Read Block Primitive - Code - Siemens SIMATIC TIWAY 1 User Manual

Read Block
Primitive – Code 20
SIMATIC TIWAY I Series 500 NIM User Manual
Availability: Releases 1.1, 2.1, 2.2, and 3.0
Primitive 20 is a command to read a single contiguous block of data in the
Secondary device. Read Block will access contiguous data element locations
from a given data element location.
Request: LLLL 20 TT NNNN AAAA
Symbol Value
TT
NNNN
AAAA
Response: LLLL 20 HH DD ... DD
Symbol Value
HH
DD
Definition
Data element type
Number of locations
Data element location
(repeated)
Definition
Attached device operational status
Data
NIM Primitives 4-37