Rockwell Automation 1772-LV Mini-PLC - 2/15 Programmable Controller (Series B) Programming and Operations - Manual (Page 175)

Quick Reference Section
Appendix A
AĆ6
Table A.C
Relay Type Instructions
NOTE: You can assign input and output address, XXXXX, to any location in the data table, excluding the processor work areas.
The word address is displayed above the instruction and the bit number below it. To enter a bit address larger than 5 digits,
press [EXPAND ADDR] after the instruction key and then enter the bit address. Use a leading zero if necessary.
Key Symbol
Instruction Name 1770-T3 Display
Rung Conditions
-||- Examine On XXX
-||-
XX
When the addressed memory bit is on, the instruction is true.
-|/|- Examine Off XXX
-|/|-
XX
When the addressed memory bit is off, the instruction is true.
-( )- Energize XXX
-( )-
XX
When the rung is true, the addressed memory bit is set. [1]] If
the bit controls an output device that output device will be on.
-(L)- Latch XXX
-(L)-
ON XX
or OFF
When the rung is true, the addressed memory bit is latched on
and remains on until it is unlatched. [1] ] The output latch
instruction is initially off when entered, as indicated below the
instruction. it can be preset on by pressing a [1] after entering
the bit address. An on will then be indicated below the
instruction in program mode. An unlatch instruction will always
override a latch instruction, even if the latch rung is true.
-(U)- Unlatch xxx
-(U)-
ON XX
or OFF
When the rung is true, the addressed bit is unlatched. [1] ] If the
bit controls an output device, that device is de-energized. On
or off will appear below the instruction indicating the status of
the bit in Program mode only.
Branch Start This instruction begins a parallel logic path and is entered at
the beginning of each parallel path.
Branch End This instruction ends two or more parallel logic paths and is
used with branch start instructions.
[1] ] These intructions should not be assigned input image table addresses because input image table words are
reset each I/O scan.