Rockwell-automation 1772-LV Mini-PLC - 2/15 Programmable Controller (S Instrukcja Użytkownika Pobierz pdf (Strona 177)

Quick Reference Section

Appendix A

A8

Table A.E

Conter

Instructions

NOTE:

The counter word address, XXX, is assigned to the counter accumulated areas of the data table To determine which addresses are valid

accumulated areas, the most significant digit in the word address must be an even number.

Bit 14 is the overflow/underflow bit.

BIt 15 is the count complete bit.

BIt 16 is the enable bit the for CTD instruction.

Bit 17 is the enable bit for the CTU instruction.

The word address displayed will be 3 or 4 digits long depending on the data table size. WHen entering the word address, use a leading zero if

necessary.

Key Symbol Instruction Name 1770-T3 Display Rung Condition Status Bit

-(CTU)- Up Counter XXX

-(CTU)-

PR YYY

AC ZZZ

Each time the rung goes true, the

accumulated value is incremented one

count. The counter will continue counting

after the preset value is reached.

The accumulated value can be reset by the

CTR instruction

When the rung is true:

BIt 14 -= set if AC>999

Bit 15 - set when AC

≥PR

Bit 17 - set

When the rung is false:

Bit 14 and 15 - retained if it ws set

BIt 17 - reset

-(CTR)- Counter Reset XXX

-(CTR)-

PR YYY

AC ZZZ

XXX - Word address of the CTU is resetting

The preset and accumulated values are

automatically entered by the industrial

terminal.

When the rung is ture, the CTU, or CTD

accumulated value and status bits are reset

to 000.

When the rung is true:

Bit 14, 15, 16, 17 - reset

When the rung is false:

No action is taken.

-(CTD)- Down Counter XXX

-(CTD)-

PR YYY

AC ZZZ

Each time the rung goes true, the

accumulated value is decreased by one

count.

When the rung is true:

Bit 14 - set when AC <000

Bit 15 - set when AC<PR

Bit 16 - set

When the rung is false:

Bit 154 and 15 - retained if it was set

Bit 16 - reset

1 2 ... 172 173 174 175 176 177 178 179 180 181 182 ... 214 215

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