Softing Echochange - Siemens PLC Protocols

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PLC Connections
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Echochange - Manual / PLC Connections
5 PLC Connections
This chapter covers the following topics:
S7 – General Information
S5 – General Information
Modbus – General Information
CLX – General Information
PLC-5 / SLC – General Information
MELSEC-Q – General Information
Send / Receive – General Information
OPCpipe – General Information
5.1 S7 – General Information
The S7 protocol is used to communicate with S7 PLCs and with CPs capable of using the S7
protocol.
The S7 protocol can be used in conjunction with TCP/IP, H1, or MPI.
Read (Fetch active) and Write (Write active)
When communicating with S7 PLCs, it is generally possible to both read and write
data over a single connection.
Usually, the parameterization of the S7 protocol is based on RFC 1006.
Besides the S7 PLC address (IP address or MAC address), a read and write TSAP
is required. When using MPI, enter the MPI address of the CPU.
To read and write data from and to an S7 PLC (layer 7 communication), the
following can be used:
- non-parameterizable connections
- parameterizable connections
Non-parameterizable connections
A connection will only be established on the echo side and NOT on the PLC side.
Default connections are required that are handled via standard TSAPs or default ports.
Only a limited number of default connections are available. If these are not sufficient, you need to use
a “parameterizable connection".
Default connections with Siemens CPs are handled via RFC 1006 or H1 (see Standard TSAPs and
TSAP for S7 Connections).
Parameterizable connections
The connection must be parameterized on both sides of the communication (one Fetch/Write active
connection on the echo side AND one Fetch/Write passive connection in the S7 CP)
If you use echolink for the communication, parameterizable connections are required.
5.2 S5 – General Information
The S5 protocol is used to communicate with S5 PLCs (S5 AP headers) and with CPs
capable of using the S5 protocol.
The S5 protocol can be used in conjunction with TCP/IP, H1 or for serial communication
with AS511.
Read (Fetch active):
To read data actively from an S5 PLC, you need to establish a read connection in the echo
device.
Besides the S5 PLC address (IP address or MAC address), a read port or a read TSAP must
be specified.