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LFL Instruction Valid Addressing Modes and File Types
For definitions of the terms used in this table see Using the Instruction Descriptions on page 82.
Parameter
Source
•
•
•
LIFO
•
•
•
Control
Length
Position
(1) See Important note about indirect addressing.
(2) Control file only. Not valid for Timers and Counters.
• Control - This is a control file address. The status bits, stack length,
and the position value are stored in this element. The control
element consists of 3 words:
15
14
Word 0
(1)
--
EN
Word 1
Length - maximum number of words or long words in the stack.
Word 2
Position - the next available location where the instruction loads data.
(1) EN - Enable Bit is set on false-to-true transition of the rung and indicates the instruction is enabled.
(2) DN - Done Bit, when set, indicates that the stack is full.
(3) EM - Empty Bit, when set, indicates that LIFO is empty.
• Length - The length operand contains the number of elements in the
FIFO stack to receive the value or constant found in the source. The
length of the stack can range from 1 to 128 (word) or 1 to 64 (long
word). The position is incremented after each load.
• Position - This is the current location pointed to in the LIFO stack. It
determines the next location in the stack to receive the value or
constant found in source. Position is a component of the control
register. The position can range from 0 to 127 (word) or 0 to 63
(long word).
Addressing Modes and File Types can be used as shown in the following
table:
Data Files
•
•
•
•
•
•
•
(2)
IMPORTANT
13
12
11
10
(2)
(3)
not used
DN
EM
Function Files
You cannot use indirect addressing with: S, ST, MG, PD,
RTC, HSC, PTO, PWM, STI, EII, BHI, MMI, CS, IOS, and
DLS files.
File Instructions
9 8 7 6 5 4 3 2 1 0
Address
Address Level
(1)
Mode
•
•
•
•
•
•
•
•
•
•
•
•
Publication 1763-RM001C-EN-P - October 2009
235
•
•
•
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