Bradley Smoker PLC-5 user manual Shift Register Instructions, Bsl, Bsr, Ffl, Ffu

D-20Instruction Set Quick Reference

Shift Register Instructions

Instruction Description

BSL

BIT SHIFT LEFT

File	#B3:1
Control	R6:53
Bit Address	I:022/12
Length	5

Bit Shift Left	If the input conditions go from false-to-true, the BSL instruction
BSL	shifts the number of bits specified by Length (5) in File (B3),
	starting at bit 16 (B3:1/0 = B3/16), to the left by one bit position.
Status Bits:	The source bit (I:022/12) shifts into the first bit position, B3:1/0
EN - Enable	(B3/16). The fifth bit, B3:1/4 (B3/20), is shifted into the UL bit of
DN - Done Bit	the control structure (R6:53).
ER - Error Bit
UL - Unload Bit

BSR

BIT SHIFT RIGHT

File	#B3:2
Control	R6:54
Bit Address	I:023/06
Length	3

Bit Shift Right	If the input conditions go from false-to-true, the BSR instruction
BSR	shifts the number of bits specified by Length (3) in File (B3),
	starting with B3:2/0 (=B3/32), to the right by one bit position.
Status Bits:	The source bit (I:023/06) shifts into the third bit position B3/34.
EN - Enable	The first bit (B3/32) is shifted into the UL bit of the control
DN - Done Bit	element (R6:54).
ER - Error Bit
UL - Unload Bit

FFL		FIFO Load	When the input conditions go from false-to-true, the controller
		FFL	loads N60:1 into the next available element in the FIFO file,
FIFO LOAD
			#N60:3, as pointed to by R6:51. Each time the rung goes from
Source	N60:1
		Status Bits:	false-to-true, the controller loads another element. When the
FIFO	#N60:3	EN - Enable Load	FIFO file (stack) is full, (64 words loaded), the DN bit is set.
Control	R6:51	DN - Done Bit
Length	64
		EM - Empty Bit	See page F-8 for a description of prescan activities for
Position	0
			this instruction.
		FIFO Unload	When the input conditions go from false-to-true, the controller
FFU
FIFO UNLOAD		FFU	unloads an element from #N60:3 into N60:2. Each time the rung
			goes from false-to-true, the controller unloads another value.
FIFO	#N60:3
		Status Bits:	All the data in file #N60:3 is shifted one position toward N60:3.
Dest	N60:2	EU - Enable Unload	When the file is empty, the EM bit is set.
Control	R6:51	DN - Done Bit
Length	64
		EM - Empty Bit	See page F-8 for a description of prescan activities for this
Position	0
			instruction.

Publication 1785-UM012D-EN-P - July 2005