Serial Communications 3101/3201
REC
XXXXX
3-36
3.6 Siemens
3964R
3.6.1 Description
The protocol has been implemented as described in – “Funzioni di accoppiamento
con CP 525/2 Manuale – Simatic S5” – Siemens.
Two communication modes are provided :
FETCH
The HOST asks the slave unit for register
SEND
The HOST sends registers to the slave
The choice between requesting or sending data is made using a specific code inside
the
message.
-
The Host (PLC) sends data to the Slave (3000) :
HOST (PLC)
SLAVE
(3000)
STX (02H)
Æ
Å
DLE
(10H)
Æ
HEADER HI
(00H)
HEADER LO
(00H)
COMMAND HI
(41H)
COMMAND LO
(44H)
DESTINATION DB
(00H)
DESTINATION DW
(XXH)
BYTE COUNT HI
(00H)
BYTE COUNT LO
(XXH)
no CF
(FFH)
all CPUs
(FFH)
DATA MSB
….
DATA LSB
DLE
(10H)
ETX
(03H)
BCC
(XXH)
Æ
Å
DLE
(10H)
Å
STX
(02H)
DLE (10H)
Æ
Å
HEADER HI
(00H)
HEADER
LO
(00H)
NOT
USED
(00H)
NUMBER
ERROR
(00H)
DLE
(10H)
ETX
(03H)
BBC
(XXH)
DLE (10H)
Æ
-
The Host (PC or PLC) asks for data from the Slave (3000) :
HOST (PLC)
SLAVE
(3000)
STX
Æ
Å
DLE
(10H)
Æ
Содержание Ramsey Micro-Tech 3000 Series
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