162 ACH580 E-Clipse bypass and packaged drive user manual
Fieldbus adapter
Control interface
In general, the basic control interface between the fieldbus system and the drive
consists of:
• Output Words:
– CONTROL WORD
– REFERENCE (speed or frequency)
• Input Words:
–STATUS WORD
– Actual Value (speed or frequency)
Note: The words “output” and “input” are used as seen from the fieldbus controller
point of view. For example an output describes data flow from the fieldbus controller
to the drive and appears as an input from the drive point of view.
The meanings of the controller interface words are not restricted by the ACH580.
However, the profile used may set particular meanings.
Control Word
The CONTROL WORD is the principal means for controlling the drive from a fieldbus
system. The fieldbus controller sends the CONTROL WORD to the drive. The drive
switches between states according to the bit-coded instructions in the CONTROL
WORD. Using the
CONTROL WORD requires that:
• The drive is in AUTO (AUTO) control.
• The communication channel is defined as the source for controlling commands
from EXT1 or EXT2. Set E-Clipse Parameter 1601= COMM[2].
• The external plug-in fieldbus adapter is activated when:
– Parameter 9802 COMM PROT SEL = 4 (EXT FBA) in E-Clipse Bypass Control
Board.
– The external plug-in fieldbus adapter is configured to use the drive profile
mode or drive profile objects.
Fieldbus
Fieldbus Controller
Control Word (CW)
References
Status Word (SW)
Actual Values
Parameter R/W Requests/Responses
Process I/O
Service
Messages
(Acyclic)
(cyclic)
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