Fig. 20 Input Data In The Bus Coupler; Fig. 21 Process Image In The Bk5200 And In The Plc (Scanner) - Beckhoff BK5200 Documentation

Fig. 20: Input data in the Bus Coupler
Process image in the BK5200 and in the PLC (scanner)
Fig. 21: Process image in the BK5200 and in the PLC (scanner)
Data consistency
Data whose content is all correctly associated is said to be consistent.
Examples of data items that belong together are
1. the high and low byte of an analog value (word consistency)
2. the control/status byte and the associated parameter word for access to the registers.
Data consistency in the interaction of peripheral devices and their controllers is, in a basic sense, only
assured for a single byte. In other words, the bits of a byte are written or read together. Byte consistency is
sufficient for handling digital signals. Whenever values have a length of more than 8 bits, analog values for
BK52x0 and LC5200 Version: 2.0.0
Parameterization and Commissioning
33