Operating instructions

Communication
6.4 Communication via PROFIBUS
Control Units CU240S
Operating Instructions, 06/2007 - SW 3.0, A5E00766042B AB
167
For the acyclic communication in OB1 a read/write request must be send to the drive with RD_REC
(SFC 59) and WR_REC (SFC 58)
Figure 6-13 Acyclic communication for request and response data block in OB1