F01912 — PB/PN: clock cycle synchronous operation sign-of-life failure

In clock cycle synchronous operation the drive and the controller exchange a sign-of-life signal cyclically over PROFIBUS (PB) or PROFINET (PN). The drive watches the controller's sign-of-life and raises F01912 when, in cyclic operation, more errors have occurred than are permitted: The maximum permissible number of errors in the controller sign-of-life (clock synchronous operation) has been exceeded in cyclic operation. How many telegram failures are tolerated is set in p0925. The affected drive object is taken offline with OFF1 — or OFF3 where that is selected — and the message must be acknowledged before the drive will restart. Depending on the drive configuration, the same condition can also be output as an alarm (A) or with no reaction (N); in both of those cases the drive itself takes no action.

• In cyclic clock-synchronous operation the controller sign-of-life over the PB/PN bus has contained more errors than the drive tolerates — the maximum permissible number of errors was exceeded.

1. Check the bus physically: cables, connectors, terminating resistor, shielding and the like.
2. Correct the interconnection of the controller sign-of-life in p2045.
3. Check that the controller is actually sending its sign-of-life correctly — for example, record a trace of STW2.12 ... STW2.15 and use ZSW1.3 as the trigger signal.
4. Check the permissible telegram failure rate in p0925.
5. Check the bus and the controller for utilization — for example, the bus cycle time Tdp may have been set too short.

• p2045 — signal source (CI interconnection) of the PB/PN clock-synchronous controller sign-of-life; correct the sign-of-life interconnection here if it is wired incorrectly in the configuration.
• p0925 — tolerance of the clock-synchronous sign-of-life, i.e. the permissible telegram failure rate; check this value when F01912 occurs.

The fault is acknowledged immediately (acknowledgement class IMMEDIATELY); once it has been acknowledged the drive can be restarted. If the drive is configured to output the same condition only as an alarm (A) or with no reaction (N), the drive neither responds nor requires an acknowledgement.