Allen-Bradley MicroLogix 1400 Instruction Manual page 280

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278 File Instructions
FFL Instruction Valid Addressing Modes and File Types
For definitions of the terms used in this table see Using the Instruction Descriptions on page 92.
Parameter
Source • • •
FIFO • • •
Control
Length
Position
(1) See Important note about indirect addressing.
(2) Control file only. Not valid for Timers or Counters.
Publication 1766-RM001A-EN-P - October 2008
• 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 FIFO 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...128 (word) or 1...64 (long
word). The position is incremented after each load.
• Position - This is the current location pointed to in the FIFO 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...127 (word) or 0...63 (long
word).
Addressing Modes and File Types can be used as shown in the following
table:
Data Files
• • • •
• • •
(2)
You cannot use indirect addressing with: S, MG, PD, RTC, HSC, PTOX,
IMPORTANT
PWMX, STI, EII, BHI, MMI, CS, IOS, and DLS files.
13 12 11 10 9
(2) (3) not used
DN EM
Function Files
8 7 6 5 4 3 2 1
Address
Address Level
(1)
Mode
• • • • •
• • • •
•
• •
• •
0
•