LG GLOFA-GM Series, Руководство пользователя, Страница: 178 / 358

Chapter 7 Communication function
7-59
Remark
[Note 1]
Refer to technical spec. of GLOFA PLC for details to specify the area of each device in GLOFA GM.
Ex.)
If the data type to write presently is DOUBLE WORD and the data to write is H12345678, its ASCII code converted
value is 3132333435363738, which shall be input in data area. Namely, the highest value shall be transmitted first
and the lowest last.
Remark
[Notes1] Device data type of each block shall be surely identical.
[Notes2] If data type is BOOL, data to write is indicated by one byte of HEX. Namely, if bit value is 0, it is indicated
by H00(3030) and if 1, it is indicated by H01(3031).
2) Response format(for PLC of ACK response)
Format
Name
Header Station No. Command Command type Tail Frame check
Frame (Ex.)
ACK H20 W(w) SS ETX BCC
ASCII value
H06 H3230 H57(77) H5353 H03
9
Station number, commands, and type of command are the same as in computer request format.
9
BCC : When command is one of lower case(w), 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 of NAK response)
Format
Name
Header Station No. Command
Command
type
Error code
(HEX 2 Byte)
Tail
Frame
check
Frame (Ex.)
NAK H20 W(w) SS H4252 ETX BCC
ASCII value
H15 H3230 H57(77) H5353 H34323532 H03
9 Station number, commands, and type of command are the same as in computer request format.
9 BCC : When command is one of lower case(w), 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.