User manual

IEC61131 User and Reference Manual
April 22, 2008
80
The Station parameter sets the target station number. The valid range is 1 to 255 if standard
addressing is used, and 1 to 65534 if extended addressing is used. The default is 1.
The Timeout parameter sets the length of time, in seconds, to wait for a response from the
controller before retrying (see Attempts), or ultimately failing. Valid entries are 1 to 255. The
default is 3.
The Attempts parameter sets number of times to send a command to the controller before
giving up and reporting this failure to the host application. Valid entries are 1 to 20. The
default is 3.
The Host Network Details grouping contains entries for the host‟s IP address or name and
the TCP port on which it is listening.
The IP Address / Name entry specifies the Ethernet IP address in dotted quad notation, or a
DNS host name that can be resolved to an IP address, of the PC where the ClearSCADA
server is installed. The following IP addresses are not supported and will be rejected:
 0.0.0.0 through 0.255.255.255
 127.0.0.0 through 127.255.255.255 (except 127.0.0.1)
 224.0.0.0 through 224.255.255.255
 255.0.0.0 through 255.255.255.255.
The UDP Port No. field specifies the UDP port of the remote device. Valid values are 0 to
65535. The default value is 49152.
 Click Restore Defaults to restore default values to all fields on this page, except for the
IP Address / Name field. The content of this field will remain unchanged.
Advanced Parameters
Advanced parameters are used to control the message size for the protocol. Control over
message length is needed when writing large amounts of data over certain communication
networks. A larger value can improve communication speed but can increase the number of
failed transmissions. A smaller value can reduce the number of failed transmissions but may
reduce throughput. When the Advanced tab heading is clicked the Advanced dialog is
opened as shown below.