27PLC Connections
Echochange - Manual / PLC Connections
27
The read connection needs to be parameterized on both sides of the communication (Fetch
active connection in the OPC server, Fetch passive connection in the S5).
Write (Write active):
If you want to write data to the S5 PLC as well, a write connection needs to be established
besides the read connection. When using S5 via TCP/IP or via AS511, a single connection
may be used for this purpose.
For the write connection, a write port or a write TSAP must be specified.
The write connection needs to be parameterized on both sides of the communication (Write
active connection in the echo device, Write / Receive passive connection in the S5).
Newer S5 TCP/IP cards and echo devices support reading and writing over a single
connection.
5.3 Modbus – General Information
The Modbus over TCP protocol is used for the communication with PLCs from Wago,
Groupe Schneider, Beckhoff and all CPs capable of using the Modbus over TCP protocol
(Modicon, Ethernet terminals from Phoenix, Wago, Beckhoff and many more).
The Modbus protocol only works in conjunction with TCP/IP.
Read (Fetch active) and Write (Write active):
When communicating with Modbus PLCs, it is generally possible to both read and
write data over a single connection.
If default port 502 is used, you only need to parameterize the connection on the
echo device side. On the PLC side, no other settings are required.
5.4 CLX – General Information
The CLX protocol is used for the communication with ControlLogiX / Compact Logix
PLCs from Rockwell Automation.
The CLX protocol only works in conjunction with TCP/IP.
Read (Fetch active) and Write (Write active):
When communicating with CLX PLCs, it is generally possible to both read and
write data over a single connection.
If default port 44818 is used, you only need to parameterize the connection on
the echo device side. On the PLC side, no other settings are required.
NOTE:
To address item IDs, you need to specify their symbolic names in the CLX.
Alias browsing:
Once the CLX connection has been established, symbol information will be read from
the PLC and displayed for selection in the corresponding dialog boxes.
5.5 PLC-5 / SLC – General Information
This protocol is used for the communication with PLC-5 and SLC PLCs from Rockwell
Automation Allen-Bradley.
The PLC-5 / SLC protocol only works in conjunction with TCP/IP.
We do not support the SLC firmware version which uses the function codes A2 and AA.
In such cases a firmware update of the SLC is recommended.
Read (Fetch active) and Write (Write active):
When communicating with SLC or PLC-5 PLCs, it is generally possible to both read
and write over a single connection.
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