WAGO 750 Series User Manual

180 • Application Examples
Example Program for a CGI Application
WAGO-I/O-SYSTEM 750
Linux Fieldbus Coupler
The function main_ether() calls the above-mentioned functions and writes
the HTML code to the standard console stdout. HTML shows the network
configuration in a form. The form has the SUBMIT button SAVE
CONFIGURATION which transfers a changed network configuration to the
Linux fieldbus coupler in a QUERY_STRING. You have to enter a user with
root privileges and the corresponding password.
These entries are authenticated in the crypt.c file. After successful
authentication, the SAVE CONFIGURATION query string is analyzed and, if a
value is changed, the appropriate write_...- function is called.
Source code description: restart.c
The restart page of the Linux fieldbus coupler is generated in the restart.c file.
The file includes the function
main_restart()
main_restart() writes the HTML code to the standard console stdout.
Furthermore, the query string including the password is analyzed. After
entering a user with root privileges and the corresponding password
(default:user name: root, password: wago) and clicking the REBOOT button,
reboot will be called which will reboot the operating system.

WAGO 750 Series Specifications

General

Protection Class	IP20
Bus Couplers	PROFIBUS, CANopen, Ethernet
Modules	Digital Input, Digital Output, Analog Input, Analog Output
Mounting	DIN rail mounting
Voltage Supply	24 V DC (typical)
Communication Protocol	Depends on the bus coupler (e.g., PROFIBUS, CANopen, DeviceNet, Ethernet)
Digital Input Channels	Varies by module (e.g., 8, 16 channels)
Digital Output Channels	Varies by module (e.g., 8, 16 channels)
Analog Input Channels	Varies by module (e.g., 2, 4, 8 channels)
Analog Output Channels	1, 2, 4 channels (depending on module)
Width	12 mm, 24 mm (typical module widths)
Number of Channels	Varies by module type
Current Consumption per Channel	Varies by module type