Communication Services - Siemens SIMATIC NET CP 442-1 RNA Equipment Manual

Application and functions

1.2 Communication services

① Connection to port X1P1 of the Ethernet interface (ISO transport)
② Connection of the RNA interface to a PRP network
③ Connection to port X2P1 of the RNA interface (ISO transport / ISO-on-TCP / TCP)
Figure 1-1 CP 442-1 RNA - connection variants
1.2 Communication services
Depending on the interface being used, the CP supports the following communications
services:
• S7 communication with the following functions:
– PG functions;
– Operator monitoring and control functions;
– Data exchange over S7 connections.
• Open communication services with the following functions:
– SEND/RECEIVE interface over ISO transport connections;
– SEND/RECEIVE interface over TCP connections, ISOonTCP and UDP connections;
– Multicast over UDP connection
– FETCH/WRITE services (server services; corresponding to S5 protocol) via ISO transport
– LOCK/UNLOCK with FETCH/WRITE services (CPUdependent; see section Requirements
12
With the SEND/RECEIVE interface via TCP connections, the CP supports the socket
interface to TCP/IP available on practically every end system.
UDP frame buffering on the CP can be disabled during configuration. When necessary,
this allows you to achieve a shorter reaction time between the arrival of a UDP frame
and its evaluation on the CPU.
The multicast mode is made possible by selecting a suitable IP address when
configuring connections.
connections, ISOonTCP connections and TCP connections;
Here, the SIMATIC S7400 with the CP is always the server (passive connection
establishment) while the fetch or write access (client function with active connection
establishment) is always initiated by a SIMATIC S5 or a device from another range / PC.
for use (Page 25));
Equipment Manual, 03/2022, C79000-G8976-C318-05
CP 442-1 RNA