Horner APG XL4 OCS HE-ETN300 - Manual (Page 24)

CH.4 SUP0740-07
11/30/2009 Page 24 of 98 # 958
2. Select
the Ethernet from the Connection Medium list, and then set the Target IP Address
and Timeout parameters as follows:
Target IP Address: Enter the IP Address previously assigned to the target Ethernet Module.
Please refer to Chapter 3 regarding how to assign an IP Address to an Ethernet Module.
Timeout: Enter a number between 1000 and 65,000 (in milliseconds) for the maximum expected
network round-trip communication time. This value determines how long Cscape will wait for a
response after it sends a CsCAN over Ethernet protocol command to the Ethernet Module.
Note: For most local network applications, the default Timeout value of 1000 is sufficient.
However, there are some network considerations, which may require the Timeout
value to be increased to facilitate reliable communication. This includes heavily loaded
networks, complex networks with multiple levels of routers and switches, and Internet
communication.
Also, because CsCAN communication is affected by ladder code scan rate, the
Timeout value may have to be further increased to compensate for applications with
very slow scan rates.
4.3 CsCAN over Ethernet Operation
As stated previously, the Ethernet Module allows a CsCAN Host Programming Tool, such as
Cscape, to use CsCAN over Ethernet to perform all standard supervisory control, monitoring and
programming functions with the OCS, as though it were connected directly to the OCS
programming serial port.
These standard supervisory functions include the Ethernet Module’s ability to handle pass-
through communication with the CsCAN Nodes attached to the OCS CAN port. This feature is
known as CsCAN single-point programming. For example, referring back to Figure 1.1 (page
Figure
1.1– Example of an Ethernet Network ) the PC (running Cscape) can use OCS #1’s
ETN200 Module as a gateway, to easily access all of the CsCAN Nodes on OCS #1’s CsCAN
network.
4.4 CsCAN over Ethernet Downloading Precautions
When downloading a new Ethernet configuration to a target OCS, using CsCAN over Ethernet
protocol, extra care should be taken.
In particular, when downloading I/O and Network Configuration, the Ethernet Module
configuration is also downloaded, which has the potential to change the target device’s IP
Address, or it could even remove the Ethernet Module configuration entirely, resulting in loss of
communication and a failed download.
For this reason, when the Cscape user modifies the I/O Configuration, and then starts to
download it using CsCAN over Ethernet, Cscape issues a warning message, as shown in Figure
4.2.