Default process image
The default process image is standard (INT32).
Note regarding EL3356: 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 explanation see the entries in the object overview, index 0x6000 see “Bit - meaning of the status word” |
Value | calculated 32-bit DINT load value in unit [1], with sign |
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 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)” |
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 see “Bit - meaning of the control word” |
See also the example program for the dissection of the Status and CTRL variable.
Bit - meaning of the “status word”
Bit | SW.15 | SW.14 | SW.13 | SW.12 - SW.9 | SW.8 | SW.7 | SW.6 | SW.5 - SW.4 | SW.3 | SW.2 | SW.1 | SW.0 |
Name | TxPDO Toggle | - | Sync Error | - | Steady State | Calibration in progress | Error | - | Data invalid | - | Over -range | - |
Meaning | toggeles | - | Synchronization error | - | Calibration in progress | Collective error display | - | Input data are invalid | - | Measuring range exceeded | - |
Bit - purpose of the variable “Value (Real)”
Bit position (from left) | 1 | 8 | 23 (+1 “hidden bit”, see IE559) |
Function | Sign | Exponent | Mantissa |
Bit - meaning of the “control word”
Bit | CW.15 - CW.5 | CW.4 | CW.3 | CW.2 | CW.1 | CW.0 |
Name | - | Tare | Sample Mode | Input Freeze | Disable Calibration | Start Calibration |
Meaning | - | starts tare | mode switching (EL3356-0010 and EL3356-0090 only) | stops the measurement | switches the automatic self-calibration off | starts the self-calibration immediately |