Rockwell-automation RECOMM-DNET DeviceNet Adapter for use with DPI AC Manual do Utilizador descarregar pdf (Página 59)

Using I/O Messaging

6-5

6.5.2 32-Bit Parameters Using 16-Bit Datalinks

To read (and/or write) a 32-bit parameter using 16-bit Datalinks,

typically both Datalinks (A,B,C,D) are set to the 32-bit parameter.

For example, to read Elapsed MWH (9), both Datalink A1 and A2

are set to “9.” Datalink A1 will contain the least significant word

(LSW) and Datalink A2 the most significant word (MSW). In this

example, the parameter 9 value of 5.8MWh is read as a “58” in

Datalink A1.

Regardless of the Datalink combination, x1 will always contain the

LSW and x2 will always contain the MSW. In the following

examples, Power Up Marker (242) contains a value of 88.4541

hours.

32-bit data is stored in binary as follows:

Example:

Power Up Marker (242)

= 88.4541 hours

MSW = 13

decimal

= 1101

binary

= 2

+ 2

= 851968

LSW = 32573

851968 + 32573 = 884541

Datalink

Most/Least

Significant Word Parameter Data (decimal)

A1 LSW 9 58

A2 MSW 9 0

Datalink

Most/Least

Significant Word Parameter

Data

(decimal)

A1 LSW 242 32573

A2 - Not Used - 0 0

Datalink

Most/Least

Significant Word Parameter

Data

(decimal)

A1 - Not Used - 0 0

A2 MSW 242 13

Datalink

Most/Least

Significant Word Parameter

Data

(decimal)

A2 MSW 242 13

B1 LSW 242 32573

MSW

through 2

LSW

through 2

1 2 ... 54 55 56 57 58 59 60 61 62 63 64 ... 167 168

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