User`s manual

5-18 Series 90™-30 CPU with Embedded PROFIBUS Interface – November 2004 GFK-2334A
5
Clear Counters (6)
This command sets the counters in the PROFIBUS Master CPU366 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 5-5.
(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: Word 10 specifies the size of the memory block for
the response. The response requires 2 words. If Response Memory Size is set greater
than 2, the COMMREQ will fail.
Clear Counters Reply Data Format
Word Name Description
Word 1 CommandCode Echo of Command code that this data block is replying to. (0x0006)
Word 2 StatusCode Reports 1 for success and 0 for failure.