Danfoss VLT MCA 121 EtherNet/IP User Manual

5How to Control
5.1 How to Control
5.1.1 I/O Assembly Instances
I/O Assembly Instances are a number of defined process control objects with defined content comprising control and status information.
Unlike DeviceNet it is possible to run with asymmetrical instances. E.g. 101/153 = 8 bytes/20 bytes.
It is not possible to mix instances across profiles, e.g. 20/100. Assembly instances must be consistent to the: ODVA or FC profile.
The controlling instance can be read in par. 12-20,
Control Instance .
The figure below shows the I/O Assembly Instance options for controlling and monitoring the FC 200/FC 300 drive.
Profile
(par.8-10
Control Word
Profile
)
Direction
Instances
(decimal)
Size
(bytes)
Data
ODVA
Originator →Target
20 4
21 4
Target →Originator
70 4
71 4
FC
Originator →Target
100 4
101 8
103 20
Target →Originator
150 4
151 8
153 20
NB!
Use of 32-bit process data.
For configuration of a 2-word (32-bit) parameter read/write, use 2 consecutive arrays in par. 12-21 and 12-22, like [2]+[3], [4]+[5],
[6]+[7] etc. Read/write of 2-word values in arrays like: [3]+[4], [5]+[6], [7]+[8] are not possible.
MCA 121 EtherNet/IP 5 How to Control
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Danfoss VLT MCA 121 EtherNet/IP Specifications

General

Brand	Danfoss
Model	VLT MCA 121 EtherNet/IP
Category	Control Unit
Language	English