A01903 — COMM INT: Receive configuration data invalid

A01903 appears when the drive unit refuses the receive configuration data that is being sent to it. The check that rejects the data returns a value, and the drive stores that value in r2124, to be read as a decimal number; it identifies exactly which rule the configuration broke. Depending on how the drive is configured, the same condition can also be signalled as a fault instead of this alarm.

• The drive unit checked the receive configuration data and did not accept it; the alarm value in r2124 records which part of the check failed (values 1 to 5 and 501, decoded below). Any other value is reserved for internal Siemens troubleshooting only.

1. Check the receive configuration data.
2. Alarm value 1 or 2: go through p0978, the list of the drive objects with process data exchange. Note that once an entry p0978[x] = 0, every drive object after it in the list drops out of the process data exchange.
3. Alarm value 2: count the data words for output and input to each drive object, against the indices available in r2050/p2051.
4. Alarm value 501: check the PROFIsafe address set in p9610.

The alarm value stands in r2124, interpreted decimal:

• 1 — a connection was established to more drive objects than the device is configured for. Which drive objects exchange process data, and in which order, is defined in p0978.
• 2 — a drive object is given too many PZD data words for output or input. How many PZD items a drive object can take follows from the number of indices in r2050/p2051.
• 3 — the input or output does not total an even number of bytes.
• 4 — the setting data for synchronization were not accepted; for this case the manual points to A01902.
• 5 — cyclic operation is not active.
• 501 — a PROFIsafe parameter is wrong, for example F_dest.

• r2124 — alarm value; read it as a decimal number, it holds the return value of the receive configuration data check and selects the case.
• p0978 — list of the drive objects (DO) that exchange process data; check it for alarm values 1 and 2.
• r2050 — CO: IF1 PROFIdrive PZD receive word; together with p2051, the number of its indices bounds how many PZD items a drive object can take.
• p2051 — CI: IF1 PROFIdrive PZD send word; see r2050 for alarm value 2.
• p9610 — SI PROFIsafe address of the Control Unit; verify it when the alarm value is 501.

There is no separate reset while the message stands as alarm A01903: correcting the receive configuration data removes the condition. If the drive's configuration raises the same condition as a fault instead, the acknowledgement specified for that variant is IMMEDIATELY.