Technical data

☞
If ZP bytes need to be transferred together because they form
a logical unit (e.g. a control parameter requiring a word), the
FREE update mode must under no circumstances be
selected. With this mode, there is no guarantee that the ZP
bytes which belong together are actually transferred together.
The receiver (PLC or slave) would then process inconsistent
values.
Essential features of the FREE mode:
➣
Minimum cycle load (corresponds to the cycle load that would occur
simply by plugging in the corresponding input/output modules.
➣
Minimum load on the CP.
➣
Simple programming (single handling block call; HDB SYNCHRON
during start-up).
B8976060/02 Communication with Cyclic I/Os
10 - 9 Volume 1