Process data
This section describes the individual PDOs and their content. A PDO (Process Data Object) is a unit on cyclically transmitted process values. The individual PDOs can be activated or deactivated separately in the TwinCAT System Manager. The "Process data" tab is used for this (visible only if the terminal is selected on the left). A change in the process data composition in TwinCAT only becomes effective after restarting the EtherCAT system.
The EL6711-0010 can be operated in two CC-Link versions, which differ in the amount of process data they contain
- CC-Link version 1.00 or 1.10 is the first release of CC-Link. In contrast to version 1.00, version 1.10 allows cable lengths of 20 cm between the stations. This version change therefore affects network devices and network cables.
- CC-Link version 2.00 supports 8 times the amount of process data in the system and per station.
The amount of process data created determines the version in which the EL6711-0010 is operated. The version setting can also be fixed to CC-Link version 2, even if the sum of the created process data corresponds to CC-Link version 1. This means that the EL6711-0010 is always available to the master as CC-Link slave version 2 (Index F800, SubIndex 06: Protocol). In addition to the self-configurable process data, the EL6711-0010 also transmits the status PDOI. This status information is transmitted cyclically from the terminal to the EtherCAT master as process data (PDO).
The EL6711-0010 transmits status information in the form of process data:
- TxPDO State: validity of the data of the associated TxPDO (0=valid, 1=invalid).
- Input cycle counter: is incremented with each process data cycle and switches to 0 after its maximum value of 3.
- Status: shows that the configured process data (RWr, RWw, RX, RY) are more, less or equal to the configurable process data. It should be noted that this is not an error message but is for information purposes only.
- 0x0001: more RWw are configured than can be transmitted via CC-Link
- 0x0002: fewer RWw are configured than can be transmitted via CC-Link
- 0x0004: more RWr are configured than can be transmitted via CC-Link
- 0x0008: fewer RWr are configured than can be transmitted via CC-Link
- 0x0010: more RY are configured than can be transmitted via CC-Link
- 0x0020: fewer RY are configured than can be transmitted via CC-Link
- 0x0040: more RX are configured than can be transmitted via CC-Link
- 0x0080: fewer RX are configured than can be transmitted via CC-Link
- 0x0100: invalid CC-Link station address
- 0x0200: CC-Link protocol conflict