Specifications

CP143 TCP/IP firmware CP143 H1 / TCP/IP manual
4-20 Rev. 00/07
4.3.5 Structure of the PLC-header
The following messages lists the valid ORG identifiers. The entered "length" must never be -1
(FFFFh).
4.3.5.1 FETCH/WRITE
for WRITE
for READ
Request message
System identifier ="S"
="5"
Header length =16d
Ident. OP-code =01
OP-code length =03
OP-code =03
ORG-block =03
ORG-block length =08
ORG-identifier
DBNR
Start- H
address L
Length H
L
Unused block =FFh
Length unused bl. =02
Up to 64K data but only for error
No.=0
Acknowledgement message
System identifier ="S"
="5"
Header length =16d
Ident. OP-code =01
OP-code length =03
OP-code =04
Acknowl. block =0Fh
ACK-block length =03
Error No. =No.
Unused block =FFh
Length unused block =07
not used
Request message
System identifier ="S"
="5"
Header length =16d
Ident. OP-code =01
OP-code length =03
OP-code =05
ORG-block =03
ORG-block length =08
ORG-identifier
DBNR
Start- H
address L
Length H
L
Unused block =FFh
Length unused bl. =02
Acknowledgement message
System identifier ="S"
="5"
Header length =16d
Ident. OP-code =01
OP-code length =03
OP-code =06
Acknowl. block =0Fh
ACK-block length =03
Error No. =No.
Unused block =FFh
Length unused block =07
not used
Up to 64K data but only for error
No.=0