Siemens 500 NIM - Manual (Page 56)

NIM Primitives 4-3 SIMATIC TIWAY I Series 500 NIM User Manual
4.2 Primitive Functions
Primitives serve as the command structure that a TIWAY I Primary uses to
access (read or write) information in a TIWAY I Secondary. The Primitives
defined in the following paragraphs serve these basic functional needs:
•
To access and retrieve data
•
To ascertain the status and configuration of attached devices
•
To perform control operations on the attached device