User`s manual

5-14 Series 90™-30 CPU with Embedded PROFIBUS Interface – November 2004 GFK-2334A
5
Get Device Diagnostics (4)
The Get Device Diagnostic command retrieves detailed status information for the
specified device.
Get Device Diagnostics Command Block – Basic Example
The following command block accomplishes the following:
Get Device Diagnostics for Device 1 (a PBS201Release 1).
Return the COMMREQ Status Word to %R10—%R13.
Return the Device Status to %R251—%R259.
Word Dec (Hex) Definition
Word 1 5 (0005) 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 4 (0004) Get Device Diagnostics 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 9 (0009) Maximum size of response area.
If this value is not large enough to fit all the diagnostic data, a 7 is
returned in the COMMREQ Status Word. The user is responsible for
allocating enough space to contain the requested data without
overwriting other application data.
Word 11 1 (0001) Slave number (0—125)
(Word 7) Command Code: Word 7 specifies the Command code for the COMMREQ to
be executed. Get Device Diagnostics = 4.
(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. If the Diagnostic data does not fit in this memory block, a value of 7 is
returned in the COMMREQ Status Word. The user is responsible for assuring that this
area is large enough to contain the requested data without overwriting other application
data.