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Diagnostics and upkeep

5.3 Replacing a module without a programming device

CP 1543-1

56 Operating Instructions, 05/2017, C79000-G8976-C289-07

5.3

Replacing a module without a programming device

General procedure

The configuration data of the CP is stored on the CPU. This makes it possible to replace this

module with a module of the same type (identical article number) without a PG.

Note

Configured MAC address is adopted

When setting the ISO protocol, remember that MAC address set previously during

configuration is transferred by the CPU to the new CP module.

Module replacement: Special feature of IP address assignment from a DHCP server (IPv4)

During configuration of the CP you can specify the IP configuration in the properties dialog;

one option is to obtain the IP address from a DHCP server.

Note

Recommendation: Configuring a client ID

When replacing modules, remember that the factory

set MAC address of the new module is

different from the previous module. When the factory

set MAC address of the new module is

sent to the DHCP server, this will return either a different or no

IP address.

Ideally, you should therefore configure IP as follows:

•

Always configure a client ID and configure your DHCP server accordingly. This makes

sure that after replacing the module, you always obtain the same IP address from the

DHCP server.

If, in exceptional situations, you have configured a new MAC address instead of the MAC

address set in the factory, the configured MAC address will always be transferred to the

DHCP server. In this case, the new CP also has the same IP addre

ss as the previous

module.

Siemens CP 1543-1 User Manual

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