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Chapter 8 Communication Functions
8-26
7) Reading PLC Status(RST)
(1) Introduction
This is a function that reads flag list including operating status of PLC and error information.
(2) PC request Format
Format name Header Station No. Command Command type
Tail Frame check
Frame (Example)
ENQ H0A R(r) ST EOT
BCC
ASCII value H05 H3041 H52(72) H5354 H04
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.
(3) Response Format (ACK response)
Format name Header Station No. Command
Command
type
PLC status data
(Hex 20 Byte)
Tail
Frame
check
Frame (Example)
ACK H0A R(r) ST Status data Format ETX
BCC
ASCII value H06 H3041 H52(72) H5354 [
※
1] H03
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 ACK to ETX is converted into ASCII and added to BCC, and sent.
※1 PLC status data: data Format is 20 bytes in hex Format and converted into ASCII code. Its contents are constituted as
below table after converting ASCII code into hex data.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
Null CPU Ver. CPU null connection Null
Type No. Mode
•
CPU Type
CPU Type K120S K80S K200SA K200SB K200SC K300S K1000S
Code 42 41 3A 3B 3C 33 32
•
Version No.
Ex) Bit
0 0 0 1 0 0 1
0
•
CPU Mode • Connection
Ex) Bit Ex) Bit
- - - 0 0 0 0 -
Bit 1 Bit 2 Bit 3 Bit 4 Bit 0 Bit 1
Stop
Mode
Run
Mode
PAUSE
Mode
DEBUG
Mode
Local
connection
Remote
connection
- - - - - - 0 0
Version 1.2