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Configuration
4.4.2
Structure of Configuration Data Block (CDB)
The CDB is created by the Internet wizard in STEP 7 Micro/WIN 32. The structure
of the CDB is shown below in the following table.
Byte Offset
in Variable
Memory
Header
0-4
Module name
5-6
Length of the CDB
7-8
Length of the NPB
General information
9
Internal system use
10
Internal system use
11-12
Reserved for STEP 7 Micro/WIN 32
13-14
Common flag
Bit [0] Duplex mode
Bit [1] Data rate
Bit [2] Auto negotiation
Bit [3] BOOTP
Bit [4-7] Not used
Bit [8-15] CRC validation
15-18
Configured IP address
This field should be set to
16#00000000 when BOOTP is being
used.
19-22
Configured subnet mask
This field should be set to
70
Description
0: Half duplex
1: Full Duplex
0: 10 Mbit/sec
1: 100 Mbit/sec
0: No auto negotiation
1: Auto negotiation
0: Use configured network pa-
rameters
1: BOOTP
16#00 CRC check activated
16#AC CRC check deactivated
Data Format
5 bytes, ASCII
16#4350323433
"CP243"
2 bytes, hex
16#006C
(108, decimal)
2 bytes, hex
16#0014
(20, decimal)
1 byte, hex
1 byte, hex
2 bytes, hex
2 bytes, hex
16#0004:
Auto negotiation
Use configured net-
work parameters
CRC check activated
16#AC04:
Auto negotiation
Use configured net-
work parameters
CRC check activated
4 bytes, hex
192.12.45.23:
16#C00C2D17
4 bytes, hex
255.255.255.0:
16#FFFFFF00
J31069-D0429-U001-A0-7618
03/03
Example
CP 243-1 IT
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