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Properties / services
1.2 Communication services
1.2
Communication services
Supported communication services
The CP supports the following communication services:
● S7 communication and PG/OP communication with the following functions:
● Open communication services with the following functions:
● ERPC communication
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– PG functions (including routing)
– Operator control and monitoring functions (HMI)
Multiplexing PG/OP connections
– Client and server for data exchange via communication blocks on S7 connections
configured at both ends
Communication blocks: FB12, FB13, FB14, FB15, FB8, FB9, FC62
(see also STEP 7 online help or the manual "System Software for S7-300/400 System
and Standard Functions")
– Server for data exchange on S7 connections configured at one end only without
communication blocks on the S7300 / C7300 station
– SEND/RECEIVE interface over ISO-on-TCP, TCP and UDP connections
In UDP broadcast, only sending of frames is supported, not receipt.
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.
– Multicast over UDP connection
The multicast mode is made possible by selecting a suitable IP address when
configuring connections.
– FETCH/WRITE services (server; corresponding to S5 protocol) via TCP connections
The addressing mode can be configured for FETCH/WRITE access as the S7 or S5
addressing mode.
– LOCK/UNLOCK with FETCH/WRITE services
– Connection diagnostics from the user program
In conjunction with the software components of our cooperation partners
ILS Technology LLC, the CP supports ERPC communication. Frames are exchanged
between the S7 station and ERP subscribers using TCP/IP. The following methods are
available for data transfer:
– Write/read jobs
Data is read cyclically or spontaneously from the S7-CPU and sent to the ERP
subscribers or written to the CPU by the ERP subscribers.
– Event-oriented transmission, configured as a logical trigger and fires by the user
program on the CPU
When certain events occur, data is read from the CPU and sent to the ERP
subscriber.
Apart from software blocks for the logical trigger, no resources are required on the CPU
for ERPC communication.
CP 343-1 ERPC
Manual, 03/2010, C79000-G8976-C239-02
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