Allen-Bradley MicroLogix 1100 Instruction Set Reference Manual

Publication 1763-RM001C-EN-P - October 2009
240 Sequencer Instructions
SQC- Sequencer
Compare
Instruction Type: output
On a false-to-true rung transition, the SQC instruction is used to compare
masked source words or long words with the masked value at a reference
address (the sequencer file) for the control of sequential machine
operations.
When the status of all non-masked bits in the source word match those of
the corresponding reference word, the instruction sets the found bit (FD)
in the control word. Otherwise, the found bit (FD) is cleared.
The bits mask data when reset (0) and pass data when set (1).
The mask can be fixed or variable. If you enter a hexadecimal code, it is
fixed. If you enter an element address or a file address (direct or indirect)
for changing the mask with each step, it is variable.
When the rung goes from false-to-true, the instruction increments to the
next step (word) in the sequencer file. Data stored there is transferred
through a mask and compared against the source for equality. While the
rung remains true, the source is compared against the reference data for
every scan. If equal, the FD bit is set in the SQCs control counter.
Applications of the SQC instruction include machine diagnostics.
EN
DN
FD
SQC
Sequencer Compare
File #B3:0
Mask N7:0
Source I:0.0
Control R6:0
Length 1<
Position 0<
SQC
Execution Time for the SQC Instruction
Controller Data Size When Rung Is:
True False
MicroLogix 1100 word 23.7 μs 6.24 μs
long word 24.21 μs 6.24 μs
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Allen-Bradley MicroLogix 1100 Specifications

General

Brand	Allen-Bradley
Model	MicroLogix 1100
Category	Controller
Language	English