Allen-Bradley MicroLogix 1400 User Manual

Publication 1766-RM001A-EN-P - October 2008
278 File Instructions
• 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:
• 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:
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
Word 0
EN
(1)
(1) EN - Enable Bit is set on false-to-true transition of the rung and indicates the instruction is enabled.
--
DN
(2)
(2) DN - Done Bit, when set, indicates that the stack is full.
EM
(3)
(3) EM - Empty Bit, when set, indicates FIFO is empty.
not used
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.
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
Data Files Function Files
CS - Comms IOS - I/O DLS - Data Log
Address
Mode
(1)
Address Level
O I S B T, C, R N F ST L MG, PD RI/RIX PLS RTC HSC PTOX, PWMX STI EII BHI MMI LCD Immediate Direct Indirect Bit Word Long Word Element
Source •• ••• • • • • •••
FIFO • • • • • •
• •••
Control
(2)
• •
Length
• •
Position
• •
(1) See Important note about indirect addressing.
(2) Control file only. Not valid for Timers or Counters.
IMPORTANT
You cannot use indirect addressing with: S, MG, PD, RTC, HSC, PTOX,
PWMX, STI, EII, BHI, MMI, CS, IOS, and DLS files.
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Allen-Bradley MicroLogix 1400 Specifications

General

Brand	Allen-Bradley
Model	MicroLogix 1400
Category	Controller
Language	English