Serial Communications 3104
REC XXXXX 3-28
Example 1 :
The Host wants to receive the HIGH WEIGHT SET (address 7A hex) :
High weight set : 100.0 %
Address of Slave : 1
HOST (PLC)
SLAVE (3105)
02H 10H 01H 63H 01H 00H
7AH 00H 02H E1H 03H Æ
Å 02H 10H 01H 63H
01H 00H 7AH 00H
02H 42H C8H 00H
00H EBH O3H
3.7 Siemens 3964R
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.
3.7.1 Write Register
HOST (PLC) SLAVE (3104)
STX (02H) Æ
Å DLE (10H)
HEDING TEL HI (00H) Æ
HEDING TEL LO (00H)
COMMAND HI (41H)
COMMAND LO (44H)
DESTINATION DB (00H)
DESTINATION DW (XXH)
NUMBER BYTES HI (00H)
NUMBER BYTES LO (XXH)
no CF (FFH)
all CPUs (FFH)
DATA MSB
….
DATA LSB
DLE (10H)
ETX (03H)
BCC (XXH)
Å DLE (10H)
STX (02H)
DLE (10H) Æ
Å HEDING TEL HI (00H)
HEDING TEL LO (00H)
NOT USED (00H)
To Next Page
Loading...