Siemens SIMATIC NET CP 243-1 User Manual

Configuration 09/02
CP 243-1
38 J31069-D0428-U001-A1-7618
4.4.2 Structure of the Configuration Data Blocks (CDB)
The CDB is generated by the Ethernet Wizard in STEP 7 Micro/WIN 32. The fol-
lowing table shows the structure of the CDB.
Byte offset in
variables mem-
ory
Description Data format Example
Header
0-4 Module name 5 bytes ASCII 16#4350323433
“CP243”
5-6 Length of CDB 2 bytes hex 16#006C
(108 decimal)
7-8 Length of NPB 2 bytes hex 16#0014
(20 decimal)
General information
9 Internal use 1 byte hex
10 Internal use 1 byte hex
11-12 Reserved for STEP 7 Micro/WIN 2 bytes hex ---
13-14 Common Flag
Bit [0] Duplex Mode
0: Half Duplex
1: Full Duplex
Bit [1] Data Rate
0: 10 Mbit/s
1: 100 Mbit/s
Bit [2] Auto Negotiation
0: No auto negotiation
1: Auto negotiation
Bit [3] BOOTP
0: Use configured network pa-
rameters
1: BOOTP
Bit [4-7] Not in use
Bit [8-15] CRC validation
16#00 CRC check enabled
16#AC CRC check disabled
2 bytes hex 16#0004:
Auto negotiation,
use configured net-
work parameters,
CRC check enabled
16#AC04:
Auto negotiation,
use configured net-
work parameters,
CRC check disabled
15-18 Configured IP address
This field should be set to
16#00000000 if BOOTP is used.
4 bytes hex 192.12.45.23:
16#C00C2D17
19-22 Configured subnet mask
This field should be
4 bytes hex 255.255.255.0:
16#FFFFFF00

Siemens SIMATIC NET CP 243-1 Specifications

General

Brand	Siemens
Model	SIMATIC NET CP 243-1
Category	Computer Hardware
Language	English