Chapter 5 – Programming
NMBA-01 Installation and Start-up Guide
5-3
GOOD MESSAGES
This diagnostics counter increases by one every time a valid Modbus
message has been received by NMBA-01 Module. This counter will roll
over from 32767 back to 0. During normal operation, this counter is
increasing constantly.
BAD MESSAGES
This diagnostics counter increases by one every time the NMBA-01
Module finds any kind of communication error. This counter will roll
over from 32767 back to 0. During normal operation, this counter
hardly ever increases.
DDCS CHANNEL
Selects the DDCS CHANNEL of the drive to which the fibre optics are
connected. This parameter is only used with ACS 600.
Note: The changes to the parameters do not take effect immediately.
To change the module settings, the power must be disconnected from
the NMBA-01.
Control Locations
ABB drives can receive control information from multiple sources
including digital inputs, analogue inputs, the drive control panel and a
communication module (e.g. NMBA-01). ABB drives allow the user to
separately determine the source for each type of control information
(Start, Stop, Direction, Reference, Fault Reset, etc.). In order to give
the fieldbus master station the most complete control over the drive,
the communication module must be selected as source for this
information. See the user documentation of the drive for information on
the selection parameters.
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