Restart Coordination - Siemens SIMATIC S7-300 FM 350-1 Manual

Programming the FM 350-1
5.7 Programming FM 350-1 without FCs
5.7.6

Restart coordination

Restart coordination
FM 350-1 always sets the acknowledgement bit FM_NEUST when it performs a restart or
detects a system startup
If you do not use any FCs, coordinate the restart in the user program:
Acknowledge the FM_NEUST bit by setting the NEUSTQ control bit.
FM 350-1 then resets acknowledgement bit FM_NEUST, and sets acknowledgement bit
FM_NEUSTQ.
You can reset control bit NEUSTQ after FM 350-1 has reset acknowledgement bit
FM_NEUST.
The diagram shows the restart coordination sequence.
Figure 5-7
An FC when used will automatically coordinate the restart.
72
Restart sequence
FM 350-1 Counter module
Manual, 05/2011, A5E03648639-01