What it means
F08502 is raised when the sign-of-life exchange with the higher-level control system stops arriving: the monitoring time for the sign-of-life counter has expired, and the drive treats the link as broken. The manuals word the broken link in two ways. The PN/COMM BOARD variant (described for SINAMICS S120/S150 and G130/G150) speaks of an interrupted connection to the COMM BOARD, while the PROFINET variant (G120, G120XA) speaks of an interrupted connection to the PROFINET interface. On the G120C and G115D the code appears in the message list simply as Monitoring time sign-of-life expired
. Depending on the drive configuration, the same condition can also be issued as an alarm (A).
Why it appears
- The monitoring time for the sign-of-life counter has expired — the expected sign-of-life did not arrive within the set time.
- The connection to the COMM BOARD was interrupted (stated for the PN/COMM BOARD variant).
- The connection to the PROFINET interface was interrupted (stated for the PROFINET variant on G120 and G120XA).
What to check
- Check the communications link to the higher-level control system.
- Check the COMM BOARD — this is the remedy the manual gives for the PN/COMM BOARD variant.
- On the drives whose manual describes the PROFINET variant, carry out a POWER ON (switch-off/switch-on).
- If the fault occurs again after the POWER ON, contact Technical Support.
Acknowledging and restarting
The fault is acknowledged immediately: it can be cleared as soon as it is displayed, with no waiting period, and the drive can restart once the link to the control system is working again. Where the drive is configured to show the condition as an alarm (A), the manual specifies no reaction and no acknowledgment.
What differs between the drive families
Straight from the manuals' own fields — F08502 is not described identically everywhere.
| Drive family | Reaction | Acknowledge | Message class | Component | Manual |
|---|---|---|---|---|---|
| S120, S150 | Infeed: OFF1 (OFF2) Servo: OFF1 (OFF2, OFF3) Vector: OFF1 (OFF2, OFF3) Hla: OFF1 (OFF2, OFF3) | IMMEDIATELY | Communication error to the higher-level control system (9) | None | SINAMICS S120, S150 List Manual · p. 2918 |
| G130, G150 | Vector: OFF1 (OFF2, OFF3) Infeed: OFF1 (OFF2) | IMMEDIATELY | Communication error to the higher-level control system (9) | None | SINAMICS G130, G150 List Manual · p. 1633 |
| G120 | OFF1 (OFF2, OFF3) | IMMEDIATELY | Communication error to the higher-level control system (9) | — | SINAMICS G120 · p. 898 |
| G120XA | OFF1 (OFF2, OFF3) | IMMEDIATELY | — | — | SINAMICS G120XA PN converter · p. 1148 |
| G120C | — | — | — | — | SINAMICS G120C Converters · p. 386 |
| G115D | — | — | — | — | SINAMICS G115D distributed drive · p. 395 |
The drives this code lives on
F08502 is described for G115D, G120, G120C, G120XA, G130, G150, S120, S150. These are the converters of those families in our catalogue — price on request.
Questions technicians ask
What does fault F08502 mean on a SINAMICS drive?
The monitoring time for the sign-of-life counter has expired: the drive has not received the expected sign-of-life from the higher-level control system and treats the connection to the COMM BOARD or the PROFINET interface as interrupted.
How do I reset fault F08502?
Acknowledge it immediately once it is displayed. On the drives whose manual describes the PROFINET variant, the remedy also includes a POWER ON (switch-off/switch-on); if the fault occurs again after that, contact Technical Support.
Why does F08502 keep coming back?
The code is raised every time the link is interrupted, so a recurring fault points to the communications link or the COMM BOARD — the two items the manual names as objects to check.
Can F08502 also appear as an alarm?
Yes, the same condition can be issued as an alarm (A) depending on the drive configuration; in that form the manual specifies no reaction and no acknowledgment.
Codes next to this one
Source
Written from Siemens' own List Manuals and operating instructions; every number, designation and parameter on this page is checked against them before publication.
All SINAMICS codes: fault and alarm codes · the F08xxx group · SINAMICS manuals · Siemens manuals