Allen-Bradley MicroLogix 1100 Instruction Set Reference Manual

Publication 1763-RM001C-EN-P - October 2009
242 Sequencer Instructions
• Mask - The mask operand contains the mask constant, word, or file
which is applied to both file and source. When mask bits are set to
1, data is allowed to pass through for comparison. When mask bits
are reset to 0, the data is masked (does not pass through to for
comparison). The immediate data ranges for mask are from 0 to
0xFFFF or 0 to 0xFFFFFFFF.
.
• Source - This is the value that is compared to file.
• 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 steps in the
sequencer file (as well as Mask and/or Source if they are file data
types). The length of the sequencer can range from 1 to 256.
• Position - This is the current location or step in the sequencer file
(as well as Mask and/or Source if they are file data types). It
determines the next location in the stack to receive the current
comparison data. Position is a component of the control register.
The position can range from 0 to 255 for words and 0 to 127 for
long words. The position is incremented on each false-to-true
transition.
TIP
If mask is direct or indirect, the position selects the
location in the specified file.
15 1413 1211 10 9 8 76543210
Word 0
EN
(1)
(1) EN - Enable Bit is set by a false-to-true rung transition and indicates that the instruction is enabled.
--
DN
(2)
(2) DN - Done Bit is set after the instruction has operated on the last word in the sequencer file. It is reset on the next
false-to-true rung transition after the rung goes false.
--
ER
(3)
(3) ER - Error Bit is set when the controller detects a negative position value, or a negative or zero length value. When the
ER bit is set, the minor error bit (S2:5/2) is also set.
not used
FD
(4)
(4) FD - Found bit is set when the status of all non-masked bits in the source address match those of the word in the
sequencer reference file. This bit is assessed each time the SQC instruction is evaluated while the rung is true.
not used
Word 1 Length - contains the number of steps in the sequencer reference file.
Word 2 Position - the current position in the sequence
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Allen-Bradley MicroLogix 1100 Specifications

General

Brand	Allen-Bradley
Model	MicroLogix 1100
Category	Controller
Language	English