LG GLOFA-GM Series, Руководство пользователя, Страница: 162 / 358

Chapter 7 Communication function
7-43
Direct variables available according to PLC type are as follows.
[Table 7.15] Type of direct variables
Type Bool Byte Word Double word Long word
GM1 %MX,%QX,%IX %MB,%QB,%IB %MW,%QW,%IW %MD,%QD,%ID %ML,%QL,%IL
GM2 %MX,%QX,%IX %MB,%QB,%IB %MW,%QW,%IW %MD,%QD,%ID %ML,%QL,%IL
GM3 %MX,%QX,%IX %MB,%QB,%IB %MW,%QW,%IW %MD,%QD,%ID -
GM4 %MX,%QX,%IX %MB,%QB,%IB %MW,%QW,%IW %MD,%QD,%ID -
GM6 %MX,%QX,%IX %MB,%QB,%IB %MW,%QW,%IW %MD,%QD,%ID -
GM7 %MX,%QX,%IX %MB,%QB,%IB %MW,%QW,%IW %MD,%QD,%ID -
Refer to technical spec. of GLOFA PLC for details to specify the area of each device in GLOFA GM.
Remark
[Note 1] Device data type of each block shall be surely identical. If the 1
st
block is WORD and the 2
nd
block is
DOUBLE WORD in data type, error occurs.
2) Response format(for PLC of ACK response)
Header
Station
No.
Command
Command
type
Number of
blocks
Number of
Data
Data Tail
Frame
check
Frame(Ex.) ACK H20 R(r) SS H01 H02 HA9F3
Repeated
block
ETX BCC
ASCII
value
H06 H3230 H52(72) H5353 H3031 H3032
H4139463
3
H03
1 block(Max. 4 blocks)
9
Station number, commands, type of command, and number of blocks are the same as in computer request
format.
9
BCC : When command is one of lower case(r), 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.
9
Number of data means Byte number of HEX. type and is converted into ASCII. This number is determined
according to memory type(X,B,W,D,L) included in direct variable name of computer request format.
FORMAT
NAME