Siemens SIMATIC TIWAY 1 Manual de usuario descargar pdf (Pagina 93)

NIM Primitives

4-35

TIWAY 1 Ti505 NIM User Manual

4.9.12.3 Write

and Gather Block Primitive – Code 52

The Write and Gather Block Primitive specifies which blocks (as defined with Define

Block

Primitive 50) will be read. It also allows a user to replace any contiguous data ele

ment

locations.

The blocks to gather are specified through a 32-bit mask (EEEEEEEE).

the bit mask position which corresponds to a block specified in the Define Block Primi

tive,

a bit value

of 1 indicates that the block is to be returned. A bit value of 0 means that

the

block will not be returned.

You

should not request more data than can be returned in a maximum length Primitive

frame.

Following the mask are the descriptors associated with the write function, which

performed before the gather operation. The response will return the data associated

with

the requested blocks, beginning with the lowest block number and increasing to the

highest

block number

. A data block separator is not provided in the response.

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Siemens SIMATIC TIWAY 1 Manual de usuario Pagina 93