Siemens SIMATIC S5 Manual page 336

Troubleshooting
Error Code
Recovery Procedures
F55 Erroneous data transfer
F56 Erroneous data transfer
F57 BREAK received
F58 PCB (module) does not answer
F5A Wrong baudrate
F5D Parity error
F5E Overflow error
F5F Frame error
F61 Incorrect hardware limit switch polarity
The only permissible values are "0" (NO contact, positive) and "1"
(NC contact, negative). The IP 266 can detect an invalid parameter value
only when neither hardware limit switch is actuated at the instant at which
the machine data is entered. The hardware limit switches are also evalua-
ted when a rotary axis is used. If none have been connected, NO contacts
must be programmed.
F62 Maximum speed too high for this resolution
When a 5V encoder is used, the counter chip can count pulse trains with a
maximum baud rate of 500 kHz. At the specified maximum speed in con-
junction with the specified resolution [µm/pulse], this value is exceeded.
F66 Invalid range limit value
This error occurs only in conjunction with a rotary axis. The cause of error is
the same as that for error F07.
F68 Invalid dimensional unit
Permissible dimensional units are millimeters, inches and degrees.
10-10
IP 266
Cross-
Reference
Section 5.1.3
EWA 4NEB 812 6057-02