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NIM Primitives

4-4

TIWAY 1 TI505 NIM User Manual

FIELD

First Transmitted Bit

Least Significant Bit

Most Significant Bit

Figure 2

Binary W

eight of the Fields

4.3.1 Normal

Operation and Exceptions

Normal

Primitive operation consists of a request and response sequence without excep

tions.

Exceptions are errors found in the interpretation or execution of a Primitive.

The

normal operation of a Primitive is for the initiating (Host) station to form a request

Primitive

and address it to a Secondary on

the network. If the request Primitive contains

allowable

descriptor and data unit fields, a legal Primitive Code for

the attached device,

and the correct Length Field value, then the Secondary will return a response

Primitive

the proper format.

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Siemens SIMATIC TIWAY 1 Bedienungsanleitung Seite 62