Publication 1766-RM001A-EN-P - October 2008
Input and Output Instructions 305
IOM - Immediate Output
with Mask
Instruction Type: output
The IOM instruction allows you to selectively update output data without
waiting for the automatic output scan. This instruction uses the following
operands:
• Slot - The slot is the physical location that is updated with data from
the output file.
• Mask - The mask is a hex constant or register address containing the
mask value to be applied. If a given bit position in the mask is a “1”,
the corresponding bit data is passed to the physical outputs. A “0”
prohibits corresponding bit data from being passed to the outputs.
The mask value can range from 0…0xFFFF.
• Length - This is the number of masked words to transfer to the
outputs.
IOM
Immediate Output w/Mask
Slot O:0.0
Mask N7:0
Length 1
IOM
TIP
This instruction is used for embedded I/O only. It is not designed to be used
with expansion I/O.
Execution Time for the IOM Instruction
Controller When Rung Is:
True False
MicroLogix 1400 10.4010 µs 0.3220 µs
IMPORTANT
Slot 0 is the only valid slot number that can be used with this
instruction. IOM cannot be used with expansion I/O.
Bit 1514131211109876543210
Output Data Output Word
Mask 0000000011111111
Real
Outputs
Data is Not Updated Updated to Match Output Word
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