Delta DVP-15MC Series, Operation Manual

Page: 328 / 972

Chapter 8 Logic Instructions
8-241
8_
8.14.3.3 RS485_Link_Status
FB/FC Explanation Applicable model
FB
RS485_Link_Status is used to watch if an error occurs in the 485 link
which the number corresponds to or if the slave replies with error codes.
DVP15MC11T
DVP15MC11T-06
R S485_Link_Status
Enable
RS485_Link_Status_instance
LinkNum
Valid
R S485_Link_Error
RS485_Link_ErrorID
Error
ErrorID

Input Parameters
Parameter
name
Function Data type
Valid range
(Default)
Validation
timing
Enable
The instruction is validated when
Enable changes from FALSE to
TRUE.
BOOL
TRUE or FALSE
（
FALSE
）
LinkNum
The number of the link to be watched. UINT
1~24
(The variable value
must be set)
When Enable
changes from
FALSE to TRUE

Output Parameters
Parameter name Function Data type Valid range
Valid
TRUE when the outputs of the instruction are valid. BOOL
TRUE / FALSE
RS485_Link_Error
TRUE when an error occurs in the corresponding
link. It is valid when
Error is FALSE.
BOOL TRUE / FALSE
RS485_Link_ErrorID
Outputs communication error code. See error codes
and their meanings as below:
1: Unidentified function code
2: The address in the response message from the
slave is different from the configured address.
3: The length of received data in the response
message from the slave is inconsistent with the
configured length.
4: Data-receiving timeout
5: Checksum error
6: The configured lengths of data to be read and
written are both 0.
7: The length of the data that is actually received
exceeds the max. received data length.
8: Data-sending timeout
16#80+ exception code: the exception code from the
slave
WORD
Error
TRUE when an error occurs in the instruction inputs. BOOL TRUE / FALSE
ErrorID
Contains error codes when an error occurs in the
instruction execution. Please refer to section 12.2 for
the corresponding error code.
WORD

Output Update Timing