Siemens 500 NIM User Manual
Page 94
NIM Primitives
4-41
SIMATIC TIWAY I Series 500 NIM User Manual
Symbol
Value
Definition
CC
Block number (1–20 hex)
TT
Data element type
NNNN
Number of locations
AAAA
Data element location
Response: LLLL 50 HH
Symbol
Value
Definition
HH
Attached device operational status
Gather Block Primitive – Code 51. The Gather Block Primitive specifies
which blocks (as defined by the Define Block Primitive 50) will be read. The
blocks are specified through a 32-bit mask (EEEEEEEE).
Each bit position in the bit mask corresponds to a block that was defined
with Primitive 50, Define Block. A bit set to 1 indicates that the block is to
be returned. A bit set to 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. 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.
Request: LLLL 51 EEEEEEEE
where EEEEEEEE is 32 bits, defined as:
Block Number 1 (hex)
Block Number
20 (hex)
. . .
. . .
MSB
LSB
Response: LLLL 51 HH EEEEEEEE DD ... DD
(repeated)