BECKHOFF BC3150 - Manual (Page 103)

Safety Instructions
Fieldbus Components 101
Allocated variables
The BX offers a limited number of allocated data
Inputs 2kB, %IB0..2048
Outputs 2 kB, %QB0..2048
Flags 4 kB, %MB0..4095
Task configuration
A maximum of one task is available. A sensible task time should be selected. Adjust the task time to your application
by measuring the required system time (PLC + K-Bus + fieldbus + other).
Retain data
The Bus Terminal Controllers of BCxx50 and BXxx00 series offer up to 2 kB of retain data. Ensure that no (or only
very few) retain data are used in function blocks (see RETAIN data).