STEP5 可编程控制器AS511通讯协议

STEP5 可编程控制器AS511通讯协议
input: - block number
output: - initial address of DW0 in AG


PG AS
(hex) (hex)
---------------------- function start --------
02 ----> STX
<---- 10 DLE
<---- 06 ACK
1A ----> B_INFO function code = 1Ah
<---- 02 STX
10 ----> DLE
06 ----> ACK
<---- 16 AG answer=16h
<---- 10 DLE
<---- 03 ETX
10 ----> DLE
06 ----> ACK
---------------------- header info --------
01 ----> ID=01h for Datablock
XX ----> DB number (0..255)
10 ----> DLE
04 ----> EOT
<---- 10 DLE
<---- 06 ACK
---------------------- data --------
<---- 02 STX
10 ----> DLE
06 ----> ACK
<---- 00 NUL
<---- XX DB initial address
<---- XX
<---- 70 synchronization code: 70 70
<---- 70
<---- 41 block ID and DB number : 41 XX
<---- XX
<---- XX PG ID code: XX XX
<---- XX
<---- XX library number: XX XX
<---- XX
<---- XX block length (words): XX XX
<---- XX
<---- 10 DLE
<---- 03 ETX
10 ----> DLE
06 ----> ACK
---------------------- terminate --------
<---- 02 STX
10 ----> DLE
06 ----> ACK
<---- 12 AG "end of transmission" code: 12h
<---- 10 DLE
<---- 03 ETX
10 ----> DLE
06 ----> ACK

//////////////////////////////////////////////////////////////////////////////

DB_READ
input: - initial address in AG
- final address in AG
output: - contents of datawords



PG AS
(hex) (hex)
---------------------- function start --------
02 ----> STX
<---- 10 DLE
<---- 06 ACK
04 ----> DB_READ function code = 04h
<---- 02 STX
10 ----> DLE
06 ----> ACK
<---- 16 AG answer=16h
<---- 10 DLE
<---- 03 ETX
10 ----> DLE
06 ----> ACK
---------------------- header info --------
XX ----> initial address in AG: XX XX
XX ---->
XX ----> final address in AG: XX XX
XX ---->
10 ----> DLE
04 ----> EOT
<---- 10 DLE
<---- 06 ACK
---------------------- data --------
<---- 02 STX
10 ----> DLE
06 ----> ACK
<---- 00 NUL
<---- 00 NUL
<---- 00 NUL
<---- 00 NUL
<---- 00 NUL
<---- XX first byte of data
<---- XX
<---- XX
. . .
. . .
<---- XX
<---- XX
<---- XX last byte of data
<---- 10 DLE
<---- 03 ETX
10 ----> DLE
06 ----> ACK
---------------------- terminate --------
<---- 02 STX
10 ----> DLE
06 ----> ACK
<---- 12 AG "end of transmission" code: 12h
<---- 10 DLE
<---- 03 ETX
10 ----> DLE
06 ----> ACK


//////////////////////////////////////////////////////////////////////////////

DB_WRITE
input: - initial address in AG
- contents of datawords
output: - none



PG AS
(hex) (hex)
---------------------- function start --------
02 ----> STX
<---- 10 DLE
<---- 06 ACK
03 ----> DB_WRITE function code = 03h
<---- 02 STX
10 ----> DLE
06 ----> ACK
<---- 16 AG answer=16h
<---- 10 DLE
<---- 03 ETX
10 ----> DLE
06 ----> ACK
---------------------- header info --------
XX ----> initial address in AG: XX XX
XX ---->
---------------------- data --------
XX ----> first byte of data
XX ---->
XX ---->
. . .
. . .
XX ---->
XX ---->
XX ----> last byte of data
10 ----> DLE
04 ----> EOT
<---- 10 DLE
<---- 06 ACK
---------------------- terminate --------
<---- 02 STX
10 ----> DLE
06 ----> ACK
<---- 12 AG "end of transmission" code: 12h
<---- 10 DLE
<---- 03 ETX
10 ----> DLE
06 ----> ACK

AS511的通讯与日系PLC的通讯有较大的差别，如FX的它是发送方一帧内容＋校验一次送完过去，然后接收方按相同的协议应答，也是回答一帧内容＋校验码过去。
AS511则是采用一问一答的方式。形象一点来说，FX的PLC与上位机通讯是问一句答一句。S5则是问一个字答一个字。
PG 　　　　　　AS
(hex) (hex)
---------------------- function start --------
02 ----> STX　　　　　　＊PG或PC向PLC发送报头
<---- 10 DLE　　　　　　＊PLC收到报头后，回应
<---- 06 ACK
1A ----> B_INFO function code = 1Ah　　＊PG或PC发送这句报文的命令码
<---- 02 STX　　　　　　　　　　　　　＊PLC收到命令码后，回答报文的报头开始02　　　　　　　
10 ----> DLE　　　　　　　　　　　　　＊PG或PC收到报头后，回应。。。

。。。。（略）