The Internet Control Message Protocol (ICMP) allows the higher
protocol layers to detect error states on the network layer and
optimize the transmission of data packets.
Message types of Internet Control Message Protocol (ICMP)
supported by the CPU module:
▪ No ICMP Responses
All the ICMP commands are deactivated. This ensures a high
degree of safety against potential sabotage that might occur
over the network.
▪ Echo Response
If Echo Response is activated, the node responds to a ping
command. It is thus possible to determine if a node can be
reached. Safety is still high.
▪ Host Unreachable
Not important for the user. Only used for testing at the
manufacturer's facility.
▪ All Implemented ICMP Responses
All ICMP commands are activated. This allows a more detailed
diagnostics of network disturbances.
Default value: Echo Response
Table 15: Configuration Parameters, Module Tab
4.3.2 The Routings Tab
The Routings tab contains the routing table. This table is empty if the module is new. A
maximum of 8 routing entries are possible.
Target IP address of the communication partner (with direct host routing) or
network address (with subnet routing).
Range of values: 0.0.0.0…255.255.255.255
Default value: 0.0.0.0
Define the target address range for a routing entry.
255.255.255.255 (with direct host routing) or subnet mask of the addressed
subnet.
Range of values: 0.0.0.0…255.255.255.255
Default value: 255.255.255.255