.

• After the cleaning sequence for the XV354 valve is finished, start cleaning the XV355 valve.

• After the cleaning sequence for the XV355 valve is finished, start cleaning the XV356 valve.

• After the cleaning sequence for the XV356 valve is finished, start cleaning the XV357 valve.

• After the cleaning sequence for the XV357 valve is finished, start cleaning the XV358 valve.

• After the cleaning sequence for the XV358 valve is finished, start cleaning the XV359 valve.

• After the cleaning sequence of the XV359 valve has finished, start counting the time interval between cleanings.

• Reset of the cleaning status of each valve.

• General reset when the grid cleaning control is in manual.

• Transition pulse with grid cleaning control going from manual to automatic.

• Change auto/manual mode of all valves to automatic, the instant the grid cleaning control goes to automatic. After this moment, the valve's auto/manual mode can be changed to manual by the operator, even with the grid cleaning control in automatic.

• Selection of auto/manual mode of the valves to manual when the grid cleaning control is in manual.

• With manual grid cleaning control, reset the automatic valve control.

• Function block instance FB_LIMP_VV for valve XV351. The VV_CA output activates the AC input parameter of the function block instance of the VV351 on-0ff valve.

LG_XV351

FB_LIMP_VV

DB62