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4.3 Requests to the DN611B
Unified Controller nv Series DeviceNet Module DN611B Instruction Manual
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4.3.6
RAS Information read request
1) Function
This request reads the DN611B's RAS information from the controller. There are three kinds of RAS
information read by this request: RAS history counter, event history, and execution node information (slave
device execution information possessed by the DN611B). The RAS information can be read anytime unless
the DN611B is in initialize mode.
The contents of RAS data read are explained in 6.1.3 RAS Information Read Data.
2) Diagrammatic representation (Function block)
DN_RASREAD
REQ
DONE
CH
ERR
UNIT
STATUS
SLOT
READ_DT
REQTYPE
POSITION
N
Input parameters Output parameters
REQ BOOL type Execution enabled DONE BOOL type Completed
CH WORD type Channel No. ERR BOOL type Error
UNIT WORD type Unit No. STATUS WORD type Completion status
SLOT WORD type Slot No. READ_DT Structural data RAS information
REQTYPE WORD type Type of request
information type
type read data
POSITION WORD type Read start position
N WORD type Read quantity
See [4.5 Completion Status] for the contents of the completion status.
3) Description of operation
a)
When REQ is TRUE, the module specified by CH, UNIT, and SLOT executes the read request.
b)
The RAS information specified by RETYPE, POSITION, and N is output beginning with the top of
RAS_DT 0 is output where RAS information is not output.
c)
RAS_DT is described in the next item.
d)
After the RAS information read, DONE is turned TRUE.
e)
If the request processing is not completed in 2 seconds or more due to an error or the like, ERR and
DONE are turned TRUE.