Chapter8 Communication Function
8-19
4) Continuous writing of device(WSB)
(1) Introduction
This is a function that directly specifies PLC device memory and continuously writes data from specified address as much
as specified length.
(2) Request format
Format
name
Header
Station
No.
Comman
d
Comma
nd type
Device
Length
Device
Number of data
(Max.128 Byte)
Data
Tail
Frame
check
Frame
(Example)
ENQ H100 W(w) SB H06 %MW100
H02 H11112222
EOT BCC
ASCII
value
H05 H3130 H57(77) H5342 H3036
H254D57
313030
H3032
H31313131
32323232
H04
Remark
1)
Number of data specifies the number according to the type of device. Namely, if the data type of
device is WORD, and number of data is 5, it means that 5 WORDs should be written.
2) Number of data can be used up to 64.
Item
Explanation
BCC
When command is lowercase(r), only one lower byte of the value resulted by adding 1 Byte
each to ASCII values from ENQ to EOT is converted into ASCII and added to BCC.
Device
length(Name length
of variable)
This indicates the number of name's characters that means device, which is allowable up to
16 characters. This value is one of ASCII converted from hex type, and the range is from
H01(ASCII value:3031) to H10(ASCII value:3130).
device
Address to be actually read. This must be ASCII value within 16 characters, and in this
name, digits, upper/lower case, and '%' only are allowable to be entered.
Remark
1) Protocol of WSB doesn't have the number of blocks.
