PL7_REGISTER_32 : 32 word memory register

Description of the function

The PL7_REGISTER_32 function block is a memory register that can store up to 32 words (of the INT type).

There are two storage modes:

FIFO mode (first in, first out), also known as file,
LIFO mode (last in, first out), also known as pile.

The additional parameters and can be configured.

NOTE: you cannot instantiate or modify the PL7_REGISTER_32 function in online mode. This means you must be in offline mode and therefore you must transfer the project in the PLC.

NOTE: If you create more than 255 instances of PL7_REGISTER_32 the application cannot be transfered in the PLC.

FBD representation

Representation:

LD representation

Representation:

IL representation

Representation:

CAL R_1 (R := Raz, I := In_Pulse, O := Out_Pulse, E => Empty, F => Full)

ST representation

Representation:

IF Raz THEN

   RESET_PL7_REGISTER_32 (R_1) ;

END_IF ;

IF RE(In_Pulse) THEN

   GET_PL7_REGISTER_32 (R_1) ;

END_IF ;

IF RE(Out_Pulse) THEN

   PUT_PL7_REGISTER_32 (R_1) ;

END_IF ;

Empty := R_1.E ;

Full := R_1.F ;

Description of parameters

The following table describes the input parameters:

Parameter	Type	Comment
R	BOOL	Input of reset to zero, if R_1.R equals 1 the register is emptied.
I	BOOL	Storage input, on rising edge, the input word of the register is stored in the register.
O	BOOL	Destock input, on rising edge, the input word is written with the information ready to be destocked from the register.

The following table describes the output parameters:

Parameter	Type	Comment
E	BOOL	Empty register output. When the register is empty, it is no longer possible to destock information.
F	BOOL	Full register output. When the register is full, it is no longer possible to store information.

NOTE: when both inputs (store and destock) are activated simultaneously, storing is carried out before destocking.

Description of variables

The following table describes the public variables:

Parameter	Type	Comment
FIFO	BOOL	Mode of operation of the register: True : FIFO. False : LIFO (default).
IN W	INT	Input word of the register; it can be read, tested or written.
OUT W	INT	Output word of the register; it can be read, tested or written.
LEN	UINT	Number of words of the register.

Operating modes

The following table describes the specific modes of operation of the PL7_REGISTER_32 function:

Effect...	Description
of a cold restart	(%S0=1), causes the initialization of the contents of the register. The output bit indicating that the register is empty is set at 1.
of a warm restart	(%S1=1) has no effect on the content of the register or on the state of the output bits.
of a reset to zero	The effect of the reset to zero differs according to the language used : in LD and FBD, the input histories are updated with the cabled values, in IL, the input histories are not updated and each input retains the value it had prior to the call. in ST, the input histories are set to zero.