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09/02
• Reading out of the NPB memory area:
In the bytes 46 to 49 of the SM area currently being used for a CP 243-1, a
pointer is located at the memory area in which the configuration data of the CP
243-1 are stored. If you raise this pointer by 108, you fill find the NPB memory
area in which the TCP/IP configuration parameters currently being used by the
CP 243-1 are stored, provided the CP 243-1 was correctly configured and that
at least one cycle of the user program has been run through. The NPB does not
contain valid values if the configuration is faulty. The following table shows the
structure of these memory areas.
Byte offset in
variables
memory
108 - 109
110-113
114- 117
118-121
122-127
Table 14: Structure of NPB memory areas
• LED indicators (see Chapter 2.5)
Note
If there is a sudden termination of a CP 243-1 with active client connections (e.g.
due to power failure) while the server continues running, the server may not recog-
nize this interruption in the connection. If the client then attempts to reconnect, a
system-related waiting period equal to the configured Keep Alive time may arise,
beginning when the CP 243-1 is switched on again, until all connections are re-
established.
CP 243-1
J31069-D0428-U001-A1-7618
Meaning
Common flag byte
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:
Auto Negotiation not enabled
1:
Auto Negotiation enabled
Bit [3] BOOTP
0:
Network parameters from configuration
1:
Network parameters via BOOTP
Bit [4] - Bit [15]: Reserved
Current IP address
Current subnet mask
IP address of the Gateway currently in use
MAC address
Diagnostics
Format
2 bytes hex
4 bytes hex
4 bytes hex
4 bytes hex
6 bytes hex
59
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