Rockwell-automation 1769-L23E-QB1B_L23E-QBFC1B_L23-QBFC1B CompactLogix Uživatelský manuál stáhnout pdf (Strana 214)

214 Publication IASIMP-QS010B-EN-P - October 2009

Chapter 3 Embedded I/O

9. Enter the counter’s maximum and minimum counts.

The highest maximum count you can use is +2147483647. The lowest

minimum count limit you can use is -2147483648.

10. Specify the counter mode you need for your application.

11. Use the Operational Mode pull-down menu to select the counter’s

operational mode.

Use this counter mode When your application requires this behavior

Ring Counter If the current count value is counting up and exceeds the

maximum count, the counter begins counting again from the

minimum count.

If the current count value is counting down and exceeds the

minimum count, the counter begins counting again from the

maximum count.

Linear Counter If the current count value is over or under the maximum and

minimum counts specified, counting stops and

overflow/underflow bits are set.

TIP

The operational modes that are available depend upon the

number of HSC counters you are using.

Use this table as a reference when determining what operation

modes you can use in your application.

Number of

Counters

Counter Operational Mode Gate or Preset

Functionality

10Any All

1…3 Not available

20Any All

1Any All

2 and 3 Not available

1 2 ... 209 210 211 212 213 214 215 216 217 218 219 ... 248 249

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Rockwell-automation 1769-L23E-QB1B_L23E-QBFC1B_L23-QBFC1B CompactLogix Uživatelský manuál Strana 214