Bradley Smoker PLC-5 user manual File Instructions, Btd, Fal, Fsc

Instruction Set Quick Reference D-17

Instruction Description

BTD

BIT FIELD DISTRIB

Source	N7:3
	0
Source bit	3
Dest	N7:4
Dest bit	0
	10
Length	6

Bit Distribute	When the input conditions are true, the controller copies the
BTD	number of bits specified by Length, starting with the Source bit
	(3) of the Source (N7:3), and placing the values in the
	Destination (N7:4), starting with the Destination bit (10).

File Instructions

Instruction					Description
				File Arithmetic and	When the input conditions go from false-to-true, the
		FAL
				Logic	controller reads 8 elements of N14:0, and subtracts 256 (a
		FILE ARITH/LOGICAL		FAL	constant) from each element. This example shows the
		Control	R6:1		result being stored in the eight elements beginning with
				Status Bits:	N15:10. The control element R6:1 controls the operation.
		Length	8
		Position	0	EN - Enable	The Mode determines whether the controller performs the
		Mode	ALL	DN - Done Bit	expression on all elements in the files (ALL) per program
		Dest	#N15:10	ER - Error Bit	scan, one element in the files (INC) per false-to-true
		Expression	#N14:0 - 256		transition, or a specific number of elements (NUM) per
					scan.
					The FAL instruction can perform these operations: add (+),
					subtract (-), multiply (*), divide (), convert from BCD (FRD),
					convert to BCD (TOD), square root (SQR), logical and (AND),
					logical or (OR), logical not (NOT), exclusive or (XOR), negate
					(-), clear (0), move, and the new math instructions (see the
					CPT list).
				File Search and	When the input conditions go from false-to-true, the
	FSC
	FILE SEARCH/COMPARE			Compare	controller performs the not-equal-to comparison on 10
				FSC	elements between files B4:0 and B5:0. Mode determines
	Control		R9:0
					whether the controller performs the expression on all
	Length		90	Status Bits:	elements in the files (ALL) per program scan, one element in
	Position		0	EN - Enable	the files (INC) per false-to-true transition, or a specific
	Mode		10	DN - Done Bit	number of elements (NUM) per scan. Control element R9:0
	Expression		#B4:0 <> #B5:0
				ER - Error Bit	controls the operation.
				IN - Inhibit Bit
				FD - Found Bit	When the corresponding source elements are not equal
					(element B4:4 and B5:4 in this example), the controller
					stops the search and sets the found .FD and inhibit .IN bits

so your ladder program can take appropriate action. To continue the search comparison, you must reset the .IN bit.

To see a list of the available comparisons, see the comparisons listed under the CMP instruction.

Publication 1785-UM012D-EN-P - July 2005