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Chapter 7 Communication function
7-71
In case registration format of registration No. is the reading of named variables
Format
Name
Header
Station
No.
Command
Registration
No
Number of
blocks
Number of
data
Data Tail
Frame
check
Frame (Ex.) ACK H10 Y(y) H1F H01 H04 H9183AABB ETX BCC
ASCII value H06 H3130 H59(79) H313F H3031 H3034
H39313833414
14242
H03
9
Data format such as the number of blocks and number of data is the same as in variable reading.
9
Station number, commands, and register No. are the same as in computer request format.
9
BCC : When command is one of lower case(y), only one lower byte of the value resulted by adding 1 byte
each to ASCII values from ACK to ETX is converted into ASCII, added to BCC, and sent.
3) response Format(for PLC NAK response)
Format
Name
Header
Station
No.
Command
Registration
No
Error code
(HEX 2Byte)
Tail Frame check
Frame (Ex.) NAK H10 Y(y) H1F H1132 ETX BCC
ASCII value H15 H3130 H59(79) H3146 H31313332 H03
9
Station number, commands, and register No. are the same as in computer request format.
9
BCC : When command is one of lower case(y), only one lower byte of the value resulted by adding 1 byte
each to ASCII values from NAK to ETX is converted into ASCII, added to BCC, and sent.
9
Error code is HEX and 2 bytes(ASCII code, 4 bytes), which indicates type of error. For the details, see
Appendix ‘B. Error Code Table’.
4) Example of use
In case reading of variable registered in registration No. 1 of station No.1 is executed, supposing that 1 block is
registered by named variable reading in data type of DINT.
(Computer request format)
Format
Name
Header Station No. Command Registration No Tail Frame check
Frame (Ex.) ENQ H01 Y(y) H01 EOT BCC
ASCII value H05 H3031 H59(79) H3031 H04