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Chapter 8 Communication Functions
8-12
③ For NAK response after execution of command(PC ← MASTER-K120S main Unit)
Format name Header Station No. Command Command type Error code Tail Frame check
Ex. of frame NAK H01 r SS
Error code (2 bytes)
ETX BCC
ASCII value H15 H3031 H72 H5353
Error code (4 bytes)
H03
2) Continuous reading(R(r)SB) of device
(1) Introduction
This is a function that reads the PLC device memory directly specified in accord with memory data type. With this, data is
read from specified address as much as specified continuously.
(2) PC request format
Format name Header
Station
No.
Command
Command
type
Device
length
Device
Number of data
(Max. 128 Bytes)
Tail
Frame
check
Ex. of frame ENQ
H10
R(r)
SB H06 %MW100 H05
EOT BCC
ASCII value H05
H3130
H52(72)
H5342 H3036 H254D57313030 H3035
H04
Remark
1) Number of data specifies the number to read according to the type of data. Namely, if the data type of device
is word and number is 5, it means that 5 words should be read.
2) Max. of %MW in number of data can be used up to 120(240bytes).
3) Protocol of RSB doesn't have number of blocks.
4) R(r)SB command of bit devices is not available.
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
(Length of
device name)
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 name
Address to be actually read is entered. This must be ASCII value within 16 characters, and in
this name, digits, upper/lowercase, and '%' only are allowable to be entered.