Web Server (Lighttp); Ntp Client - WAGO -I/O-IPC-C6 Manual

WAGO-I/O-SYSTEM 750
758-874/000-131 WAGO-I/O-IPC-C6
14.7.5

Web Server (lighttp)

Lighttp is a program under GPL and is especially characterized by its speed. The
configuration relies on the Apache web server and can therefore be simply
configured. PHP5 support is also available to the web server, which is already
used for the WBM web pages.
The I/O-IPCs web server is activated when delivered. It provides a graphic
interface through Web-Based Management by which you can configure the I/O-
IPC. For this, see section „Configuration via Web-Based Management (WBM)".
The already stored web pages can be found in the directory /var/www. In the
directory /var/www/cgi-bin/ is a CGI parser that enables the creation of dynamic
web pages. Examples using the CGI parser can be found in the directory
/var/www/wbm and implement WBM for the configuration of the I/O-IPC.
14.7.6

NTP Client

An NTP client functionality is provided for the I/O-IPC through the program
ntpclient. With NTP, the time can be requested from a remote NTP server through
port 123.
If NTP servers are activated in the Internet, routing and firewalls must be suitably
configured. In NTP, the time is transmitted as a 64-bit value and has a resolution
of about 0.25 ns. The precision of the time transmission is given as +/-10 ms in
the Internet and up to +/-200 μs in local networks.
The configuration and activation / deactivation of the NTP client is done through
WBM.
Manual
Version 1.0.0
Operating System 195