Rockwell-automation 1772-LV Mini-PLC - 2/15 Programmable Controller (S Manual de usuario descargar pdf (Pagina 175)

Quick Reference Section

Appendix A

A6

Table A.C

Relay

ype 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

-||-

When the addressed memory bit is on, the instruction is true.

-|/|- Examine Off XXX

-|/|-

When the addressed memory bit is off, the instruction is true.

-( )- Energize XXX

-( )-

When the rung is true, the addressed memory bit is set.

[1]]

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.

1 2 ... 170 171 172 173 174 175 176 177 178 179 180 ... 214 215

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