Softing Echochange - S7 Protocol Settings; Echocollect Connection: Modbus Protocol

55Connection
Echochange - Manual / Connection
55
Type (active / passive)
Here, you can specify whether your own station will actively initiate the connection attempt or wait
passively for the partner station to establish the connection. Please make sure that different values
are selected on both sides of the connection. Usually, the PC will be parameterized as active. This is
the default.
Protocol
Using this option, you can specify whether frames on this connection will go to all devices
(Broadcast), whether a certain group of stations should be addressed (Multicast), whether a secured
connection will be used (Normal) or whether the data will be transmitted via an unsecured connection
(Datagram). Usually, you select “Normal” here.
Priority
The line priority can range from 0 (highest priority) to 4 (lowest priority). 0 and 1 are so-called express
priorities, 2 and 3 are normal priorities. Priority 4 is only used on rare occasions because it causes
the connection to be reestablished for each send transaction. On the other hand, if it is only used
intermittently, it puts less load on the network than the other priorities because the line will not be
monitored (the connection is closed after each send transaction). Please note that when using
express priorities, the transmission will not be faster than with normal priorities. For some PLCs,
however, the data will be transferred to the RAM using an interrupt if you select priority 0. This may
result in a faster overall data transmission. For priorities 0 and 1, the maximum data length is 16
bytes. Usually, Prio 3 is used here.
8.2.5 S7 Protocol Settings
Depending on the PLC family used, select S7 1200/1500, S7 300/400 or S7 200.
Changing the PLC family updates the TSAP settings with default values, as described in TSAP for
S7 Connections.
The Use Short TPDU setting is required for some S7-compatible PLCs. Only use this option if the
data exchange with the PLC does not work properly. This option may slow the communication.
8.2.6 echocollect Connection: Modbus Protocol
In this dialog box, you can edit the specific parameters for the connection to Modbus PLCs.
Description
Default
Name of the
Connection
This field displays the connection name which can be
changed here.
Slave address
The slave address entered here will be transmitted in the
Modbus frame.
1
Start Address 0
The starting address in the frame will be transmitted as
specified.
Yes
Start Address 1
Some Modbus devices expect a starting address in the
frame that is 1 less than the one you entered. The first
address is 1.
No
Use Byte Swap
Swaps the bytes within a word
Off
Use Word Swap
Swaps the words within a double word (32 bits)
Off
Use Write Single
Coil (05)
For writes, the Modbus opcode “Write Single Coil 05” is
used instead of “Write Multiple Coils 15”.
Off
Use Write Single
Register (06)
For writes, the Modbus opcode “Write Single Register 06”
is used instead of “Write Multiple Registers 16”.
Off
User Item Unit ID
The slave address will be indicated in the item syntax.
Example: Id2.R2
For more details, see Modbus Item Syntax
1