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7.2
Structure of DX 0
Start ID
Field
Field ID
Field length
Parameters
End ID
CPU 948 Programming Guide
C79000-G8576-C848-04
DX 0 consists of three parts:
• • the start ID for DX 0 (DW 0, 1 and 2) ,
• • several fields of different lengths (depending on the number of
parameters)
and
• • the end ID.
ASCII characters MASKX0 in DW 0 to DW 2
A field in DX 0 consists of one to n data words. These contain the
following:
• • the field ID,
• • the field length
and
• • the field parameters.
The field ID specifies the meaning of the parameters following it.
Each field is assigned to a specific system program section or to a
specific system function (e.g. the field ID "04" identifies the parameter
field for cyclic program execution).
The field length specifies how many data words are occupied by the
parameters.
The possible parameters are listed in Section 7.3. The specified
numerical values are in hexadecimal format (KH).
This indicates the end of DX 0 with EEEEH in the last data word.
Structure of DX 0
7 - 5
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