ABB ACH550-01, User Manual

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146 Serial communications
ACH550 User's Manual
Fieldbus control interface
The basic control interface between the fieldbus system and the
drive consists of the control word, speed reference, status word
and actual speed or frequency. Depending on the type of the
plug-in fieldbus adapter, additional process data can be defined
by means of the parameters in
Group 51: EXT COMM MODULE
or by means of fieldbus-specific parameters accessible via the
network (refer to the fieldbus user's manual). The maximum
amount of process data is limited to 15 words. The actual
amount of process data supported by the plug-in fieldbus
adapter module depends on the fieldbus adapter type.
Note that the word 'output' is used to describe data flow from the
fieldbus controller to the drive and the word 'input' is used to
describe data flow from the drive to the fieldbus controller. In
other words, the direction of flow (input or output) is seen from
the fieldbus controller point of view.
Process data from fieldbus
controller to drive
Process data from drive to
fieldbus controller
Output word Contents Input word Contents
1 Process data 1 1 Process data 1
2 Process data 2 2 Process data 2
3 Process data 3 3 Process data 3
4 Process data 4 4 Process data 4
5 Process data 5 5 Process data 5
6 Process data 6 6 Process data 6
7 Process data 7 7 Process data 7
8 Process data 8 8 Process data 8
9 Process data 9 9 Process data 9
10 Process data 10 10 Process data 10
11 Process data 11 11 Process data 11
12 Process data 12 12 Process data 12
13 Process data 13 13 Process data 13
14 Process data 14 14 Process data 14
15 Process data 15 15 Process data 15