Variants Predefined PDO

Fixed-point representation of the load

The display of the load value can also be converted already in the terminal into a point representation. To do this the input PDOs are to be changed as follows:

Variants Predefined PDO 1: — Load value in fixed-point representation

Variable	Meaning
Value (Real)	calculated 32-bit fixed 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 IEC61131, this 32-bit variable can be linked directly with a FLOAT variable of the PLC, see “Bit – meaning of the variable value (REAL)”

Variable

Meaning

Value (Real)

calculated 32-bit fixed 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 IEC61131, this 32-bit variable can be linked directly with a FLOAT variable of the PLC, see “Bit – meaning of the variable value (REAL)”

Voltage measurement

The EL3356 can also be used as a 2-channel analog input terminal for voltage measurement, see Notes.

Variants Predefined PDO 2: — EL3356 process image for voltage measurement

Variable	Meaning
Underrange	Measurement is below range
Overrange	Measuring range exceeded
Error	Collective error display
TxPdo Toggle	Toggles 0->1->0 with each updated data set
Value	right-justified voltage value over the respective measuring range (range 0x80.00.00.00 ... 0 ... 0x7F.FF.FF.FF) Channel 1: Supply voltage Channel 2: Bridge voltage