Control Requirement - Leuze electronic DDLS 538 S2 Series Original Operating Instructions

EtherCAT
NOTICE
The factory setting of the MAS EtherCAT configuration may only be changed on devices with an
operating range of 40 m or 120 m (DDLS 538 40.x S2 ... or DDLS 538 120.x S2 ..., respec-
tively).
NOTICE
For devices with the 200 m operating range (DDLS 538 200...), the factory setting of the MAS
EtherCAT configuration must not be changed.
For devices with the 200 m operating range, the device with "Frequency F4" must always be
installed on the master side.
7.4

Control requirement

Cycle times for PLC or NC
NOTICE
When using the DDLS 538 ... S2 ..., the cycle time of the PLC or NC must not fall below a mini-
mum value.
After each program cycle, the PLC or NC sends an EtherCAT telegram.
The number of telegrams sent within a specified time is, thus, dependent on the program cycle time of the
control.
• The PLC or NC monitors the network communication and increments an error counter (Lost Frames)
for faulty telegrams or telegrams that are not received.
• If, as the result of operationally related interruptions of the data transmission path, multiple successive
faulty or unreceived telegrams are registered, the Lost Frames counter threshold of the EtherCAT mas-
ter is incremented.
• After a defined Lost Frames counter threshold is reached, the control ceases communication in the net-
work.
As a result, the Operational operating state of the EtherCAT master is deactivated.
• The EtherCAT master then cyclically attempts to reinitialize the connection.
• The Lost Frames error counter is reset on each telegram received without error.
NOTICE
If a defined value of the Lost Frames counter is exceeded, the EtherCAT master exits the Oper-
ational operating state.
Depending on the supplier, the defined values of the Lost Frames counter may be different or
can also be configured and adapted to the application.
Minimum cycle time when using a DDLS 538 ... S2 ...
The following factors are decisive for the calculation of the minimum permissible cycle time of a PLC or NC:
• The value of the Lost Frames counter for a PLC is normally set to > 10 in the PLC master.
• The value of the Lost Frames counter for an NC is normally set to > 3 in the NC master.
• In the event of operationally related interruptions of the DDLS 538 ... S2 ..., signaling of the interruption
may be delayed by up to 5 ms.
Leuze electronic GmbH + Co. KG DDLS 538 ... S2 ... 55