2014-
02
42
Commands
7.4.7
Data length
Depending on the data length required, four different attributes with different lengths are
available for each input/output instance.
Attributes 1-3 require fewer data bytes than attribute 4.
7.4.8
Assembly attributes
The attributes of the output object (class 64h) and the input objects (class 65h) appear in
different combinations in the assembly object. 26 assembly instances can be used in pairs for
implicit communication and so there are 13 possible combinations. These combinations can be
selected either via the device display, the attribute 100 from instance 0 of the assembly object
or by specifying the combination on the PLC (Forward Open).
Attribute ID
Data length
Maximum number of double words (4 bytes)
that can be read/written at any one time
1
8
1
2
12
2
3
32
7
4
60
14
Table 7.17
Class 64h and 65h, instance 1-6
attribute 4
attribute 3
attribute 2
attribute 1
Output
instance
Input
instance
Channel size
Required/
Generated size
Output/Input
byte
1
2
3
4
5
(conf.)
Mixed
mode
100d
150d
8*
8 / 8
101d
151d
12*
12 / 12
102d
152d
32*
32 / 32
103d
153d
60*
60 / 60
