Beckhoff ELX3351, Operating Manual

Page: 56 / 71

Parameterization and programming
ELX3351 56 Version: 1.3.1
Fig. 47: ELX3351 - Default process image
Note regarding ELX3351: No switching of SampleMode in the Ctrl word
Function of the variables
Variable Meaning
Status The status word (SW) is located in the input process image, and is transmitted from terminal to the controller. For expla-
nation see the entries in the
object overview, index 0x6000 [ } 61] see " Bit - meaning of the status word [ } 57] "
Value calculated 32-bit DINT load value in unit [1], with sign
Value (Real) calculated 32-bit floating point REAL load value with mantissa and exponent in unit [1]
The format matches the REAL format of IEC 61131-3, which in turn is based on the REAL format of IEC 559. A REAL
number (single precision) is defined as follows (See also
Beckhoff InfoSys: TwinCAT PLC Control: standard data types ).
According to IEC 61131, this 32-bit variable can be linked directly with a FLOAT variable of the PLC, see " Bit - meaning
of the variable value (REAL) [ } 57] "
WcState cyclic diagnostic variable; "0" indicates correct data transmission
Status State of the EtherCAT device; State .3 = TRUE indicates correct operation in OP
AdsAddr AmsNet address of the EtherCAT device from AmsNetId (in this case: 192.168.0.20.5.1) and port (in this case: 1003)
Ctrl The control word (CW) is located in the output process image, and is transmitted from the controller to the terminal. For
explanation see the entries in the
object overview, index 0x7000 [
}
61] see " Bit - meaning of the control word [
}
57] "
See also the example program for the dissection of the Status and CTRL variable.