An external error or malfunction deriving from encoder/proximity or its wiring, does
not necessarily involve a change of safety status of the normal output of
the function block. Failures or malfunctions of encoder/proximity switch or its wiring
are then recognized by the module, managed and specified via the diagnostic bit on
every function block
To ensure the safety features the diagnostic bit has to be used in the configuration
program created by the user to cause a possible deactivation of the outputs if the
axis is working. In absence of encoder/proximity external anomalies, bit will be
equal to 0 (zero).
In presence of encoder/proximity external anomalies, error_out bit will be equal
to 1 (one):
- Absence of encoder or proximity.
- Absence of one or more wiring from encoder/proximity.
- Absence of encoder power supply (only model with TTL external power supply).
- Error of congruence frequencies between signals from encoder/proximity.
- Phase error between signals from the encoder or duty cycle error of a single phase.
Figure 54 – Example of speed control functional block with Error Out enabled
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