Process data
The EL30xx terminals offer two different process data per analog channel for transmission: the analog value Value (16-bit) and status information Status (16-bit). The transfer of individual status information and individual channels can be disabled in the ProcessData tab. These changes become effective after activation and an EtherCAT restart or a reload.
There is a choice of two types of process data in the EL30xx:
- Standard: standard setting, Value (16-bit) and status information (8 or 16 bit) are transmitted per channel.
- Compact: only the Value (16 bit) is transmitted per channel
The settings are described below, taking the EL3002 (two channels, +/-10 V) as an example. The data apply to TwinCAT 2.11 from build 1544 onward and XML revision from EL30xx-0000-0017 onward.
Interpretation of value & status variable
The plain text display of the bit meanings of the Status word is particularly helpful not only in commissioning but also for linking to the PLC program.
By right-clicking on the Status variable in the configuration tree (A), the structure can be opened for linking (B).
In order to be able to read the bit meanings in plain text in the online display (C), use the button Show Sub Variables
to display all subvariables and the structure contents of the status word, see Fig. Display of the subvariables of the EL3002-0000-0017 from TwinCAT 2.11 build 1544 onwards.
Status word
The status word (SW) is located in the input process image, and is transmitted from terminal to the controller.
Bit | SW.15 | SW.14 | SW.13 | SW.12 | SW.11 | SW.10 | SW.9 | SW.8 |
Name | TxPDO Toggle | TxPDO State | - | - | - | - | - | - |
Bit | SW.7 | SW.6 | SW.5 | SW.4 | SW.3 | SW.2 | SW.1 | SW.0 |
Name | - | ERROR | Limit 2 | Limit 1 | Overrange | Underrange | ||
Key
Bit | Name | Description | |
|---|---|---|---|
SW.15 | TxPDO Toggle | 1bin | Toggles with each new analog process value |
SW.14 | TxPDO State | 1bin | TRUE in the case of an internal error |
SW.6 | ERROR | 1bin | General error bit, is set together with overrange and underrange |
SW.5 | Limit 2 | 1bin | See Limit |
SW.4 | 1bin | ||
SW.3 | Limit 1 | 1bin | See Limit |
SW.2 | 1bin | ||
SW.1 | Overrange | 1bin | Analog input signal lies above the upper permissible threshold for this terminal |
SW.0 | Underrange | 1bin | Analog input signal lies under the lower permissible threshold for this terminal |