Siemens SIMATIC S5 Manual page 341

IP 266
Error Code
Recovery Procedure
FB2 Invalid position control direction
The encoder's position control direction is checked on an IP 266 cold
restart. If an error is detected, the IP starts mode 4. You must then switch
off the IP 266's 24 V power supply and change the position control
direction (see Section 3.4).
If no error was detected following a positioning operation during which
an analog voltage greater than 5 V was output, the IP 266 deactivates the
position control monitor.
The monitor is reactivated each time mode 4 is started.
FB3 Machining program is active
FB5 Target position not yet reached
The setpoint position is already within the target range. The actual
position is still outside the tolerance range of the zero-speed monitor and
is no longer approaching the target coordinate, and the following error is
lower than the specified maximum. Possible causes:
- The tolerance range of the zero-speed monitor is too small
- The gain factor is too low or
- The power section has too much drift (drift compensation, mode 18)
- The position control loop was interrupted during execution of a
traversing operation, and the distance to go is less than the maximum
following error. If the distance to go is greater, however, "Maximum
following error exceeded" is flagged.
EWA 4NEB 812 6057-02
Troubleshooting
Cross-
Reference
10-15