User`s manual

5-16 Series 90™-30 CPU with Embedded PROFIBUS Interface – November 2004 GFK-2334A
5
Read Module Header (5)
The Read Module Header command retrieves Network Diagnostic Information and
statistics from the device
Read Module Header Command Block – Basic Example
The following command block accomplishes the following:
Read Module Header Data.
Return the COMMREQ Status Word to %R10—%R13.
Return the Device Status to %R251—%R270.
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 5 (0005) Read Module Header 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 20 (0014) Size of response area, 20 for master
(Word 7) Command Code: Word 7 specifies the Command code for the COMMREQ to
be executed. Read Module Header = 5
(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 Memory Size is 20.. The user is responsible for assuring
that this area is large enough to contain the requested data without overwriting other
application data