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Properties and functions
1.2 Further functions
Media redundancy (MRP)
Within an Ethernet network with a ring topology, the CM supports the media redundancy
protocol MRP. You can assign the role of "Client" or "Manager (Auto)" to the CM.
Addressable with the factoryset MAC address
To assign the IP address to a new CM (direct from the factory), it can be accessed using the
preset MAC address on the interface being used. Online address assignment is made in
STEP 7.
SNMP agent
The CM supports data queries using SNMP in version V1 (Simple Network Management
Protocol).
For details, see section SNMP (Page 47).
IP configuration - IPv4
The essential features of IP configuration for the CM:
• The CM supports the use of IP addresses according to IPv4.
• You can configure how and with which method the CM is assigned the IP address, the
subnet mask and the address of a gateway.
• The IP configuration and the connection configuration (IPv4) can also be assigned to the
CM by the user program (for program blocks refer to the section Program blocks
(Page 21)).
Note: Does not apply to S7 connections.
IP routing
The CM supports static IP routing (IPv4) to other CMs/CPs.
For details, see section IP routing (Page 39).
Access to the Web server of the CPU
Via the LAN interface of the CM, you have access to the Web server of the CPU. With the aid
of the Web server of the CPU, you can read out module data from a station.
Note the special description of the Web server; refer to the section Documentation references
(Page 65)
Note
Web server access using the HTTPS protocol
The Web server of a SIMATIC S7-1500 station is located in the CPU. For this reason, when
there is secure access (HTTPS) to the Web server of the station using the IP address of the CM
1542-1, the SSL certificate of the CPU is displayed.
12
Operating Instructions, 04/2023, C79000-G8976-C355-05
SIMATIC CM 1542-1
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