WAGO 750 Series User Manual

132 • Process Image
WAGO-I/O-SYSTEM 750
Linux Fieldbus Coupler
• ioctl(iFD, IOCTL_CHANGE_UPDATE_SPEED, ulValue)
[ulValue from 1-10 is valid]
Used to set the polling interval to poll ioctl(iFD, IOCTL_KBUSUPDATE,
&ulTmp
. The default value is 3. This value can be reduced to 1 in order to
achieve the highest possible speed of the application. However, this only
makes sense with very fast I/O modules and a very small user program.
The value can also be increased to 10 if only very slow analog I/O
modules are involved and fast updates of the process image are not
desired.
• close(iFD)
Closes the KBus driver
Using predefined structures, it is possible to access the input or output process
image byte by byte via the following lines:
pstPabIn->uc.Pab[byteNo]
pstPabOut->uc.Pab[byteNo]
or word by word via the lines:
pstPabIn->us.Pab[wordNo]
pstPabOut->us.Pab[wordNo]
Before the input process image can be analyzed, ioctl(iFD,
IOCTL_KBUSUPDATE,...)
must be called. After changing the output process
image, it is also required to call ioctl(iFD, IOCTL_KBUSUPDATE,...) in
order to send the new values to the modules.

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