User manual

IEC61131 User and Reference Manual
April 22, 2008
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The Attempts parameter specifies the number of times to send a command to the controller
before giving up and reporting this failure to the host application. Valid values are 1 to 20.
The default value is 3 attempts.
The Host Network Details grouping contains information about the IP network including the
target‟s IP address or name, and the TCP port number on which it is listening. More details
on these below.
IP Address / Name
The IP Address / Name parameter specifies the Ethernet IP address of the target RTU, or a
DNS name that can be resolved to an IP address. The default value is blank. 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 TCP Port No. field specifies the TCP port of the remote device. Valid values are 0 to
65535. The default value is 20000.
 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 Page
Advanced parameters are used to set the Master Station address and 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.