Data Update - ABB NMBP-01 Installation And Startup Manual

Chapter 6 – Communication

Data Update

6-6
The NMBP-01 module has been designed for fast and reliable data transfer
between the Modbus Plus network and the ACS 600 drive. To get the maxi-
mum through put from the Modbus Plus network, the data is transferred
according Table 6-3 below.
Action
READ Data set
READ Parameter
WRITE Data set
WRITE Parameter
Table 6-3 Transfer Modes.
Note: Register writes have priority over reads. If your PLC program per-
forms continuous writes, the read data could be obsolete.
Response
Data is read immediately from the drive
Data is updated from the drive with the external
read interval.
Data is written immediately to the drive. The va-
lidity of write (value range and address range) is
checked, and if violation, an exception is gener-
ated.
Data is written directly to the drive. The validity
of write (value range and address range) is
checked, and if violation, an exception is gener-
ated.
Installation and Start-up Guide for NMBP-01