Technical data

Index Protocols and Communication Data List
B-4
P/N 7135049A
E 2007 Nordson Corporation
VBC_Siemens
Data Block Processing
The master formulates a job by determining the transmission data block.
The Nordson melter processes the job and formulates the reply (receive
data block).
The master processes the data or repeats the job until a reply is received
from the Nordson melter. Only one job is processed at a time. The Nordson
melter keeps the reply available until the master formulates a new job.
When a job (Command) can not be executed, the Nordson melter replies
with a fault signal in Status. The master recognizes by this signal whether
the previously transmitted command was correctly processed by the
Nordson melter.
The master must check whether the Acknowledge data (Data index and
Channel number) from the Nordson melter corresponds to the data in the
transmission data block. If the data are identical, the job is completed. Each
data index can also be retrieved to check values written earlier.
NOTE: Melter control, Melter control1 and Melter control2 and Line speed
value for motor 1−n are processed by the Nordson melter for every
transmission data block, regardless of what was entered by Command.