22
SI-INTERBUS User Guide
Issue Number: 1
6.4.3
Cyclic input mappings
Parameters Pr
MM.010
to Pr
MM.019
specify the source parameters for the cyclic data
input mappings.
The reference for the source parameter is entered in the mapping parameter in the form
MMPP, where MM represents the menu number of the source parameter and PP
represents the parameter number of the source parameter.
6.4.4
Cyclic output mappings
Parameters Pr
MM.020
to Pr
MM.029
specify the destination parameters for the cyclic
data output mappings.
The reference for the destination parameter is entered in the mapping parameter in the
form MMPP, where MM represents the menu number of the destination parameter and
PP represents the parameter number of the destination parameter.
6.4.5
Data compression
By default, the SI-Interbus uses 32 bits for each data channel, even if the mapped
parameter is a 16-bit parameter. When cyclic data compression is enabled
(Pr
MM.034
= On), a data channel will only use 32 bits if the mapped parameter is a
32-bit parameter. If the mapped parameter is only 1, 8 or 16 bits wide 16 bits will be
used for that particular data channel.
The size of the data mapping will depend on the size of the target / source parameter.
If using 16-bit (or less) parameters the data can be sent as 16 bits on the network
(Pr
MM.034
= On).
Parameters larger than 16 bits always use 32 bits on the network irrespective of the
setting of Pr
MM.034
).
NOTE
NOTE
Cyclic Input Mappings 1 to 10
Pr
MM.010
to
Pr
MM.019
Default
Mapping 1: 1040
Mapping 2: 201
Mapping 3 to 10: 0
Type
16-bit
Access
RW
Cyclic Output Mappings 1 to 10
Pr
MM.020
to
Pr
MM.029
Default
Mapping 1: 642
Mapping 2: 121
Mapping 3 to 10: 0
Type
16-bit
Access
RW
The cyclic data channels do not use decimal points. To write a value of 24.6 Hz to
Pr
1.021
, the value must be transmitted as 246.
NOTE
NOTE
Cyclic Data Compression Enable
Pr
MM.034
Default
0 (Off)
Type
1-bit
Access
RW
