Data Area

In general, TcCOM objects can contain data areas that can be used by the environment (e.g., by a PLC instance or by the TwinCAT I/O area). For TwinCAT MC3 TcCOM objects, you have a choice of data structures to use via the Data Area tab.

SSI Inputs

Enable (default)

Name

Type

Description

Data Area 1:

Counter Value

UDINT

Meter reading

Data Area 2:

Data error

BIT

SSI Input Error

Data Area 3:

Frame error

BIT

The data frame is incorrect; that is, the data frame was not terminated with a zero (possibly a broken wire in the clock line).

Data Area 4:

Power failure

BIT

A sensor-related error is displayed if the sensor was previously enabled.

Data Area 5:

Sync error

BIT

The synchronization error bit is only required in DC mode. It indicates whether a synchronization error occurred in the previous cycle. This means that a SYNC signal was triggered at the terminal even though no new process data was available.

Data Area 6:

TxPDO state

BIT

This element indicates whether the values measured by the encoder are in an invalid state.

Data Area 7:

TxPDO toggle

BIT

TxPDO Toggle is toggled by the slave when the data for the corresponding TxPDO is updated.

Data Area 8:

WcState

BIT

Working counter

Data Area 9:

InputToggle

BIT

Level change upon receipt of a new telegram.

Data Area 10:

DcInputShift

DINT

Used for dead-time compensation of the drive.