GE GFK-0804B 用户手册
C
C-13
GFK–0804B
Appendix C RTU Protocol
Message (05): Force Single Output
Format:
Address
Func
Error Check
05
Query
Normal Response
Number
Point
Hi Lo Hi Lo
Data
Address
Func
Error Check
05
Number
Point
Hi Lo Hi Lo
Data
00H
00H
Query:
H An address of 0 indicates a broadcast request. All slave stations process a broadcast
request and no response is sent.
H The function code is equal to 5.
H The point number field is two bytes in length. It may be any value less than the
H The point number field is two bytes in length. It may be any value less than the
highest output point number available in the Micro PLC. It is equal to one less than
the number of the output point to be forced on or off.
the number of the output point to be forced on or off.
H The first byte of the data field is equal to either 0 or 255 (FFH). The output point
specified in the point number field is to be forced off if the first data field byte is
equal to 0. It is to be forced on if the first data field byte is equal to 255 (FFH). The
second byte of the data field is always equal to zero.
equal to 0. It is to be forced on if the first data field byte is equal to 255 (FFH). The
second byte of the data field is always equal to zero.
Response:
H The normal response to a force single output query is identical to the query.
Note
The force single output request is not an output override command.
The output specified in this request is ensured to be forced to the value
specified only at the beginning of one sweep of the Micro PLC user
logic.
The output specified in this request is ensured to be forced to the value
specified only at the beginning of one sweep of the Micro PLC user
logic.