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NIM Primitives
4-44 SIMATIC TIWAY I Series 500 NIM User Manual
Series 500 NIM Primitive Descriptions (continued)
Availability: Releases 2.1, 2.2, and 3.0
The Record Data Acquisition Primitives allow repetitive collection of
multiple predefined blocks of data. The Define Record Primitive (55) allows
multiple blocks of data to be defined as a single record. The Gather Record
Primitive (56) collects the data blocks for the requested records. The Write
and Gather Record Primitive (57) combines the functions of the Write Block
Primitive (30) and the Gather Record Primitive (56).
NOTE: The record definitions within the NIM are destroyed in the event of a
power loss or a hardware reset (HDLC DISC). Any initialization or
re-initialization procedures must use the Define Record Primitive (55) to
re-define the data acquisition records.
Define Record Primitive – Code 55. The Define Record Primitive
specifies up to 32 records with 32 blocks per record. The records are
referenced by number, ranging from 1 (hex) to 20 (hex). A record, once
defined, can be re–defined to different data element types and for a new
record. A record may be restored to the initial state of “undefined” by
specifying the number of Data type Definitions (DD – blocks) in the record
as zero.
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Symbol Value Definition
CC Number assigned to the record. The allowable range is
1 to 20 hex.
DD Number of data type definitions (blocks) for the record.
TT Data element type
AAAA Data element location
Record Data
Acquisition
Primitive Codes 55,
56, and 57