Open the configuration panel of Modbus/TCP
driver via the System management panel:
Figure: System management - Drivers tab
Click on the MODBUS driver
button. Configure the PLC (remote-control components) in the following
configuration panel. Configure each PLC (independent of the real
addressing). An internal data point of type _Mod_Plc
is created for each PLC (see also Internal
data points of the Modbus/TCP driver).
Figure: Configuration panel of
the Modbus/TCP driver
Create
Creates a new PLC data point with a sequence higher number,
e.g. if the last created PLC data point was _Mod_Plc_3, then
the name of the new data point is _Mod_Plc_4 and it has the
default configuration settings. Afterwards this can be configured.
Note that a configuration will apply only then, when the Apply button has been clicked.
For changing the configuration of a PLC data point choose
it from the combo box, change the configuration and click
on the Apply button to save
the new configuration.
Remove
Deletes the chosen data point after confirmation of the security
query dialog.
Active
Tick this check box in order to activate the connection to
the PLC. You can deactivate a device that is already created
and configured. The device (data point) is not deleted and
can be reactivated at any time. The status display changes
from "Connected" to "Not Active" if a
device is deactivated. If a connection has been deactivated,
the driver does not communicate with the corresponding PLC
anymore. So it is possible to prevent for example error messages
when a PLC is intentionally removed from the system.
PLC number
A specific number of the PLC for the driver (0-65535). This
number has to be unique in the system. The PLC number has
to be identical to the number in the data point name. In order
to create a new data point with a specific number, change
the number and click on Apply.
Unit address
Address of the slave or the Modbus unit (0-255). The unit address
is required if several PLCs hang on a LAN gateway with one
IP address. If a PLC has an own IP address, the unit address
should be set to 1. Up to 128 PLCs can be configured for one
IP address.
Modbus
transaction timeout
The timeout between the request and response in milliseconds
(100-100000). In case of timeout the request is lost and connection
closed. The connection will be re-established at the next
request.
Frame coding
The coding takes alternatively place with TCP (binary) or ASCII.
List of Hosts
Define the IP addresses/host names of the PLC or the gateways
to the PLC and port numbers for the TCP connections. Maximal
2 connections are allowed. If no port number is defined, the
value is set to 502 automatically.
Set Invalid
Bit
If the checkbox is checked, the invalid bit will be set whenever
the connection to the PLC is interrupted and the number of
attempts (defined with maxRetryNumber)
has been exceeded. The
connection is marked as dead. The invalid bit is set to all
input addresses (not output addresses) of the corresponding
PLC to which the connection has been lost (="Not connected"
status).
General Query
Clicking on this button triggers a general query to the PLC.
All data that is configured to polling is queried immediately
and the GQ bit of the DPE is set. Furthermore, spontaneous
data are let through to an address on the related device in
the next come in, no matter whether a low level comparison
or smoothing is activated. The Modbus/TCP driver does not
execute a general query when establishing a connection. The
query has to be triggered manually via the internal data point
_DriverCommon. The driver, however, executes a general query
at a redundancy switch.
 NOTE
If smoothing is activated, data from a general
query with same values is only let through, when the internal
driver data point "_DriverX.SM" (X is the Modbus manager
number) is set to 1.
NOTE
If your project is configured as a redundant
project, data from a general query with same values is only let
through by the event manager when the config entry "redOldNewComp"
in the event section of the "config.redu"-file is set
to 0.
Error
code
Number of the last driver error (see also Error
codes).
Sent requests
Number of requests sent to the PLC.
Rejected
requests
Number of invalid requests
received from the PLC.
Received
requests
Number of requests received from the PLC. Note that if the
driver is a pure master, the number of received requests remains
0 since no requests are received from the PLC.
State
Current connection state. The following states are possible:
Not connected (0),
Connected
(1), General Query
(2) and Not active
(3).
Redundant PLC
Choose this option if a redundant PLC exists.
List of Hosts (Redundant PLC)
Specify the IP addresses and port numbers for the TCP connections
of redundant PLCs (see also List
of Hosts above).
Unit Address (Redundant PLC)
Specify the unit or slave address of redundant PLCs.
Apply
By default the data points are created with standard configuration
settings. If the configuration has been changed, this has
to be saved by clicking the Apply
button.
Close
Closes the panel without applying the settings.
Help
Opens this page of the Online Help. |
