Real-time Ethernet with Fast-ADS
The Fast ADS protocol is based on Ethernet. In combination with TwinCAT, this bus system has real-time capability and reaches cycle times of < 1 ms. The real-time Ethernet driver was developed for Windows 2000, Windows XP and Intel Ethernet chips.
Further information can be found at:
www.beckhoff.com/media/downloads/information-media/pc-control/pcc_0202_e.pdf
BK9000
The Fast-ADS protocol is implemented in addition to the already existing protocols on the BK9000 from firmware version B8. Simultaneous utilization is only possible, if the function ADS was selected in the System Manager (IP address tab). If the NoRealTimeFlag function is not selected, communication can only take place via Fast-ADS.
With Fast-ADS the watchdog is set to 100 ms. If it is triggered (e.g. when TwinCAT stops), all other Ethernet services are usable again. The K-bus works synchronous with the Fast ADS.
B900
RT-Ethernet or Fast-ADS is implemented on all B900 modules. The cycle time of the TwinCAT task must be shorter than 10 ms. Otherwise the process image and thus the outputs of the module and the connected extensions will be reset after 10 ms.
Settings in the System Manager
BK9000 tab
No Real Time Flag
TCP/IP or UDP telegrams can also be received if the checkbox is activated. However, the jitter of the real-time telegrams increases!
K-bus reset
A reset is triggered on the K-bus.
Data Exchange
The number of task cycles after which a telegram should be sent to the fieldbus station (Bus Coupler / Fieldbus Box) is determined here.
Modulo specifies the task in which the telegram should be dispatched. This enables the system performance to be optimized.
Sample: Divider 5 and Modulo 3 – a telegram is sent after every 5th task (the third to be specific).
VLAN
Switches that support VLAN (virtual LANs) can prioritize the incoming telegrams with this.
IP address tab
Host Name
The name of the fieldbus station (Bus Coupler / Fieldbus Box) can be edited here.
IP Address
The IP address of the fieldbus station (Bus Coupler / Fieldbus Box) must be entered here.
GetHostByName
Using this button an IP address can be obtained from a DHCP server (Dynamic Host Configuration Protocol Server) (BK9000: from firmware version B2).
Set IP Address
Using this button the IP address is set via ARP.
AMS address
Specifies the AMS-Net ID of the fieldbus station (Bus Coupler / Fieldbus Box). It is generated automatically by appending two additional byte values (".1.1") to the IP address.
BootP
This checkbox can be activated if the Beckhoff BootP server has been installed and started (as from TwinCAT Version 2.8).
New MAC Addresses
If the Beckhoff BootP server has started, the new MAC addresses (Media Access Controller addresses) can be displayed by pressing this button.
The new addresses are displayed in the field under the button.
If only one fieldbus station has been connected, then accordingly only one new MAC address will be displayed.
A desired IP address can then be assigned to this MAC address in the IP Address field described above.
If further fieldbus stations are then connected, you can repeat this procedure on the IP Address tabs for these stations.
Communication Settings
Settings for communication via ADS or RAW.