User`s manual

Western Reserve Controls, Inc. 1782-JDO User’s Manual
PRELIMINARY
24
6.3 Parameter Object, Class Fhex (15dec)
There are many configurable data parameters associated with your JDO. The JDO uses
a Parameter Object (a collection of these parameters) to assist you in reading and changing
configurable data.
Following are the Class Attributes, Instance Attributes and Services that are supported by the
JDO for the Parameter Object.
Table 6-5 Parameter Class Attributes (Instance 0)
Attribute
ID
Access
Rule
Name
DeviceNet
Data Type
Description of Attribute Value
1 Get Revision UINT Revision of this object. 1
2 Get
Max.
Instance
UINT
Maximum instance number of the
Parameter object
9
8 Get
Parameter
class
descriptor
WORD Bits that describe parameters.
9
(supports parameter
instances, pa
rams are
stored in non-volatile
memory)
Table 6-6 Parameter Instance Attributes (Instances 1-7)
Attribute
ID
Access
Rule
Name DeviceNet Data Type Description of Attribute Value
1 Set
Parameter
Value
data type specified in
Descriptor Data Type
and Data Size.
Actual value of parameter. It can
be read from or written to. This
attribute is read-only if bit 4 of
Attribute 4 is TRUE.
2 Set Link Path Size USINT
Size of link path. If this is 0, then
no link is specified.
Number of
bytes
3 Set Link Path
ARRAY of DeviceNet
path:
DeviceNet path to the object from
where this parameter’s value is
retrieved.
4 Get Descriptor WORD Description of parameter.
5 Get Data Type USINT Data type code.
6 Get Data Size USINT
Number of bytes in Parameter
Value
Table 6-7 Parameter Common Services
Service
Code
Class Instance Service Name Description of Service
O5
hex
Yes N/A Reset
Resets all parameters to “out-of-
the-box” values.
OE
hex
Yes Yes Get_Attribute_Single
Returns the contents of the
specified attribute.
10
hex
Yes Yes Set_Attribute_Single Modifies an attribute value.
Table 6-8 JDO Parameter Instances (Class F
hex
)
For this table See Table 5-1