DL06 Micro PLC User Manual, 3rd Edition, Rev. E
5-9
Chapter 5: Standard RLL Instructions
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Immediate Boolean
The DL06 Micro PLCs can usually complete an operation cycle in a matter of milliseconds.
However, in some applications you may not be able to wait a few milliseconds until the next
I/O update occurs. The DL06 PLCs offer Immediate input and outputs which are special
boolean instructions that allow reading directly from inputs and writing directly to outputs
during the program execution portion of the CPU cycle. You may recall that this is normally
done during the input or output update portion of the CPU cycle. The immediate instructions
take longer to execute because the program execution is interrupted while the CPU reads or
writes the I/O point. This function is not normally done until the read inputs or the write
outputs portion of the CPU cycle.
NOTE: Even though the immediate input instruction reads the most current status from the input point,
it only uses the results to solve that one instruction. It does not use the new status to update the image
register. Therefore, any regular instructions that follow will still use the image register values. Any
immediate instructions that follow will access the I/O again to update the status. The immediate output
instruction will write the status to the I/O and update the image register.
X0
OFF
X1
OFF
CPU Scan
Read Inputs
Diagnostics
Input Image Register,
The CPU reads the inputs from the local
base and stores the status in an input
image register
.
X0
Y0
X0
X1
X2
...
X11
OFF
OFF
ON
...
OFF
Solve the Application Program
Read Inputs from Specialty I/O
Write Outputs
Write Outputs to Specialty I/O
X0
ON
X1
OFF
I/O Point X0 Changes
I
PORT1
PORT2
TERM
RUN STOP
PWR
RUN
CPU
TX1
RX1
TX2
RX2
0
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06
LOGIC
Koyo
Immediate instruction does not use the
input image register, but instead reads
the status from the module immediately.
