Rockwell Automation PLC-5 Fieldbus Solutions for Integrated Architecture User Manual - Manual (Page 173)

Publication 1757-UM006A-EN-P - May 2002
Using the 1788-CN2FF, ControlNet-to-FOUNDATION Fieldbus H1 Linking Device 7-13
ControlNet Discrete Output Objects
The linking device creates an instance of a ControlNet DO object for
every wired channel in the MDO block instances. Each instance of the
ControlNet DO object has the attributes shown in Table 7.D.
The BkCalStatus is created only when the controller is capable of
participating in the CAScade initialization handshake, that is, when the
BKCAL_OUT_D of the DO block is wired to a BKCAL_INx parameter
of the MDO block.
Only Value, CNStatus, casInstatus, ReadBack, and TagDesc are created
when an MDO channel is connected to something other than a DO
function block CAS_IN_D parameter.
Table 7.D ControlNet Discrete Output Object Attributes
Attribute
Number Name Type Access Initial Value Remarks
3 Value Boolean Set 0 This is written from the ControlNet
side.
4 CNStatus Boolean Set Bad ControlNet status. 0-Good; 1-Bad.
6 FailStateValue uint8 Set 0 The linking device writes the value to
the DO block when this attribute is
changed by the controller.
151 TagDesc String Get As configured Tag of the Fieldbus function block that
this object instance represents.
152 FailstateTime Float Set 0 The linking device writes the value to
the DO block when this attribute is
changed by the controller.
153 ReadBack uint8 Get 0 This represents the BKCAL_OUT _D
value from the DO block.
154 BkCalStatus uint8 Get Bad:Not-
Connected This represents the status of the
Readback attribute.
155 casInstatus uint8 Set Bad:Not-
connected This represents the status of the
CAS_IN_D to the DO block.