NORD Drivesystems BU0280 - Manual (Page 46)

Supplementary Manual DeviceNet for NORDAC SK 200E
46 Subject to technical amendments BU 0280 GB
4.3.9 Class 100 to 181 – Access to FI and bus module parameters
All parameters of the bus module and the FIs connected to the bus module can be accessed via the
DeviceNet. The FIs connected to bus module can be accessed via various Class ranges. See following table.
DeviceNet Class Accessed device FI Offset
100 to 107 FI 1 0
110 to 117 FI 2 10
120 to 127 FI 3 20
130 to 137 FI 4 30
181 Bus module (Class 180 – 189 reserved)
Coding of the FI parameters in DeviceNet format is carried out as follows:
Parameter number to DeviceNet:
Class
= (100 + PNo. / 100) + FI Offset
Attribute = PNo. mod 100 (mod = modulus operation  Attribute = Remainder (PNo. / 100))
Instance = SubIndex + 1
DeviceNet to parameter number:
PNo.
= ((Class – FI Offset) – 100) * 100 + Attribute
SubIndex = Instance – 1
Examples:
FU1, P103, SubIndex 0
 Class = 101, Attribute = 3, Instance = 1
FU4, P103, SubIndex 2  Class = 131, Attribute = 3, Instance = 3
FU1, P546, SubIndex 0  Class = 105, Attribute = 46, Instance = 1
FU3, P546, SubIndex 0  Class = 125, Attribute = 46, Instance = 1
4.3.10 Class 199 - NORDAC Index Object
All FI parameters can be accessed via this object. Access to bus module parameters or the parameters of
other modules on the system bus is not possible.
Access is obtained by setting the parameter number and the sub index. Then the parameter can be read or
written via attribute 3 or 4 of the parameter. The relevant FI is selected via the instance, i.e. with Instance = 1,
FI 1 is accessed, or with Instance = 4, FI 4 is accessed.
Inst. Attr. Description Type Access
1 to 4 1 Parameter number UINT Read/Write
1 to 4 2 Parameter Index USINT Read/Write
1 to 4 3 Read / write 16 bit parameter INT Read/Write
1 to 4 4 Read / write 32 bit parameter DINT Read/Write
Attribute 4 with 32 bit access is not contained in the EDS file, as otherwise the commissioning tools would
access a parameter via attributes 3 and 4. This results in an error message for an incorrect parameter size
(32Bit access to a 16Bit parameter).
In the EDS file and the bus module, attribute 1 is set to 0 as default. Parameter accesses with parameter 0 are
ignored and always receive a positive response, even if the relevant FI is not online. This prevents
unnecessary error messages.