Beckhoff EL3702, Documentation

Page: 139 / 181

Commissioning
EL37x2 139 Version: 3.5
es muss eine ARRAY-Variable vorliegen die über ADS erreichbar ist. Dies kann eine PLC-Variable oder eine
im System Manager definierte ARRAY-Variable sein. Diese wird dann vom Scope2 erkannt.
Summary: an array variable have to be provided which is reachable via ADS. This can be a PLC variable of
a POU or a defined array variable by the system manager or alternatively the ADS server of the terminals
device is just activated.
6.5 Process data and configuration
6.5.1 TwinCAT tree
The operating principle of the EL37x2 in conjunction with SYNC0 and SYNC1 pulses was already described
in section "Basic Function Principles". This section describes the application of the Beckhoff TwinCAT
System Manager for setting the parameters.
Once the terminal has been scanned in, the following tree structure appears (see Fig. TwinCAT tree
EL37x2 ).
Fig. 181: TwinCAT tree EL37x2
Ch1/Ch2 CycleCount and Ch1/Ch2 Value
Each EL37x2 record contains a CycleCounter for each channel that is incremented with each record, and n
analog measured values with a width of 2 bytes each. With an oversampling factor of n = 25 a record
therefore consists of a 16-bit CycleCounter (overflowing) and 25 16-bit samples per channel. The
CycleCounter in the higher-level control system can be used to verify the consistency of the record transfer.
By default the EL37x2 is set to n = 1, resulting in the process image shown in Fig. TwinCAT tree EL37x2 .
WcState 0/1 (Online tab)
Boolean variable indicating the working counter status of the terminal. An invalid working counter (value: 1)
is displayed if invalid data were transferred by the EtherCAT slave controller.