A35224 — TM: Zero mark synchronization interrupted

The manuals print this alarm as TM: Zero mark synchronization interrupted. It reports that the zero mark synchronization with the encoder to be emulated was interrupted. In this function a Terminal Module 41 (TM41) emulates an encoder whose position setpoint is fed to it via connector input p4420. Why the synchronization stopped is stored as a decimal alarm value in r2124. The alarm is only output if, for an absolute encoder, the zero mark synchronization is set to the zero position (p4401.0 = 1 and p4401.1 = 0). Depending on how the drive is configured, the same condition can also be issued without a drive reaction (N).

• The zero mark synchronization with the encoder to be emulated was interrupted. The concrete event that interrupted it is coded as a decimal alarm value in r2124 (see the decoding below).

1. No remedial action is necessary for this alarm.
2. If the encoder changes into the ready state, a synchronization operation that was previously interrupted is carried out again automatically.
3. If the alarm value in r2124 is 4, the encoder interconnected via connector input p4420 has carried out an EDS changeover or has been re-parameterized; this operation is not supported — set p4420 to 0 and interconnect it again.

• 0: the encoder is not in the ready state (e.g. encoder parked).
• 1: an absolute encoder was connected.
• 2: the encoder whose r0479[0...2] is interconnected via connector input p4420 is already communicating with another TM41 — precisely one TM41 can be interconnected with a specific r0479[0...2].
• 3: the BICO interconnection to Terminal Module 41 (TM41) was removed (CI: p4420 = 0 signal).
• 4: the encoder interconnected via connector input p4420 has carried out an EDS changeover or has been re-parameterized; this operation is not supported — set p4420 to 0 and interconnect again.
• 5: the maximum number of revolutions of the encoder was exceeded.
• 6 and 7: the encoder is in an invalid state.
• 8: the encoder is in an invalid state — the encoder is not parameterized or the interconnected signal source is not in the cyclic state.

• r2124 — alarm value: read it as a decimal number to find out which event interrupted the zero mark synchronization.
• r0479 — diagnostics of the encoder position actual value: the encoder to be emulated is interconnected via its r0479[0...2]; alarm value 2 appears when another TM41 is already communicating with this signal.
• p4420 — CI: TM41 encoder emulation position setpoint: the BICO interconnection that carries the position setpoint of the encoder to be emulated; alarm value 3 means it was removed (p4420 = 0), and for alarm value 4 it is set to 0 and interconnected again.
• p4401 — TM41 encoder emulation mode: the alarm is only output when, for an absolute encoder, p4401.0 = 1 and p4401.1 = 0, i.e. the zero mark synchronization is set to the zero position.

No acknowledgment is necessary and the drive triggers no reaction to this alarm. One limit applies: if the synchronization was interrupted because the maximum permissible synchronization duration was exceeded, the drive does not carry out a new synchronization.