User`s manual

6-10 Series 90™-30 CPU with Embedded PROFIBUS Interface – November 2004 GFK-2334A

Clear Counters (6)

The Clear Counters Command sets the counters in the PROFIBUS module to zero.

Clear Counters Command Block – Basic Example

In the following command block, Status is returned in %R251—%R252 (words 8 and 9).

Word Dec (Hex) Definition

Word 1 4 (0004) Length of command Data Block

Word 2 0 (0000) Always 0 (no-wait mode request)

Word 3 8 (0008) Memory type of COMMREQ status word (%R)

Word 4 9 (0009) COMMREQ status word address minus 1 (%R10)

Word 5 0 (0000) Reserved

Word 6 0 (0000) Reserved

Word 7 6 (0006) Clear Counters command number

Word 8 8 (0008) Memory type to write response (%R)

Word 9 250 (00FA) Starting Address to write response (response written to %R251)

Word 10 2 (0002) Maximum size of response area

(Word 7) Command Code: Word 7 specifies the Command code for the COMMREQ to

be executed. Clear Counters = 6

(Word 8) Local PLC - Memory Type: Words 8—9 specify the location in the PLC where

the response will be written. Values for Word 8 are listed on page 6-4.

(Word 9) Local PLC - Memory Starting Address: Word 9 is a 0-based offset that

determines the starting address in the local PLC in which the response is to be written.

The value entered is the offset (0-based) from the beginning of PLC memory for the

memory type and mode specified in Word 8. This offset will be either in bits, bytes, or

words depending on the mode specified (for example, if Word 8=16 and Word 9=2, the

starting address will be %I17). Valid ranges of values depend on the PLC’s memory

ranges.

(Word 10) Response Memory Size: Words 10 specifies the size of the memory block for

the response. The Response Memory Size is 2 words. If the Response Memory Size

(word 10 in the Clear Counters command block) is set greater than 2, the COMMREQ will