VIPA CP143 TCP/IP, Manual

Page: 65 / 210

CP143
H1 / TCP/IP manual
The CP143 H1 / TCP/IP network board
Rev. 00/07 4-17
4.3.3.2 The relationship between the ethernet ADR for H1 and the IP-ADR for TCP/IP
The CP 143 TCP/IP has a default ethernet address after it was turned on for the first time or after it
has been reset. This address is supplied as “Node Address” on the “test report” that accompanies the
module.
You can determine the IP address from the ethernet address by means of the following calculation:
Fig. 4-6: Conversion of ethernet address into an IP address
The remote IP address is the address of the destination module. This is a 32-bit address that must be
unique within the network. The address consists of 4 numbers that are separated from each other by
a full stop.
4.3.3.3 Broadcast
The broadcast address is always 255.255.255.255.
4.3.3.4 block size
Every configured interface of the CP must be synchronized by the handler module SYNCHRON
when a PLC is started. This applies to every type of start-up of the respective PLC:
•
OB20 for a new start
•
OB21 for a manual re-start
•
OB22 for a re-start after a mains power failure
block size CP block size in bytes
1
0 Default block size for a CPU. This may differ,
depending on the type of CPU.
1 16
2 32
3 64
4 128
5 256
6 512
255 512
Tab. 4-5: block size
1)
The first transfered block for the READ/WRITE function is 16 Bytes (length of READ/WRITE
Header) shorter as the set block length.